Twig Girdler Oncideres Cingulata Order Coleoptera, Family Cerambycidae; Longhorned Beetles, Roundheaded Borers Native Pest

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Twig Girdler Oncideres Cingulata Order Coleoptera, Family Cerambycidae; Longhorned Beetles, Roundheaded Borers Native Pest

Pests of Trees and Shrubs Twig girdler Oncideres cingulata Order Coleoptera, Family Cerambycidae; longhorned beetles, roundheaded borers Native pest Host plants: Basswood, dogwood, elm, hackberry, honeylocust, oak, poplar, pecan, persimmon, poplar, sourwood, and fruit trees Description: Adults are grayish brown, approximately 15 mm long, with scattered yellow spots, fine golden hairs covering the head, and fine gray hairs covering the elytra. Mature larvae are 18 mm in length and are white with black heads. Girdling damage caused by twig girdler adult female. (246) Life history: Eggs are deposited in girdled twigs. Twigs Photo: Clemson University Cooperative Extension Service or branches soon die and fall to the ground. Larvae feed on these fallen twigs until the middle of the following summer. Adults emerge in late summer and feed on twig tips or tender stem bark. There is usually one generation a year, but many larvae do not pupate until the second year. Overwintering: Larvae in twigs on the ground. Damage symptoms: On trees that are heavily infested, large numbers of branches may be girdled, then turn brown, and fall. Young trees may suffer severe damage. Monitoring: In August and September, look for twigs that have gathered under trees and that display signs of having been cut. Cut open a sample to verify the presence of girdler larvae. Physical control: Collect and destroy infested branches Twig girdler adult female ovipositing eggs into stem; note that and twigs at the end of the growing season. she is beginning to girdle. (247) Chemical control: None suggested. Photo: John Davidson Biological control: Two hymenopterous parasitoids are recorded, but their degree of control is unknown. The downy woodpecker, blue jay, and black-capped chicka- dee all feed on larvae. Plant mortality risk: Low Biorational pesticides: None Conventional pesticides: None Twig girdler larva. (248) Photo: John Davidson IPM of Midwest Landscapes 210.

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■ ,VVXHG LQ IXUWKHUDQFH RI WKH &RRSHUDWLYH ([WHQVLRQ :RUN$FWV RI 0D\ DQG -XQH LQ FRRSHUDWLRQ ZLWK WKH 8QLWHG 6WDWHV 'HSDUWPHQWRI$JULFXOWXUH 'LUHFWRU&RRSHUDWLYH([WHQVLRQ8QLYHUVLW\RI0LVVRXUL&ROXPELD02 ■DQHTXDORSSRUWXQLW\$'$LQVWLWXWLRQ■■H[WHQVLRQPLVVRXULHGX AGRICULTURE Twig Girdler and Twig Pruner mall branches accumulating on the ground and the Adult beetles typically begin to emerge in mid-August presence of clean-cut twigs, and in some cases and continue through early October. During this time, the Sdangling (flagged) branch tips within a tree, indicate adult female chews a V-shaped groove around a small twig, the presence of beetle pests referred to as twig girdlers and girdling it (Figure 2). She then deposits an egg beneath the twig pruners. Both of these long-horned beetle species bark in the twig section beyond the cut (severed portion). (Cerambycidae) attack numerous types of shade, nut and fruit This is because the larva is unable to develop in healthy trees. Heavily damaged trees appear ragged and unattrac- sapwood. The cut made by the adult female is deep enough tive, and young trees can become deformed by repeated around the twig so that the girdled portion dies quickly and attacks. usually falls to the ground, either because of wind or its own weight. During the oviposition period, large numbers of girdled Twig girdler (Oncideres cingulata) twigs often accumulate beneath the tree each day. After hatching from the egg, the developing larva bores into the Hosts dead twig to feed. The small larva will overwinter in the Common hosts of the twig girdler include persimmon, fallen twig. During the following spring, the larva resumes pecan, elm, hickory, oak, honeylocust, hackberry, poplar, feeding, consuming most of the wood.
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