Trap Catches Identified to August 18
Greetings!
Welcome to the Aphid Alert update for the week ending August 18. The number of vector captured in traps dropped slightly this week compared to last (901 total vectors captured last week and 853 this week). These numbers, however, still are very high and the PVY Vector Risk Index continues to rise steeply with weekly jumps far larger than total Index values from last year. The PVY Risk Index maps tells the story pretty clearly, we're having a very heavy aphid year with high populations in most areas. We strongly recommend scouting and the use of crop oils. Anti-feeding insecticides should be applied if required (see below)
Trap catches at two locations were still in the hundreds this week (Humboldt with 337 vectors and Ada with 209). Green peach aphid is still being recovered from numerous locations, some in high numbers. Soybean aphid flights continue in several locations with ND now seeing movement of these aphids. Corn leaf aphids remain numerous and Bird Cherry Oat aphids are also starting to rise. Sunflower aphids took a rise in several of the northern locations and Buckthorn aphid flights are rising as well. Hopefully the increased movement of both Soybean aphids and Buckthorn aphids will soon represent movement back to the overwintering host of both of these species, Buckthorn.
The PVY Risk Index map, weekly counts and cumulative PVY Index values are attached below. Be advised of the increases in your area.
Trap catches at two locations were still in the hundreds this week (Humboldt with 337 vectors and Ada with 209). Green peach aphid is still being recovered from numerous locations, some in high numbers. Soybean aphid flights continue in several locations with ND now seeing movement of these aphids. Corn leaf aphids remain numerous and Bird Cherry Oat aphids are also starting to rise. Sunflower aphids took a rise in several of the northern locations and Buckthorn aphid flights are rising as well. Hopefully the increased movement of both Soybean aphids and Buckthorn aphids will soon represent movement back to the overwintering host of both of these species, Buckthorn.
The PVY Risk Index map, weekly counts and cumulative PVY Index values are attached below. Be advised of the increases in your area.
Remember, keep scouting!
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Total 2016 PVY Vector Risk Index for Comparison
Weekly Trap Capture by Location
Cumulative Seasonal Capture & PVY Vector Risk Index by Location
