Chemical and organic control of asparagus beetle

Where hand removal of beetles and larvae is not possible, large crops of asparagus can be treated with insecticide from late spring to early autumn.

Insecticides should be used only as a last resort. Before application, ensure plants are receiving the appropriate cultural care and take steps to protect natural predators. 

Organic sprays containing natural pyrethrums can be used. These products have a short persistence so may need to be applied a number of times before the asparagus beetle population is under control. 

Follow instructions carefully when using insecticides. Plants in flower should not be sprayed due to the danger insecticides pose to bees and other pollinating insects. Insecticides can cause an outbreak of red spider mite since they often kill benefical insects that control mites.