Peach Twig Borer

Anarsia lineatella

Peach twig borer adult
Peach twig borer adult. Photo courtesy of Donald Hobern. Licensed under CC BY 2.0.
As its name suggests, the peach twig borer is a significant pest of peaches. They also attack other stone fruits and almonds. They are distributed globally in North America, Europe, and Asia.
Adult peach twig borer moths are mottled grey in color and are approximately 1/4" long.
Peach twig borer adult
Peach twig borer adult on the trunk of a tree. Photo courtesy of Donald Hobern. Licensed under CC BY 2.0.
Larvae are brown in color with dark and light bands. They reach a length of 1/2" when fully grown.
Peach twig borer larva
Peach twig borer larva. Photo courtesy of Eugene E. Nelson. Licensed under CC BY 3.0.
Larvae feed directly on fruit and nuts, particularly as they reach maturity, resulting in blemishes and crop losses. They also feed on young shoots causing them to wilt and die.
Many insecticides are available for controllingn peach twig borer. Sprays should be timed for when the larvae are young and more vulnerable. Always read and follow all label instructions.
For low populations in areas far from untreated orchards, mating disruption can provide some control. The idea is to blanket the orchard with pheremone so that male moths cannot find females and mate. The unmated females then die without producing any eggs.