Trap Catches to Aug 26, 2022.
Another big week for aphid captures. A total of 418 aphids were captured across all locations this week (350 of which were vectors of PVY), compared to only 316 last week (of which only 290 were vectors). So our aphid numbers rose again this week. Typically, our aphid numbers start to decrease by the last week in August. It will be interesting to see what happens next week.
(Click on image for larger version)
A large number of Green Peach Aphids were recovered again this week resulting in a big rise in the Regional PVY Vector Risk Index. Soybean Aphids continue to be active and were recovered at multiple locations. Both Corn Leaf and English Grain Aphids continue to be numerous as do Thistle Aphids and Cotton/Melon Aphids. Cannabis aphid captures have also increased this week.
For the first time this year, the number of vector species aphids have surpassed that of 2021 and our PVY Vector Risk Index is more than twice that of this time last year. The late season increase of aphids capable of vectoring PVY has made this a high risk year.
Several locations in MN and ND have already been able to start vine kill. But if there's still green material in the field, PVY can still be vectored by aphids. So, given the number of vector populations present, appropriate management should be considered.
So... Keep scouting, and we'll keep counting...
Cumulative Aphid Species Capture and PVY Vector Risk Index to Aug 26, 2022
