Trap Catches Identified to July 28

Greetings!

Welcome to the Aphid Alert update for the week ending July 28.  The aphid year continues - with a vengeance!

Trap catch did vary slightly this week; some reporting record numbers while others not so much. The PVY risk index skyrocketed in some sites due to high vector capture. Vector numbers were up at Brooks (81), Gully (35), Moran (25), McVille (84), Hoople (92), Staples (39) and this weeks big one - Humboldt with 183 vectors.  A few Green Peach aphids were present as well in Staples (4), Humboldt (3), Gully (2) and Hoople (1).

This year continues to be a high vector year. Soybean aphids are still on the rise in some soybean fields throughout much of MN.  Some of these populations continue to show pyrethroid resistance. Meaning that some fields still aren't quite getting adequate control. This may add to the number of soybean aphids moving into seed potato production areas.  While soybean aphid does not colonize potatoes, it is indeed a vector. So remember to keep your eyes open. We have started to test for soybean aphid resistance in some NW MN fields. We are looking for samples from sites that are reporting levels of resistance. That way we will have a better idea of both where we are seeing this resistance as well as what the actual level of resistance is.

Scouting obviously should be on the To Do list by now.  Due to another week of  high vector catch numbers, crop oils are still highly recommended. Data shows that narrow range mineral oils (e.g. Aphoil, Stylet Oil) applied at least once per week can significantly decrease the spread of PVY (twice per week is even better).

Remember, keep scouting!

Click on any figure to see full-size version.

2016 PVY Vector Risk Total for Comparison

Weekly Catch by Location

Cumulative Species Catch to Date by Location