trajectories Related to Diamondback Moth (DBM) and Aster Leafhopper
Introductions to the Canadian Prairies in 2015
BACKGROUND: Potential wind events capable
of carrying insect pests from source areas in the USA can be identified by
following trajectories for air parcels through time. High altitude air masses, originating from southern
locations, frequently move northerly to Canadian destinations. Insect pest
species such as Diamondback moth and Aster leafhoppers, traditionally unable to
overwinter above the 49th parallel, can utilize these air masses in the spring
to move north from Mexico and the United States (southern or Pacific
Wind trajectory data processing by AAFC-Saskatoon Staff began in April. Reverse
Trajectories track air masses arriving across the prairies back to
their point of origin. Forward Trajectories predict
favourable winds expected to arrive across the Canadian Prairies.
Updated: April 25-27, 2015
Northwest (PNW) – 49 Reverse trajectories (RTs) were recorded on the Prairies
from northwest USA between April 25-27, 2015.
and SW USA (SW) – Five locations (4 in MB and 1 in SK) reported RT’s that
originated from southern Texas over this same time frame.
2. Forward trajectories
Nine forward trajectories are predicted to cross the
prairies from Mexico and the USA over the next five days.