Friday, September 22, 2023


Trap Catches to Sep 08 - Sep 15, 2023.

The trapping season is officially over.  This year's aphid vector populations rose steadily and then had the typical seasonal collapse in early September.  A complete Seasonal breakdown will be published next week.  

We hope harvest goes well for everyone!  

You keep scouting and we'll keep counting. 

The PVY Risk Index Index
Not all species of aphid are equally efficient at transmitting PVY, some are better than others (green peach being the most efficient vector of PVY).  So, the total number of aphids in a trap don't necessarily reflect just how much vector pressure there is at that location.  The PVY Vector Risk Index compares aphid numbers, incorporating their relative vector efficiency compared to the Queen of PVY vectors (green peach aphid!).  Using averaged reference comparisons from the literature, we multiply the number of each aphid species captured by its efficiency compared to Green Peach Aphid to more accurately depict risk posed by the species being trapped.  We then sum the totals.  The PVY-VRI values are presented on the tables below but also on maps comparing current cumulative risk to the total risk from the sample sites of last year (to compare with your local winter grow out results).

Click on any image below for full-scale version.

Cumulative PVY Vector Risk Index to 9/15/2023

Cumulative PVY Vector Risk Index to 9/09/2022 for Comparison

Weekly Aphid Species Capture and PVY Vector Risk Index for all sites reporting the week ending 9/08/2023

Cumulative Seasonal Aphid Species Capture and PVY Vector Risk Index for all sites to 9/08/2023