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Ross Weiss, Tamara Rounce, David Giffen, Jennifer Otani and Meghan Vankosky
Categories
Week 6
TEMPERATURE: The 2022 growing season has been cooler than normal. Rainfall has been below normal for Alberta and western Saskatchewan while rainfall amounts have been well above normal for eastern Saskatchewan and Manitoba. This past week (June 6-12, 2022) average daily temperatures were generally warmer than in the previous week. The warmest conditions occurred across southern Manitoba, a region extending from Regina to Saskatoon and southwest to Lethbridge, and in the northern Peace River region (Fig. 1). The average temperature across the prairies was 2 °C warmer than normal.
Figure 1. Seven-day average temperature (°C) across the Canadian prairies for the period of June 6-12, 2022.
Though the prairie-wide average 30-day temperature (May 14 – June 12, 2022) was similar to the long-term average value, the average was 1.5 °C warmer than the previous week. Average temperatures have increased across most of the prairies (Fig. 2).
Figure 2. 30-day average temperature (°C) across the Canadian prairies for the period of May 14-June 12, 2022.
The prairie-wide average growing season (April 1-June 12, 2022) temperature was 1 °C warmer than last week; the average growing season temperature for the prairies has been 1 °C cooler than climate normal values. The growing season continues to be cooler in Manitoba than Saskatchewan and Alberta (Fig. 3).
The growing season (April 1 – June 5, 2022) has been cooler in Manitoba than in Saskatchewan and Alberta (Fig. 4; Table 1). The average growing season temperature for the prairies has been 1.5 °C cooler than climate normal values.
Figure 3. Growing season average temperature (°C) observed across the Canadian prairies for the period of April 1 to June 12, 2022.
PRECIPITATION: Seven-day cumulative rainfall ranged between 0 and 42 mm across the prairies, with highest rainfall amounts (20-40 mm) occurring in a region extending from Hanna to Calgary and south to Lethbridge (Fig. 4). Rainfall amounts were generally less than 10 mm for most of Saskatchewan.
Figure 4 Seven-day cumulative rainfall (mm) observed across the Canadian prairies for the period of June 6-12, 2022.
30-day accumulation amounts have been well above average across Manitoba but well below normal across southern and western Saskatchewan (Fig. 5). Growing season rainfall for April 1 – June 12, 2022, continues to be greatest across Manitoba and eastern Saskatchewan; rain amounts have been below normal across most of western Saskatchewan and Alberta (Fig. 6).
Figure 5. 30-day cumulative rainfall (mm) observed across the Canadian prairies the past 30 days (May 14-June 12, 2022).Figure 6. Growing season cumulative rainfall (mm) observed across the Canadian prairies for the period of April 1 to June 12, 2022.
Ross Weiss, Tamara Rounce, David Giffen, Owen Olfert, Jennifer Otani and Meghan Vankosky
Categories
Week 6
The grasshopper (Acrididae: Melanoplus sanguinipes) model predicts development using biological parameters known for the pest species and environmental data observed across the Canadian prairies on a daily basis. Review lifecycle and damage information for this pest. Review the historical grasshopper maps based on late-summer adult in-field counts performed across the prairies.
Model simulations were used to estimate percent grasshopper egg development and hatch as of June 12, 2022. Warmer temperatures over the past 30 days have resulted in increased rates of grasshopper development across Saskatchewan and Alberta; wetter/cooler conditions across eastern Saskatchewan and Manitoba have resulted in delayed development.
Last week, average embryological development was 76 %. This week, average egg development is predicted to be 83 % and is 1 % greater than the long-term development rate. Hatch is progressing across southern and central regions of Alberta and Saskatchewan with hatch rates that range between 15 and 60% (Fig. 1). First to third instar nymphs should be occurring across southern and central regions of Alberta and Saskatchewan. Simulations indicate that 5-10% of the population has hatched across southern and central regions of Manitoba.
Figure 1. Predicted grasshopper (Melanoplus sanguinipes) embryological development (%) across the Canadian prairies as of June 12, 2022.
Risk estimates, based on meteorological inputs, were used to assess the impact of weather on grasshopper development and population growth potential (Fig. 2). Grasshopper risk is greatest in areas that are warmer and drier than normal. As of June 12, 2022, model output indicates that potential risk is greatest across a region that extends from Lethbridge to Swift Current and Saskatoon. Relative to last week,risk has increased for localized areas across the Peace River region. The simulation indicates that even though temperatures are suitable for grasshopper development, excessive moisture across most of Manitoba has reduced the potential risk from grasshoppers. Overall risk is predicted to be similar to long-term average risk and is currently well below potential risk predictions that were produced for the 2021 growing season.
Figure 2. Predicted risk for the migratory grasshopper (Melanoplus sanguinipes) across the Canadian prairies as of June 12, 2022.
Ross Weiss, Tamara Rounce, David Giffen, Julie Soroka, Owen Olfert, Jennifer Otani and Meghan Vankosky
Categories
Week 6
The alfalfa weevil (AAW) (Curculionidae: Hypera postica) model predicts development using biological parameters known for the pest species and environmental data observed across the Canadian prairies on a daily basis. Review lifecycle and damage information for this pest.
Model simulations for alfalfa weevil (AAW) indicate third instar larvae should now be appearing across the prairies. Development is similar to long-term average values. AAW development in central Saskatchewan (Fig. 1) is slower than AAW development in southern Alberta (Fig. 2).
Figure 1. Predicted status of alfalfa weevil (Hypera postica) populations near Saskatoon SK as of June 12, 2022.Figure 2. Predicted status of alfalfa weevil (Hypera postica) populations near Medicine Hat AB as of June 12, 2022.
Additional information can be accessed by reviewing the Alfalfa Weevil Page extracted 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.
Jennifer Otani, Ross Weiss, Tamara Rounce, David Giffen, Owen Olfert and Meghan Vankosky
Categories
Week 6
The cereal leaf beetle (CLB) (Chysomelidae: Oulema melanopus) model predicts larval development using biological parameters known for the pest species and environmental data observed across the Canadian prairies on a daily basis. Review lifecycle and damage information for this pest.
Warmer conditions in southern Alberta and western Saskatchewan are predicted to result in more rapid development of cereal leaf beetle (CLB) populations in those regions than in southern Manitoba. CLB model output predicts that hatch should be nearly complete for southern Alberta and western Saskatchewan. First to third instar larvae are predicted to be present in these areas (Fig. 1). As a result of cooler conditions, the model predicts that egg development has been delayed in southern Manitoba; first instar and second instar larvae may be appearing this week (Fig. 2).
Figure 1. Predicted status of cereal leaf beetle (Oulema melanopus) populations near Lethbridge AB as of June 12, 2022.Figure 2. Predicted status of cereal leaf beetle (Oulema melanopus) populations near Winnipeg MB as of June 512 2022.
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.
Jennifer Otani, Ross Weiss, Tamara Rounce, David Giffen, Owen Olfert and Meghan Vankosky
Categories
Week 6
Pupal development of bertha armyworm (BAW) is progressing across the prairies with the most rapid development occurring across southern and central regions of Alberta and western Saskatchewan (Fig. 1). Over the next week, adults should be emerging across Alberta, Saskatchewan and localized areas in southern Manitoba.
Figure 1. Predicted bertha armyworm (Mamestra configurata) pupal development (%) across the Canadian prairies as of June 12, 2022.
Use the images below (Fig. 2) to help identify moths from the by-catch that will be retained in the green phermone-baited unitraps.
Figure 2. Stages of bertha armyworm from egg (A), larva (B), pupa (C) to adult (D). Photos: J. Williams (Agriculture and Agri-Food Canada)
Biological and monitoring information related to bertha armyworm in field crops is posted by the provinces of Manitoba, Saskatchewan, Alberta 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.
Ross Weiss, Tamara Rounce, David Giffen, Owen Olfert, Jennifer Otani and Meghan Vankosky
Categories
Week 6
Wheat midge (Sitodiplosis mosellana) overwinter as larval cocoons in the soil but soil moisture conditions in May and June largely determine whether or not the larva exits their cocoon to move to the soil surface to continue development (i.e., to pupate then emerge as a midge this season). Adequate rainfall promotes termination of diapause and movement of larvae to the soil surface where pupation occurs. Insufficient rainfall in May and June can result in delayed movement of larvae to the soil surface. Wheat midge emergence may be delayed or erratic if rainfall does not exceed 20-30 mm during May. The Olfert et al. (2020) model indicated that dry conditions may result in: a. Delayed adult emergence and oviposition b. Reduced numbers of adults and eggs
Compared to last week, the wheat midge model indicates that the development of larval populations has advanced considerably across the eastern prairies and Peace River region. Normal to above-normal rain in Manitoba, eastern Saskatchewan and the Peace River region should be sufficient to promote the movement of wheat midge larvae to the soil surface (Fig. 1). Insufficient rainfall across central Alberta and western Saskatchewan will limit the development of larval populations that are in the soil.
Wheat midge simulations suggest that greater than 60 % of the larval population has moved to the soil surface in some areas of the prairies. Larval populations should begin to transition to the pupal stage over the next seven days. Current development for eastern Saskatchewan and Manitoba is similar to long-term average rates.
Figure 1. Percent of wheat midge larval population (Sitodiplosis mosellana) that has moved to the soil surface across western Canada,as of June 12, 2022.
Risk estimates, based on meteorological inputs, were used to assess the impact of weather on wheat midge development and potential population growth potential (Fig. 2). Wheat midge risk is greatest in areas that have received normal to above-normal rainfall. As of June 12, 2022, model output indicates that potential risk is greatest across eastern Saskatchewan and Manitoba. Risk in these areas is predicted to be similar to long-term average risk.
Figure 2. Predicted risk for wheat midge (Sitodiplosis mosellana) outbreaks across the Canadian prairies as of June 12, 2022.
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.
1. REVERSE TRAJECTORIES (RT) Since May 1, 2022, the majority of reverse trajectories that have crossed the prairies originated from the Pacific Northwest (Idaho, Oregon and Washington) (Fig. 1). This past week (June 7-13, 2022) the number of reverse trajectories originating from Mexico, California, Texas, Oklahoma, Nebraska and Kansas continued to be low. This week reverse trajectories generally originated over the Pacific Ocean before entering the prairies.
Figure 1. Average number (based on a 5-day running average) of reverse trajectories (RT) crossing the prairies for the period of June 1-13, 2022.
a. Pacific Northwest (Idaho, Oregon, Washington) – The majority of Pacific Northwest reverse trajectories have been reported to pass over southern and central Alberta and western Saskatchewan (Fig. 2). This past week (June 7-13, 2022) the ECCC model predicted that 134 reverse trajectories would cross the prairies. This is a significant increase over the previous week (n=26).
Figure 2. Total number of dates with reverse trajectories originating over the Idaho, Oregon, and Washington that have crossed the prairies between April 1 and June 13, 2022.
b. Mexico and southwest USA (Texas, California) – This past week (June 7-13, 2022) the model reported that zero reverse trajectories that originated from Mexico, California or Texas crossed over the Canadian prairies. Since May 1, 2022, these trajectories have been restricted to Manitoba and eastern Saskatchewan (Fig. 3).
Figure 3. The total number of dates with reverse trajectories originating over Mexico, California and Texas that have crossed the prairies between April 1 and June 13, 2022.
c. Oklahoma and Texas – Since April 1, reverse trajectories were reported for Manitoba and eastern Saskatchewan. This past week (June 7-13, 2022) one trajectory crossed over Edmonton, Alberta.
Figure 4. The total number of dates with reverse trajectories originating over Texas and Oklahoma that have crossed the prairies between May 1 and June 13, 2022.
d. Nebraska and Kansas – Until this week, reverse trajectories originating from Kansas and Nebraska have been associated with southeastern Saskatchewan and southern Manitoba (Fig. 5). This past week (June 7-13, 2022) the ECCC model predicted that 8 reverse trajectories passed over the prairies. Six of these reverse trajectories passed over parts of Alberta, including Beiseker, Olds, Edmonton, Rycroft, and Fort Vermilion and Fort St. John in British Columbia.
Figure 5. The total number of dates with reverse trajectories originating over Kansas and Nebraska that have crossed the prairies between April 1 and June 13, 2022.
2. FORWARD TRAJECTORIES (FT) The following map presents the total number of dates (since April 1, 2022) with forward trajectories (originating from Mexico and USA) that were predicted to cross the Canadian prairies (Fig. 6). This week (May 31 to June 6, 2022) there The following map presents the total number of dates (since April 1, 2022) with forward trajectories (originating from Mexico and USA) that were predicted to cross the Canadian prairies (Fig. 6). This week (June 7-13, 2022) there was an increase in the number of forward trajectories (n=34) predicted to cross the prairies compared to last week (n=12). Results indicate that the greatest number of forward trajectories entering the prairies have originated from the Pacific Northwest (Idaho, Oregon, Washington), Montana and Wyoming.
Figure 6. Total number of dates with forward trajectories, originating from various regions of the United States and Mexico, crossing the prairies between April 1 and June 13, 2022.
View historical PPMN wind trajectory reports by following this link which sorts the reports from most recent to oldest.
John Gavloski, James Tansey, Carter Peru, Jennifer Otani and Shelley Barkley
Categories
Week 6
Provincial entomologists provide insect pest updates throughout the growing season so link to their information:
MANITOBA’SCrop Pest Updates for 2022 are up and running! Access a PDF copy of the June 15, 2022 issue here. Bookmark their Crop Pest Update Index to readily access these reports and also bookmark their insect pest homepage to access fact sheets and more! • Flea beetles, cutworms and grasshopper nymphs in MB – Review the above June 15 issue to find greater details but the summary reads as, “Flea beetles levels are at quite high levels in many areas. Some growers have applied up to three insecticide applications for flea beetles, and there has been some reseeding. Some fields of small grains and sunflowers have been sprayed for cutworms. Hatch of the potential pest species of grasshoppers is occurring; some control has occurred in the Central region.” • Diamondback moth pheromone trap monitoring update for MB – “So far, diamondback moth has been found in 29 traps.” Read the report on Page 5 of the June 15, 2022 issue OR review a more detailed summary of cumulative trap counts from 48 sites deployed across the province. • Armyworm pheromone trap monitoring is underway in MB – “So far, counts have generally been quite low, with armyworm moths only being caught in 6 traps.” Read the report on Page 6of the June 15, 2022 issue.
ALBERTA’SInsect 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. The new webpage does not replace the Insect Pest Monitoring Network page. Remember, AAF’s Agri-News occasionally includes insect-related information. Twitter users can connect to #ABBugChat Wednesdays at 10:00 am. • Diamondback moth pheromone trap monitoring update for AB – Cumulative counts arising from weekly data are available so refer to the Live Map. So far, low numbers of diamondback moth have been intercepted across the province. • Cutworm live monitoring map for AB – Reports continue to come in so refer to the Live Map to review areas where cutworms are being found. So far, black army, pale western, and dingy cutworms have been reported. Use this online form to report cutworms in Alberta.
The Pests and Predators Field Guide is filled with helpful images for quick insect identification and plenty of tips to manage the pests AND natural enemies in your fields. Claim your free copy at http://fieldheroes.ca/fieldguide/ or download a free copy to arm your in-field scouting efforts!
Review the Sweep-net Video Series including: • How to sweep a field. Meghan Vankosky (Agriculture and Agri-Food Canada-Saskatoon). Published online 2020. • What’s in my sweep-net? Meghan Vankosky (Agriculture and Agri-Food Canada-Saskatoon). Published online 2020. • Why use a sweep-net? Meghan Vankosky (Agriculture and Agri-Food Canada-Saskatoon). Published online 2020.
Haley Catton, Wim van Herk, Julien Saguez, Cynthia Schock and Jennifer Otani
Categories
Week 6
This week wraps up our series on Prairie wireworms, and we are ending with a bit of an odd one, the flat wireworm (Aeolus mellillus).
The flat wireworm is not found in huge abundance on the Prairies, but it is worth knowing about because it’s different than the other 3 main species. First, it is quite recognizable with its dark reddish-brown head and stripe below its head.
A. mellillus (arrow)
Second, if you ever get one of these in the palm of your hand, it is very active, it will be hard to hold on to it before it crawls away. This activity may be because the flat wireworm is also a predacious species, in fact it might eat other wireworms! But it also eats plants, and the literature says it cuts plants rather than the shredding type of feeding shown by other species. The flat wireworm can grow fast to its mature size of 15 mm. Unlike other wireworm species, Aeolus mellillus has a short 1-2 year life cycle and can pupate anytime between spring and late summer. This species also does not need to mate to reproduce – as far as we know, Canadian populations of A. mellillus are all females!
AAFC has recently released a new field guide on Prairie pest wireworms. It has information on biology, monitoring and management and research on wireworms on the Prairies. Preview pages extracted from the guide highlighting Aeolus mellillus by clicking here.
Free digital copies in both official languages can be downloaded at these links.
