Trap Catches Identified to August 08, 2020.

Aphid numbers took a jump this week with the total aphid numbers and the number of vector species doubling over last week.  The Damson Hop aphid, which was recovered at 3 different sites this week, Cannabis aphids also were captured this week, although only at one location.  Thistle aphids have started to appear and small grain aphids also increased in numbers.  Potato aphids remain well established in several locations.  Several of these vector species being recovered are relatively effective.  Consequently, the PVY Vector Risk Index more than doubled this week.

Even though numbers have doubled from last week, aphid captures and the PVY Risk Index values are less than half what they were at this time last year. Compared to many past years, this remains a low aphid year.  But even a few aphids can move inoculum around in a field.  So keep scouting!  

 

If you have a field where Colorado Potato Beetle aren’t being controlled by insecticides, please let us know.  We’d like to get samples of that population to test for insecticide resistance.  Contact Ian MacRae at 218-280-9887.

As always, keep on scouting!

Click on any image below for full-scale version.

Cumulative PVY Vector Risk Index to August 08, 2020.

    

Cumulative PVY Vector Risk Index for 2019 (for comparison)

Aphid Species Capture and PVY Vector Risk Index for the week ending August 08, 2020

Cumulative Aphid Species Capture and PVY Vector Risk Index to August 08, 2020.