A sample of willow-carrot aphids collected from Cow Parsley in North Yorkshire by Larissa Collins in May 2014 have been found to be resistant to lambda-cyhalothrin by Steve Foster (Rothamsted Research), while screening aphid samples for an AHDB funded project.
The aphids were maintained on carrot in a glasshouse at Fera for the Crop Health and Protection Centre (CHAP). The aphids survived doses of lambda-cyhalothrin.
Willow-carrot aphids cause feeding damage to carrots and transmit yield and quality reducing viruses. This is also something for seed potato growers to take into consideration: willow-carrot aphid transmits PVY and PVA 50% as efficiently as Myzus persicae and occurs in large flights early in the year when the potato plants are young and susceptible to virus transmission.
Monitoring aphids can help target insecticide sprays effectively. Fera offers an aphid monitoring service for both carrot and seed potato growers. Click on the link below to find out more: