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Andy Robinson

Potato Extension Agronomist

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Aphid Alert for week ending Sep. 5

A marked drop in vector numbers with fewer traps reporting as the season closes down. Nate reports that there are still a lot of soybean aphid (87), bird cherry oat (29), and corn leaf (28). Green peach aphids were also captured this week at Forest River, Gully, and Hallock.

Trap Catches Identified to Sept 5

Aphidalert.blogspot.com

aphidalert.umn.edu

The cooler weather has brought a decrease in aphid numbers this week.  A total of 198 vectors were collected this week, a drop from over 700 last week.  Fewer sites were reporting as some folks have begun to vine kill.
We are continuing to see a lot of soybean aphid (87), bird cherry oat (29), and corn leaf (28).  Green peach aphids were captured at Forest River, Gully, and Hallock.  
Keep Scouting!
Scouting for aphids in potatoes:
- Select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
 - Avoid leaves on the ground or in contact with the soil.
 - In seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of insecticides an effective control for PVY.
 - The use of feeding suppressing insecticides, such as pymetrozine (Fulfill®) or flonicamid (Beleaf®) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields. Some other insecticides, such as clothianidin (Belay®), imidacloprid (Admire Pro® or Provado®), and spirotetramat (Movento®), have also been demonstrated to reduce the transmission of PVY.
- In table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding.

 

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