Trap Catches to August 27, 2021.
Trap capture numbers remained very similar to last week's. The numbers of both vectoring and non-vectoring aphids were almost the same. While trap captures per trap were marginally higher than last week, overall numbers are low. This meant only a small increase in the PVY Vector Risk Index. As mentioned last week, the peak aphid flight obviously occurred early this year and so the risk from PVY vectors is lower than at this time last year (our current regional PVY Vector Risk Index is only ~41% of what it was last year).
The species composition is little changed from last week, Cotton/Melon aphids are down, Soybean aphid numbers are up. Buckthorn and cereal aphids remain relatively the same. Overall, these numbers are promising as the season winds down.
Keep scouting, we'll keep counting...
Scouting for aphids in potatoes: