Trap Catches Identified to June 22nd
Greetings!
Welcome to the inaugural 2018 Aphid Alert report! This year, we have 19 trap locations, including one new site in Grenora, ND.
So far this year, we have seen very few aphids and very little vector pressure. With 6 sites reporting, Perham did capture 1 Green Peach Aphid. Only 5 other vector species were recovered from the traps.
Aphid numbers are lower than they were at this time last year. There are a few factors at play that could explain a delayed start for aphids. A late spring and early dry conditions, as well as wind events, such as the one in the figure below below that could have brought that Green Peach Aphid up to Perham. The winds bringing some aphid species (including Green Peach Aphids) into our area from the south have very specific conditions and have to terminate in rain. NOAA's Air resources Lab has a great online tool to backtrack wind events (HYSPLIT); we use this tool to check if certain wind events may be bringing aphids our way.
As the summer progresses, the various storm events as well as increasing temperatures may well causes the vector populations to rise, so we will make sure to keep you updated!
Aphid numbers are lower than they were at this time last year. There are a few factors at play that could explain a delayed start for aphids. A late spring and early dry conditions, as well as wind events, such as the one in the figure below below that could have brought that Green Peach Aphid up to Perham. The winds bringing some aphid species (including Green Peach Aphids) into our area from the south have very specific conditions and have to terminate in rain. NOAA's Air resources Lab has a great online tool to backtrack wind events (HYSPLIT); we use this tool to check if certain wind events may be bringing aphids our way.
As the summer progresses, the various storm events as well as increasing temperatures may well causes the vector populations to rise, so we will make sure to keep you updated!
In the meantime, keep scouting!
6/22/2018 Cumulative PVY Risk (click to enlarge)
2017 Cumulative PVY Risk (click to enlarge)
Weekly Catch 6/22/2018 (click to enlarge)
HYSPLIT Backtrack of wind events ending with a rain event on May 29, 2018 (click to enlarge)
