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Asparagus beetle is the most widespread and damaging pest of asparagus during the summer months. Heavy infestations weaken the plants and cause a poor crop in the following spring.
Both the adult and larval stages of asparagus beetle eat the foliage of asparagus, they can also gnaw bark from the stems, causing growth above the point of damage to dry up.
Burn old stems at the end of the year to destroy overwintering beetles. Hand pick the beetles and larvae from plants when seen from late spring onwards.
Large plantings, where hand removal is not feasible, can be sprayed with the organic insecticide pyrethrum (e.g. Bug Clear Gun for Fruit & Veg, Pyrol Bug & Larvae Killer or Defenders Bug Killer). No synthetic insecticides are available to the home gardener for control of pests on asparagus.
Plants in flower should not be sprayed to avoid harming bees and other pollinating insects.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
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