Trap Catches to July 21-28, 2023.

What a difference a week makes, aphid numbers are way up...  Higher temperatures have driven aphid population development and is likely responsible for the increase in aphid flights we recorded for the last trapping period.  With 14 traps in MN and ND reporting, we had a total of 550 vector aphids captured in traps.  There were also high numbers of non-vector aphids recovered.  

We had the return of a single green peach aphids from Becker, MN.  The seasonal late season dispersal flights of soybean aphids has started with a total of 115 aphids from 12 of the 14 traps reporting.  English grain aphids, prominent in our small grains this season, are moving from small grains in search of alternate hosts as grain continues to mature; we recovered an overall total of 124 individuals with every site but two (Perham and Staples I) returning varying numbers.  The numbers and distribution of potato and thistle aphids were both up and cotton/melon aphids were also numerous and widespread. 

Along with the increased numbers, the PVY Vector Risk across the region rose, but wasn't consistent across all trap sites.  Compared to this time last year, both 2022 total aphids and vector species captured were about half of 2023 numbers.  Overall, this season's aphid captures seems slightly higher than the 2012-2020 average but still has roughly the same pattern of growth.  But, remembering last year's rapid late season increase in aphids, it's still too early to say what the rest of the season has in store...

So, you keep scouting and we'll keep counting. 

Click on any image below for full-scale version.

Cumulative PVY Vector Risk Index to 7/28/2023

Cumulative PVY Vector Risk Index to 7/29/2022 for Comparison

Aphid Species Capture and PVY Vector Risk Index for the week ending 7/28/2023

Cumulative Aphid Species Capture and PVY Vector Risk Index to 7/28/2023