What is asparagus beetle?
Asparagus beetle is a pest both in its adult and larval stages. They eat the foliage, and 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 pyrethrum (Py Spray Garden Insect Killer, Doff All in One Bug Spray or Scotts Bug Clear Gun for Fruit & Veg). If the plants are in flower, spray at dusk to avoid harming bees.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)