Gastrophysa cyanea - Green Dock Beetle

Adult: 5mm.

Family Chrysomelidae/ Subfamily - Galerucinae - Skeletonizing leaf Beetles

The Green Dock Beetle is common on Curly Dock, Rumex crispis and related plants like the garden plant, Rhubarb, in spring. Members of the subfamily are called skeletonizing leaf beetles because the eat all but the main veins of the leaves. The elongated bright orange eggs are glued in place on the undersides of the leaves usually along the veins. In a few days the black larvae will appear, feeding and growing rapidly, often stripping all the foliage from the plants. When mature, the larvae crawl to the ground and pupate in the leaf litter. The dock beetles usually will be gone by summer, but there will be additional broods if food supplies persist. Note: Generic name was revised from Gastroidea to Gastrophysa.