Trap Catches Identified to August 16, 2019

Greetings

It's been another big week for aphids with 200 plus aphids being recovered in the traps - of course, almost 100 of those came from one trap (must have been a busy week for aphids in Ada, MN!).  Lots of cereal aphids and a few Green Peach Aphids again this week, and a real mix of species at several locations...

The trap at Ada, MN recovered almost 100 aphids this week, more than half of which were English Grain Aphid (this doubled the PVY Vector Risk Index values for Ada).  Cereal fields in the region have turned and are coming up on harvest, explaining the movement of cereal aphids.  Never-the-less, 58 English Grain aphids in one week was a big capture!  Other than that, Cotton/Melon and Thistle Aphids were captured at several locations.  Soybean aphids have also been increasing (but are still at very low numbers) at a number of locations.  Green Peach aphids were recovered at 1 location this week..  

The PVY Vector Risk Index has doubled again this week and is on track with last year's.  Seems 2019 is quickly making up for a low start.  

If potatoes still have green leaves, there can still be transmission of PVY.  Aphid dispersal events are continuing and scouting and oil applications are again strongly recommended! 

Aphid Fact of the Week - Many of our PVY vectors don't overwinter in NW MN and NE ND.  Those that do generally will be seeking overwintering hosts within the next month.  For many of these species, this will also mean the development of male forms and eventual sexual reproduction which leads to the production of eggs (the overwintering stage of many of these species).    

As always, keep on scouting!

Click on any image below for full-scale version.

Cumulative PVY Vector Risk Index to August 16, 2019.

Cumulative PVY Vector Risk Index for 2018 (for comparison)

Aphid Species Capture and PVY Vector Risk Index for Aug 09-16, 2019

Cumulative Aphid Species Capture and PVY Vector Risk Index to Aug 09-16, 2019