Released June 21, 2024

Welcome to Week 7 for the 2024 growing season!  This week includes:
• Weather synopsis
• Grasshoppers
• Wheat midge
• Diamondback moth
• Cereal leaf beetle
• True armyworm
• Cabbage seedpod weevil
• Bertha armyworm
• Monarch migration
• Rare co-emergence of cicada broods
• Welcome Prairie Crop Disease Monitoring Network
• Provincial insect pest report links
• Crop report links
• Previous posts

Catch Monday’s Insect of the Week for Week 7 – What’s eating my crop? Diamondback moth

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Weather synopsis

This week’s weather summary was kindly provided by the Prairie Crop Disease Monitoring Network (PCDMN).

Growing season temperatures have been marginally warmer than average while rainfall amounts continue to be above average. This past week (June 10-16, 2024) temperatures were very similar to climate normal values. The average temperature across the prairies was 14.4 °C (Figure 1). Warmest temperatures were observed across most of Manitoba. Average cumulative seven day rainfall was 29.4 mm. Lowest rainfall values were observed across most of Alberta as well as southern regions of Manitoba and Saskatchewan (Figure 2).

Figure 1. Seven day average temperature (°C) observed across the Canadian prairies for the period of June 10-16, 2024.
Figure 2. Seven day cumulative rainfall (mm) observed across the Canadian prairies for the period of June 10-16, 2024.

Relative to climate normals, average temperatures have been cooler than normal over the past few weeks. The average 30 day temperature (May 18 – June 16, 2024) was 12 °C and was 1°C cooler than the long term average temperature. The warmest temperatures were continue to be south of an area extending from Winnipeg to Saskatoon and southwest to Lethbridge (Figure 3). Most of the prairies have reported 30 day rainfall amounts were normal to above normal. Average cumulative rainfall (mm) over the past 30 days was 78 mm and is 164% of climate normal values. Rainfall amounts were lowest across Alberta (Figure 4). Provincial 30 day values were 60 mm, 77 mm and 120 mm for Alberta, Saskatchewan and Manitoba.

Figure 3. 30 day average temperature (°C) observed across the Canadian prairies for the period of May 18 – June 16, 2024.
Figure 4. 30 day cumulative rainfall (mm) observed across the Canadian prairies for the period of May 18– June 16, 2024.

Since April 1, the 2024 growing season has been 0.5 °C warmer than average. Warmest average temperatures were observed across a region extending from Winnipeg to Saskatoon and southwest to Lethbridge (Figure 5). Growing season rainfall has been above normal across most of the prairies (Figure 6). Only a few, limited, regions have had normal or below normal growing season rainfall (Figure 6 – areas highlighted yellow, orange). Rain amounts have been 191% of climate normals. Cumulative rainfall has been greatest for most of Manitoba and the Parkland region of Saskatchewan (Figure 7).

Figure 5. Growing season average temperature difference from climate normal (°C) observed across the Canadian prairies for the period of April 1 – June 16, 2024.
Figure 6. Growing season percent of normal rain (%) observed across the Canadian prairies from April 1 to June 16, 2024.
Figure 7. Growing season cumulative rainfall (mm) observed across the Canadian prairies for the period of April 1 – June 16, 2024.

Growing degree day (GDD) maps for the Canadian prairies for Base 5 ºC and Base 10 ºC (April 1-June 17 2024) can be viewed by clicking the hyperlinks. Over the past 7 days (to June 19, 2024), the lowest temperatures recorded across the Canadian prairies ranged from < -3 to > 8 °C while the highest temperatures observed ranged from < 12 to >27 °C. In terms of precipitation across the Canadian prairies, review the growing season accumulated precipitation (April 1-June 19, 2024), the growing season percent of average precipitation (April 1-June 19, 2024), and the past 7 days (as of June 19, 2024). Interestingly, northerly areas of the Peace River region in both BC and Alberta are the only areas of the prairies to experience > 1 day of >25 °C weather so far this growing season (April1-June 19, 2024). Access these maps and more using the AAFC Maps of Historic Agroclimate Conditions interface.

Growers can bookmark the AAFC Maps of Current Agroclimate Conditions for the growing season. Historical weather data can be accessed at the AAFC Drought Watch Historical website, Environment and Climate Change Canada’s Historical Data website, or your provincial weather network. The AAFC Canadian Drought Monitor also provides geospatial maps updated monthly.


Nymphs of economically important grasshopper species have been observed at multiple locations in southern Alberta and southern Saskatchewan since mid-May. This week in Saskatchewan, damaging populations of grasshoppers occurred near Kindersley, Rosetown, and Swift Current. Insecticides have been applied to protect seedlings from grasshopper nymphs.

Scout for grasshoppers to keep informed of their developmental stage and population density.

Grasshopper Scouting Tips:
Review grasshopper diversity and photos of nymphs, adults, and non-grasshopper species to aid in-field scouting from egg hatch and onwards.
● It is best to scout on warm days when grasshopper nymphs are more active and easier to observe.
● Carefully check roadside ditches and along field edges but also check the edge of the crop and into the actual field.
● Younger or earlier instar nymphs are easier to manage – visit sites every few days to stay on top of local field conditions.
● A sweep-net can ‘detect’ grasshopper nymphs, however, economic thresholds for grasshoppers are based on the number of grasshoppers per square-metre counts.
● Access the PPMN’s Grasshopper Monitoring Protocol as a guide to help implement in-field monitoring.
● Review grasshopper lifecycle, damage and scouting and economic thresholds to support sound management decisions enabling the preservation of beneficial arthropods and mitigation of economic losses.

Important – A preliminary summary of available thresholds for grasshoppers has been kindly shared by Dr. J. Tansey (Saskatchewan Agriculture) in Table 1. When scouting, compare in-field counts to the available threshold value for the appropriate host crop AND for field or ditch situations. Available thresholds (nominal and economic) help support producers while protecting beneficials (i.e., predators, parasitoids, and pathogens) that regulate natural populations of grasshoppers.

Biological and monitoring information (including tips for scouting and economic thresholds) related to grasshoppers in field crops is posted by Manitoba AgricultureSaskatchewan AgricultureAlberta Agriculture and Irrigation, the BC Ministry of Agriculture, and the Prairie Pest Monitoring Network.  Also, refer to the grasshopper pages within the “Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide” (2018) accessible as a free downloadable PDF in either English or French on our Field Guides page. Review the historical grasshopper maps based on late-summer in-field counts of adults performed across the Canadian prairies.

Wheat midge

Soil moisture conditions in May and June significantly impacts wheat midge emergence. Where wheat midge cocoons are present in soil, the 2024 growing season’s rainfall during May and June will determine if overwintered larvae will terminate diapause then move to the soil surface to pupate. Pupae develop near the soil surface with adults emerging to seek flowering wheat plants.

Although the PPMN is unable to model and predict wheat midge development as in previous years, accumulated precipitation levels during May and June do provide guidance in terms of in-field scouting. Elliott et al. (2009) reported that wheat midge emergence was delayed or erratic if rainfall did not exceed 20-30 mm during May. Olfert et al. (2016) ran model simulations to demonstrate how rainfall impacts wheat midge population density. The Olfert et al. (2020) model indicated that dry conditions may result in: (a) Delayed adult emergence and oviposition, and (b) Reduced numbers of adults and eggs.

In 2024, the accumulated precipitation levels over past 30 days (May 11 to June 9, 2024) were mapped in Figure 1 and ranged from 15-135 mm across the prairies. Areas in Figure 1 receiving substantial rainfall this spring need to plan to scout for wheat midge now as adults typically emerge and seek wheat in late June and early July. In contrast, midge emergence may be delayed or erratic where rainfall fails to exceed 20-30 mm during May and June.

Figure 1. 30 day cumulative rainfall (mm) observed across the Canadian prairies for the period of May 11-June 9, 2024.

Remember – the rate of development and timing of adult midge emergence varies at the field level and can only be verified through in-field scouting. Midge flight coinciding with the beginning of anthesis is a crucial point when in-field counts of wheat midge on plants are carefully compared to the economic thresholds.

Soil core sampling to assess the densities of larvae were collected across Saskatchewan and Alberta post-harvest in 2023 (Fig. 2). Fields where cultivars that are susceptible to wheat midge were grown were targeted so densities of overwintering larvae (and respective parasitism) could be determined to help estimate risk for 2024. Although the 2023 survey found relatively low densities of wheat midge in most sampled fields, be mindful – wheat midge larval cocoons can survive for several years in the soil, waiting for wet spring conditions.

This means, producers opting to grow cultivars that are susceptible to wheat midge need to be mindful that any historically elevated density of wheat midge occurring over the past one or even possibly six years across the prairies that also has received substantial rainfall since May of 2024, warrants in-field monitoring now. Review the past wheat midge maps here in relation to your fields THEN compare the historical densities to areas of high precipitation in Figure 1.

Figure 2. Wheat midge larval cocoon densities in fields planted to wheat in 2023 estimated using soil core sampling performed post-harvest. Notes: (a) Samples were not collected from non-wheat fields; (b) In southern Alberta, only irrigated fields were sampled south of Highway 1 due to extreme dry conditions.

In-Field Monitoring: When scouting wheat fields, pay attention to the synchrony between flying midge and anthesis.  

In-field monitoring for wheat midge should be carried out in the evening (preferably after 8:30 pm or later) when the female midges are most active. On warm (at least 15 ºC), calm evenings, the midge can be observed in the field, laying their eggs on the wheat heads (Fig. 3). Midge populations can be estimated by counting the number of adults present on 4 or 5 wheat heads. Inspect the field daily in at least 3 or 4 locations during the evening.

Figure 3. Wheat midge (Sitodiplosis mosellana) laying their eggs on a wheat head. Photo: AAFC-Beav-S. Dufton and A. Jorgensen.
Figure 4. Macroglenes penetrans, a parasitoid wasp that attacks wheat midge, measures only ~2 mm long.  Photo: AAFC-Beav-S. Dufton.

REMEMBER that in-field counts of wheat midge per head remain the basis of the economic threshold decision.  Also remember that the parasitoid, Macroglenes penetrans (Fig. 4), is actively searching for wheat midge at the same time.  Preserve this parasitoid whenever possible and remember insecticide control options for wheat midge also kill these beneficial insects who help reduce midge populations.

Economic Thresholds for Wheat Midge:
a) To maintain optimum No. 1 grade: 1 adult midge per 8 to 10 wheat heads during the susceptible stage.
b) To maintain yield only: 1 adult midge per 4 to 5 heads. At this level of infestation, wheat yields will be reduced by approximately 15% if the midge is not controlled.
Inspect the developing kernels for the presence of larvae and larval damage.

Wheat midge was featured as the Insect of the Week in 2023 (for Wk08). Be sure to also review wheat midge and its doppelganger, the lauxanid fly, featured as the Insect of the Week in 2019 (for Wk11) – find descriptions and photos to help with in-field scouting!  Additionally, the differences between midges and parasitoid wasps were featured as the Insect of the Week in 2019 (for Wk12).  Remember – not all flying insects are mosquitoes nor are they pests! Many are important parasitoid wasps that regulate insect pest species in our field crops OR pollinators that perform valuable ecosystem services!

Information related to wheat midge biology and monitoring can be accessed by linking to your provincial fact sheet (Saskatchewan Ministry of Agriculture or Alberta Agriculture & Irrigation).  Alberta Agriculture & Irrigation has a YouTube video describing in-field monitoring for wheat midge.  

Additional information can be accessed by reviewing the Wheat midge pages extracted from the “Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and Field Guide” (2018) accessible as a free downloadable PDF in either English or French on our new Field Guides page.

Diamondback moth

Diamondback moths (DBM; Plutella xylostella) are a migratory invasive species. Each spring adult populations migrate northward to the Canadian prairies on wind currents from infested regions in the southern or western U.S.A. Upon arrival to the prairies, migrant diamondback moths begin to reproduce and this results in subsequent non-migrant populations that may have three or four generations during the growing season.

The week of May 27, 2024, very mature larvae were retrieved in flixweed in southern Alberta (Barkley, pers. comm. 2024). Thus, a second generation of adult diamondback moth is likely active in southern parts of the prairies.

Pheromone-baited Delta traps housing sticky cards are used to monitor diamondback moth across the Canadian prairies. Research has shown that cumulative counts > 25 moths indicate elevated risk. In those areas, it then becomes important to scout and assess larval densities.

Please refer to this week’s Provincial Insect Pest Report Links to find the most up-to-date information summarizing weekly cumulative counts compiled by provincial pheromone trapping networks across the Canadian prairies in 2024.

Scouting and pest management for diamondback moth depends on in-field counts of larvae per metre2! This means plants need to be pulled and tapped off to assess the number of larvae! Use Figure 1 below to help identify the different stages of diamondback moth.

Figure 1. The life stages of the diamondback moth (Plutella xylostella), which can have multiple generations per year. Photos: AAFC-Saskatoon-J. Williams.

Biological and monitoring information for DBM (including tips for scouting and economic thresholds) is posted by Manitoba AgricultureSaskatchewan Agriculture, and the Prairie Pest Monitoring Network.  Also, refer to the diamondback moth pages within the “Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide” (2018) accessible as a free downloadable PDF in either English or French on our Field Guides page.

Cereal leaf beetle

The cereal leaf beetle (Chrysomelidae: Oulema melanopus) has a broad host range. Wheat is the preferred host, but adults and larvae also feed on leaf tissue of oats, barley, corn, rye, triticale, reed canarygrass, ryegrass, fescue, wild oats, millet and other grasses. Yield quality and quantity is decreased, if the flag leaf is stripped. Fun fact: Cereal leaf beetle larvae carry their own fecal waste above their body to help protect themselves from predators.

Fortunately, the parasitoid wasp, Tetrastichus julis Walker (Hymenoptera: Eulophidae), is an important natural enemy of cereal leaf beetle larvae. Learn more about this beneficial insect species featured in Week 9 of 2023’s Insect of the Week!

Cereal Leaf Beetle Lifecycle and Damage:

Adult: Adult cereal leaf beetles (CLB) have shiny bluish-black wing covers (Fig. 1). The thorax and legs are light orange-brown. Females (4.9 to 5.5 mm) are slightly larger than males (4.4 to 5 mm). Adult beetles overwinter in and along the margins of grain fields in protected places such as in straw stubble, under crop and leaf litter, and in the crevices of tree bark. They favour sites adjacent to shelterbelts, deciduous and conifer forests. They emerge in the spring once temperatures reach 10-15 ºC and the adults are active for about 6 weeks. They usually begin feeding on grasses, then move into winter cereals and later into spring cereals.  

Figure 1. Adult Oulema melanopus measure 4.4-5.5 mm long (Photo: M. Dolinski).

Egg: Eggs are laid approximately 14 days following the emergence of the adults. Eggs are laid singly or in pairs along the midvein on the upper side of the leaf and are cylindrical, measuring 0.9 mm by 0.4 mm, and yellowish in colour. Eggs darken to black just before hatching.  

Larva: The larvae hatch in about 5 days and feed for about 3 weeks, passing through 4 growth stages (instars). The head and legs are brownish-black; the body is yellowish. Larvae are usually covered with a secretion of mucus and fecal material, giving them a shiny black, wet appearance (Fig. 2).  When the larva completes its growth, it drops to the ground and pupates in the soil. 

Figure 2.  Larval stage of Oulema melanopus with characteristic feeding damage visible on leaf (Photo: M. Dolinski).

Pupa: Pupal colour varies from a bright yellow when it is first formed, to the colour of the adult just before emergence. The pupal stage lasts 2 – 3 weeks. Adult beetles emerge and feed for a couple of weeks before seeking overwintering sites. There is one generation per year.

Access scouting tips for cereal leaf beetle or find more detailed information by accessing the Oulema melanopus page from the “Field crop and forage pests and their natural enemies in western Canada – Identification and management field guide” (2018; accessible as a free downloadable PDF in either English or French on our new Field Guides page.

True armyworm

Similar to diamondback moth, the true armyworm, or just armyworm (Mythimna unipuncta or Pseudaletia unipunctata) is a migratory pest in Canada. After arriving from the United States, true armyworm can have two generations of larvae before cool temperatures in the fall stop their development. True armyworm caterpillars feed along leaf margins of their hosts, leaving damage that could be misdiagnosed as grasshopper or bertha armyworm damage. Preferred hosts include native grasses, wheat, rye, corn, oats, and barley. Other hosts can include crucifer vegetables (e.g., cabbage) and alfalfa.

Phermone traps have been deployed by the Saskatchewan Ministry of Agriculture and Manitoba Agriculture and by their collaborators and volunteers in both provinces to detect the arrival of immigrating true armyworm. In Saskatchewan, true armyworm have been caught by pheromone traps in the northeast and central parts of the province. In Manitoba, true armyworm have been caught in the central, eastern, and Interlake regions.

The economic threshold for true armyworm larvae in cereals is 10 larvae/m2. If scouting in the evening or at night, beat plants in a 1 m2 area and count the dislodged larvae. True armyworm larvae are more likely to be on the ground during the day, so look under leaf litter and other debris around the plants in a 1 m2 area and count the larvae. For more information and tips for scouting, refer to the armyworm pages of the “Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide” (2018) accessible as a free downloadable PDF in either English or French on our new Field Guides page OR access Manitoba Agriculture’s scouting guide.

Cabbage seedpod weevil

There is one generation of cabbage seedpod weevil (CSPW; Ceutorhynchus obstrictus) per year. The overwintered adult is an ash-grey weevil measuring 3-4mm long (e.g., lower left photo).  Mating and oviposition are quickly followed by eggs hatching within developing canola pods (e.g., lower right photo). The highly concealed larvae feed within the pod, consuming the developing seeds.

Damage: Adult feeding damage to buds is more evident in dry years when canola is unable to compensate for bud loss.  Adults mate following a pollen meal then the female will deposit a single egg through the wall of a developing pod or adjacent to a developing seed within the pod (refer to lower right photo).  Eggs are oval and an opaque white, each measuring ~1mm long.  Typically a single egg is laid per pod although, when CSPW densities are high, two or more eggs may be laid per pod.

There are four larval instar stages of the CSPW and each stage is white and grub-like in appearance ranging up to 5-6mm in length (refer to lower left photo).  The first instar larva feeds on the cuticle on the outside of the pod while the second instar larva bores into the pod, feeding on the developing seeds.  A single larva consumes about 5 canola seeds.  The mature larva chews a small, circular exit hole from which it drops to the soil surface and pupation takes place in the soil within an earthen cell.  Approximately 10 days later, the new adult emerges to feed on maturing canola pods.  Later in the season, these new adults migrate to overwintering sites beyond the field.


  • Begin sampling when the crop first enters the bud stage and continue through the flowering. 
  • Sweep-net samples should be taken at ten locations within the field with ten 180° sweeps per location.  
  • Count the number of weevils at each location. Samples should be taken in the field perimeter as well as throughout the field.  
  • Adults will invade fields from the margins and if infestations are high in the borders, application of an insecticide to the field margins may be effective in reducing the population to levels below which economic injury will occur.  
  • An insecticide application is recommended when three to four weevils per sweep are collected and has been shown to be the most effective when canola is in the 10 to 20% bloom stage (2-4 days after flowering starts). 
  • Consider making insecticide applications late in the day to reduce the impact on pollinators.  Whenever possible, provide advanced warning of intended insecticide applications to commercial beekeepers operating in the vicinity to help protect foraging pollinators.  
  • High numbers of adults in the fall may indicate the potential for economic infestations the following spring.

Albertan growers can report and check the live map for CSPW posted by Alberta Agriculture and Forestry (screenshot provided below as an example; retrieved 2022Jul28).

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Please find additional detailed information for CSPW in fact sheets posted by Alberta Agriculture and IrrigationSaskatchewan Agriculture, or the Prairie Pest Monitoring Network.  Also refer to the cabbage seedpod weevil pages within the “Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide” (2018) accessible as a free downloadable PDF in either English or French on our new Field Guides page. The Canola Council of Canada’s “Canola Encyclopedia” also summarizes CSPW.

Bertha armyworm

Pheromone traps used to monitor bertha armyworm are typically set up along canola fields when pupal development reaches 75-80%; the 2024 monitoring season started the week of June 10, 2024.

Use the images below (Fig. 1) to help identify moths from the by-catch that will be retained in the green phermone-baited unitraps.

Figure 1. Stages of bertha armyworm from egg (A), larva (B), pupa (C), to adult (D). Photos: J. Williams (Agriculture and Agri-Food Canada).

Refer to the PPMN Bertha armyworm monitoring protocol for help when performing in-field scouting or review the 2019 Insect of the Week which featured bertha armyworm and its doppelganger, the clover cutworm! 

Please refer to this week’s Provincial Insect Pest Report Links to find the most up-to-date information summarizing weekly cumulative counts compiled by provincial pheromone trapping networks across the Canadian prairies in 2024.

Biological and monitoring information related to bertha armyworm in field crops is posted by the provinces of ManitobaSaskatchewanAlberta and the Prairie Pest Monitoring Network. Also, refer to the bertha armyworm pages within the “Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide” (2018) accessible as a free downloadable PDF in either English or French on our new Field Guides page.

Monarch migration

Track the migration of the Monarch butterflies as they move north by checking the 2024 Monarch Migration Map!  A screenshot of Journey North’s “first sightings of adults” map has been placed below as an example (retrieved 18Jun2024) but follow the hyperlink to check the interactive map.  They’ve reached Manitoba, Saskatchewan, and (like the Stanley Cup) we look forward to welcoming them back to Alberta!

Access this Post to help you differentiate between Monarchs and Painted Lady Butterflies!

Visit the Journey North website to learn more about migration events in North America and visit their monarch butterfly website for more information related to this amazing insect. 

Rare co-emergence of cicada broods

Two broods, Brood XIX and Brood XIII, live in different regions and began to emerge in the United States in May 2024.

Watch Time’s 2-minute YouTube to find out why 2024 was special for cicadas in North America.

Find out more about periodical cicadas at the University of Connecticut’s website linked to Dr. John R. Cooley‘s MagiCicada Project. Unfortunately, Canadians are not projected to see tremendous cicada emergence this year. However, quoting directly from the University of Connecticut’s website, “2024 is a special year for periodical cicadas:
• For the first time since 2015 a 13-year brood will emerge in the same year as a 17-year brood.
• For the first time since 1998 adjacent 13-and 17-year broods will emerge in the same year.
• For the first time since 1803 Brood XIX and XIII will co-emerge.
• You will be able to see all seven named periodical cicada species as adults in the same year, which will not happen again until 2037. You will not see all seven named species emerge in the state of Illinois again until 2041.”

Welcome Prairie Crop Disease Monitoring Network

This week, the Prairie Pest Monitoring Network is excited to promote the official launch of the Prairie Crop Disease Monitoring Network’s official website,!

The Prairie Crop Disease Monitoring Network (PCDMN) launched a new website today at The PCDMN is a coordinated field crop disease monitoring program for the Prairies, focusing on providing timely information about crop diseases and highlighting effective disease management strategies.

“We are really excited to be launching this new website,” said project lead Dr. Kelly Turkington, Plant Pathologist at Agriculture and Agri-Food Canada, Lacombe Research and Development Centre. “The goal of the network has always been to provide important and timely information to growers and agronomists. By enhancing the functionality of our PCDMN Blog, this new website will greatly improve our communication and engagement, ensuring that stakeholders have access to the latest research and disease management strategies.”

The PCDMN is composed of field crop pathologists who conduct research and actively monitor field crop diseases on the Canadian Prairies. The network includes researchers from Agriculture and Agri-Food Canada, Manitoba Agriculture, Saskatchewan Ministry of Agriculture, Alberta Agriculture & Irrigation, and Prairie-based universities.

“The PCDMN is a valuable resource for farmers, agronomists, and scientists,” says Wayne Thompson, Executive Director of the Western Grains Research Foundation (WGRF). “We are proud to have funded the development of this new website. With this launch, WGRF has successfully developed websites for the three major pest monitoring networks in Western Canada—Insects, Weeds, and Disease. These networks play a crucial role in providing the information needed to anticipate and manage major crop threats.”

The PCDMN also provides weekly updates via email during the growing season. The updates alert subscribers to crop disease risks and management. To view the new site and to sign up for weekly updates please visit

Many other organizations have been involved over the years to support this valuable initiative with the 2023-2028 funders including Agriculture and Agri-Food Canada, WGRF, Alberta Canola, Alberta Grains, Alberta Innovates, Manitoba Crop Alliance, Manitoba Pulse and Soybean Growers, Manitoba Canola Growers, Prairie Oat Growers Association, RDAR, Sask Canola, Saskatchewan Ministry of Agriculture, Saskatchewan Pulse Growers, and the Saskatchewan Wheat Development Commission.

Provincial insect pest report links

Prairie-wide provincial entomologists provide insect pest updates throughout the growing season. Follow the hyperlinks to readily access their information as the growing season progresses:

MANITOBA’S Crop Pest Updates for 2024 are available. Access the online June 20, 2024 report (or PDF copy). Bookmark the insect pest homepage to access fact sheets and more! Highlights pulled from the latest report include:
Flea beetles in MB – Dr. J. Gavloski reported that, “flea beetles continue to be of concern” with “foliar insecticide applications in all agricultural regions to some degree”.
Cutworms in MB – “Cutworms continue to be found, however, they are becoming less of an issue in some regions as we get into late-June”.
Diamondback moth pheromone trap monitoring in MB – Reports “increased levels of moths in (pheromone) traps in the Central, Eastern and Interlake regions during the weeks of June 2-8 and June 9-15. Moths were present “in 75 out of 92 traps” and that, “trap counts have generally been low so far in the Northwest and Southwest regions” but “some moderate counts have occurred in the Eastern, Central, and Interlake regions”. The highest cumulative trap count so far is 210 from a trap near Stead in the Eastern region.”
True armyworm in MB – “An increase in moths in the true armyworm (pheromone) traps in recent weeks, particularly in the Eastern, Interlake and Central regions. “The highest cumulative count is 411, from a trap near Dencross in the Eastern region” and “there are areas in the Central, Eastern, and Interlake regions where cereals and forage grasses would be good to prioritize” for armyworm larvae.

SASKATCHEWAN’S Crop Production News is back for the 2024 growing season! Access the online Issue #3 report. Bookmark their insect pest homepage to access important information! Highlights pulled from the latest report include:
Insect pests to watch in SK – “Some areas are seeing crop damage from insects including flea beetles, cutworms and grasshoppers”. The summary also advises that, “some insecticides are being sprayed in different areas of the province for these pests. Scout your fields regularly for potential insect damage and make insecticide decisions based on economic thresholds outlined in the 2024 Guide to Crop Protection or by calling the Agriculture Knowledge Centre at 1-866-457-2377”.
Grasshopper nymphs in SK – “Grasshopper activity is high in areas around Swift Current, Aberdeen, Rosetown, Outlook, and Strasbourg.”
Lambda-cyhalothrin products – An important reminder that, “When evaluating insecticide options for fields, keep in mind lambda-cyhalothrin products have application restrictions. Lambda-cyhalothrin products cannot be applied to any crops used for animal feed in any way or that are grazed by livestock. Learn more about lambda-cyhalothrin restrictions in this issue.
Diamondback moth in SK Preliminary cumulative count data from pheromone traps across the province can now be reviewed online.
• Also access the Crops Blog Posts that announced registration for the Crop Diagnostic School 2024 but also posts help for scouting fields for wireworms (May 2024), grasshopper identification: pest or not (Apr 2024), a summary of wheat midge populations and management (Mar 2024), and a description of pea leaf weevil populations (Feb 2024).

ALBERTA’S Insect Pest Monitoring Network webpage links to insect survey maps, live feed maps, insect trap set-up videos, and more. There is also a Major Crops Insect webpage. Remember, AAF’s Agri-News occasionally includes insect-related information, e.g., scout for grasshoppers and other insect pests (June 17, 2024); how to manage stem feeding from flea beetles, keep canola bins malathion-free, scout for grasshoppers and other pests (June 10, 2024); scout for insect pests (June 3, 2024), scout for grasshoppers (May 27, 2024), flea beetle control (May 6, 2024); cereal insect pests, latest on insects in canola, and post-emergence wireworm scouting (May 13, 2024).
Bertha armyworm pheromone trap monitoring update for AB – Cumulative counts arising from weekly data are available so refer to the Live Map. So far, cumulative trap counts from 90 trap locations are all reporting “low risk” category as of June 20, 2024).
Diamondback moth pheromone trap monitoring update for AB – Cumulative counts arising from weekly data are available so refer to the Live Map. So far, cumulative trap counts have been recorded from 32 reporting sites and 28 remain in the “no risk” category as of June 20, 2024). Four trap locations have caught > 25 adult diamondback moths; sites fall within the County of Grande Prairie (as of June 8, 2024), County of Warner (as of June 15, 2024), Vulcan County (as of June 15, 2024), and County of Barrhead (as of June 15, 2024).
Cutworm live monitoring map for AB – Cumulative counts arising from weekly data are available so refer to the Live Map. So far, 10 surveyed sites have reported from across the province, nine falling within southern Alberta and one report from the County of Grande Prairie.

Crop report links

Access the latest provincial crop reports produced by:
Manitoba Agriculture (subscribe to receive OR access a PDF copy of the June 18, 2024 report).
Saskatchewan Agriculture (or access a PDF copy of the June 11-17, 2024 report).
Alberta Agriculture and Irrigation (or access a PDF copy of the June 11, 2024 abbreviated report).

The following crop reports are also available:
• The United States Department of Agriculture (USDA) produces a Crop Progress Report (access a PDF copy of the June 17, 2024 edition).
• The USDA’s Weekly Weather and Crop Bulletin (access a PDF copy of the June 18, 2024 edition).

Previous posts

As the growing season progresses, the Weekly Update topics move on and off the priority list for in-field scouting. It remains useful to keep the list at hand to support season-long monitoring. Click to review these earlier 2024 Posts (organized alphabetically):
2023 Risk maps
Alfalfa weevil (Wk 02)
Crop production guide links (Wk 03)
Cutworms (Wk 05)
Field heroes (Wk 05)
Flea beetles (Wk 04)
Invasive insects (Wk 06)
Pea leaf weevil (Wk 05)
Priaire Weed Monitoring Network (Wk 06)
Scouting charts – canola and flax (Wk 03 of 2022)
Tick tips (Wk 04)
Wind trajectory summaries unavailable (Wk 01)