Horticulture

Free resistance testing for aphids

aphids green peach aphids

A new research initiative is investigating the geographical distribution of insecticide-resistance in green peach aphid across Australian cropping regions.

Growers and advisors are encouraged to submit green peach aphid (Myzus persicae) specimen to the National Aphid Insecticide Resistance Surveillance (NAIRS) program for resistance testing.

The free testing service will be offered to the grains industry throughout the 2020 and 2022 growing seasons and will help improve our understanding of distributions and levels of resistance in green peach aphid populations across Australia.

The green peach aphid feeds on a variety of broadacre, broadleaf pastures and horticultural crops. However, critically for canola growers, the pest is also responsible for the transmission of Turnip yellows virus (formerly known as Beet western yellows virus). Crops infected in the early seedling stage can experience seed yield losses of more than 40%.

Resistance testing undertaken in recent years has shown many green peach aphid populations to be highly resistant to synthetic pyrethroids and carbamates, moderately resistant to organophosphates and low-level resistance developing to neonicotinoids. Previous research undertaken by cesar, the WA Department of Primary

Industries and Regional Development and CSIRO also detected a reduced sensitivity to sulfoxaflor (Transform®) in the Esperance region.

NAIRS is being undertaken as part of a new four-year GRDC project, led by cesar in collaboration with CSIRO, DPIRD, ISK, BASF and Corteva.

If you have green peach aphid in your crops you are encouraged to contact Dr Marielle Babineau mbabineau@cesaraustralia.com

Image credit: Cesar Australia