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Green peach aphid

Resistance in green peach aphids has escalated as a result of heavy reliance on insecticides. A new testing service takes the risk out of choosing the most effective product

Green peach aphids (adults and nymphs) (Source: cesar)


About this pest

The green peach aphid (Myzus persicae) is a pest of many crops but primarily attacks canola, lupins and other pulse crops. They are most common in autumn and seldom cause economic losses to crops through direct feeding. However, the green peach aphid is an important vector of several plant diseases.

Widespread infestations of green peach aphids during autumn and winter in 2014 contributed to a sever outbreak of beet western yellow virus (BWYV) across SA, western Victoria and some parts of NSW. The severity of the 2014 BWYV outbreak was exacerbated by the prevalence of insecticide resistance in green peach aphids populations.

Resistance testing service

This year, cesar is offering a testing service to growers and advisers to determine the presence of insecticide resistance in green peach aphids populations. The tests available cover the three main insecticide groups used to control green peach aphids, and other crop aphids, in Australia: pyrethroids (Group 3A), organophosphates (Group 1B) and carbamates (Group 1A).

cesar uses genetic assays to ensure accuracy and quick results. Resistance results are typically available 7-10 days after receiving aphid samples. Due to the nature of the genetic assays being undertaken, the cost for the resistance tests is dependent on the number of individual samples being screened at one time. Assays become more cost-effective as the number of samples increases.

For further information about this new testing service, contact Anthony van Rooyen at or phone 03 9349 4723.

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