Trap Catches Identified to August 30, 2019

Greetings

Aphid captures were up from last week, with 151 vectors being recovered from traps. A wide variety of species were captured this week, including some efficient vector species. The capture of 14 Green Peach Aphids from 3 locations (Ada, Crookston and Syre MN) caused a big increase in the PVY Vector Risk Index values in those locations.  With this week's capture, we are tracking higher than last season's totals, with potentially 2 weeks of trapping remaining.  Some locations are vine killing this week and will discontinue trapping. 

Ada MN again led aphid captures this week with 100 total vectors being recovered, including 7 Green Peach Aphids! This caused doubled the vector risk index for that location. Several other important vector species were also recovered from the Ada trap this week.  Syre also recovered numerous vectors this week (37) including 6 Green Peach Aphids and also saw a increase in its PVY Vector Risk Index. 

Aphids continue to be entering potato fields in numbers and Oil and early vinekill are recommended practices to decrease late season movement of PVY.  Remember: If Potatoes Are Green, By Vectors They'll Be Seen!
  
Aphid Fact of the Week - Aphid species that colonize potatoes, including Green Peach Aphids, preferentially colonize the field edge first, later dispersing into the rest of the field.  This may be a response to the contrast of the green canopy to the bare soil at the headland of potato fields.  If that is the case, it underscores the importance of scouting and protecting plants until vinekill is complete.

As always, keep on scouting!

Click on any image below for full-scale version.

Cumulative PVY Vector Risk Index to August 30, 2019.

Cumulative PVY Vector Risk Index for 2018 (for comparison)

Aphid Species Capture and PVY Vector Risk Index for Aug 24-30, 2019

Cumulative Aphid Species Capture and PVY Vector Risk Index to Aug 30, 2019