Insects

Peach Twig Borers

Peach Twig Borers
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The Peach Twig Borer has become a common pest of peaches and other tree fruits. It can kill twigs and disfigure or infest fruit. The damage is similar to that caused by the oriental fruit moth. They attack apricots, nectarines, plums and prunes, as well as peaches.
The egg is yellowish white to orange and oval.
The larva has a dark brown head and prothorax with distinctive alternating dark and light brown bands around the abdomen. The larva has 4 or 5 instars. A mature larva may grow to 1/2 inch (12 mm) long.
The pupa is smooth, brown and does not reside in a cocoon. Pupae are usually found beneath bark scales or cracks in the bark. The adult moth is between 1/3 and 1/2 inch (8 to 12 mm) long. It is steel gray with white and dark scales.
Peach twig borer overwinters on the tree as a first- or second-instar larva within a tiny cell, called a hibernaculum, that is located in crotches of 1- to 3-year-old wood, in pruning wounds, or in deep cracks in bark. The overwintering site is marked by a chimney of frass and is especially noticeable when first constructed or before winter rains set in. Larvae emerge in early spring, usually just before and during bloom, and migrate up twigs and branches where they attack newly emerged leaves, blossoms, and shoots. As shoots elongate, larvae mine the inside, causing the terminals to die back. Dead shoots are known as shoot strikes or flags.

Scientific name: Anarsia lineatella