Title : Peach twig borer
Visit Count : 3232 Time(s)
Upload Date : 2/28/2016 - 6 Year(s) ago
Category : Stone fruit
Sunday, February 28, 2016
Visit Count : 3232 Time(s)
Upload Date : 2/28/2016 - 6 Year(s) ago
Category : Stone fruit

: Pest Name: Anarsia lineatella (Lep: Gelechidae) - Peach twig borer
The peach twig borer is one of the most important peach pests. The 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.
Damage:
Peach twig borer attacks apricots, nectarines, plums and prunes, as well as peaches.
The first sign that the peach twig borer is in the orchard may be wilting, or flagging, of new growth in the spring. As buds open and new leaves begin to grow, the overwintering larvae burrow down the tender shoots, which then wilt and die. Twig or shoot damage may be more severe on young trees. One overwintered larva may attack more than one shoot. In high numbers they can cause extensive damage to young trees or nursery stock.
Larvae of the succeeding generations feed on shoots or fruit. They attack fruit at the stem end, where two fruit touch or where leaves touch the fruit. They also may feed along the sides of the fruit, disfiguring it.

Life stages
Egg: The egg is yellowish white to orange and oval.
Larva: 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.
Pupa: The pupa is smooth, brown and does not reside in a cocoon. Pupae are usually found beneath bark scales or cracks in the bark.
Adult: The adult moth is steel gray with white and dark scales.
The peach twig overwinters as first or second instar larvae in cells, known as hibernacula, under the thin bark in limb crotches or in bark cracks. To detect the hibernacula, look for small chimneys of frass and wood chips built up by larvae feeding under the bark. During bloom and petal fall, overwintered larvae emerge from their cells, migrate up the small limbs and twigs and begin to feed on buds and young leaves. As terminal growth develops, a larva will enter a single shoot, boring down the center, causing the terminal to wilt or flag. When mature, the larva leaves the mined shoot in search of a protected place to pupate. Adults from overwintering larvae usually begin to emerge in mid- to late May. Females each lay between 80 and 90 eggs on fruit, shoots or the undersides of leaves next to veins. The eggs, which are laid singly, hatch in 5 to 18 days, depending on temperature.
Reference:
Tree Fruit Research & Extension Center,Orchard Pest Management Online . Washington State University available by http://jenny.tfrec.wsu.edu/opm/displaySpecies.php?pn=90
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