Twig Girdler

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Pest Profile Photo credit: Dave Rintoul, bugguide.net Licensed under a Creative Commons License Common Name: Twig girdler Scientific Name: Oncideres cingulata Order and Family: Coleoptera; Cerambycidae Size and Appearance: Length (mm) Appearance Egg Elongated-oval White to cream in color 2-3mm 1 egg per pit or niche made in the bark of girdled twigs Females cover pit or niche with a substance that tends to glisten Larva/Nymph White, legless grubs 16-25mm Cylindrical in shape but tapered towards the rear Distinctly segmented Adult Typical longhorned beetle Cylindrical body that is grayish brown in color 12-17mm Has a broad, ashy-gray band across the middle of the wing covers Antennae have 11 segments Pupa (if applicable) White to cream but become darker as the pupa nears adulthood ~12-17m No covering cocoon Antennae, legs, and wing covers are visible Type of feeder (Chewing, sucking, etc.): Both larvae and adults have chewing mouthparts Host plant/s: Elm, hickory, oak, linden, hackberry, apple, pecan, persimmon, poplar, sour gum, honeylocust, dogwood, and some flowering fruit trees. Description of Damage (larvae and adults): Larvae of twig girdlers spend most of their time feeding unseen in dead girdled twigs on the ground until they reach adulthood. After that time, they will emerge from the dead twigs and begin feeding on live twigs of the host tree. Damage is usually minor, consisting of small twigs and branch breaking away or hanging loosely on the tree. However, in heavily infested trees, damage could result in tree death, stunted growth, deformation, or reduced fruit and nut yields the following year(s). Adult females will cut V-shaped pits or niches along girdled twigs to lay their egg in. References: Baker, J., & Bambara, S. (2001). TWIG GIRDLER. Retrieved March 21, 2016, from https://www.ces.ncsu.edu/depts/ent/notes/O&T/trees/note96/note96.html Hyche, L. L. (1995, July). THE TWIG GIRDLER: A GUIDE TO RECOGNITION AND HABITS IN ALABAMA. Retrieved March 24, 2017, from http://enpp.auburn.edu/outreach/web-publications/twig- girdler/ Problem: Twig Girdler - Oncideres cingulata [PDF]. (2016, February 3). Manhattan, KS: Kansas State Unviversity - Research & Extension. Rintoul, D. (2013, October 3). Rintoul, D. (2013, October 3). Twig girdler - Oncideres cingulata. Retrieved March 24, 2017, from http://bugguide.net/node/view/853002/bgimage .

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Study Guide Entomology & Nematology Department
STUDY GUIDE ENTOMOLOGY & NEMATOLOGY DEPARTMENT DPM COMPREHENSIVE EXAMINATIONS The Entomology & Nematology Comprehensive Examinations consist of 3 sections: pest identification (30%), pest biology and management (40%), and core concepts and synthesis (30%). These examinations are limited to information about invertebrate animal pests, principally insects and nematodes, but also plant feeding mites and terrestrial molluscs. A. Pest identification Students will be presented with insects, mites, molluscs, and nematodes that they must identify. Some may be recognizable by sight, but others may require keys for identification. Students will be provided with identification aids (keys), where necessary, and be expected to use them to identify the subjects accurately. The unknowns will be selected from the list of important insect, mite, mollusc, and nematode pests (Table 1) though we will emphasize those with a single or double asterisk [* or **]), as these normally are the more important pests. Included in this list are some that pose a threat but are not currently found in Florida. B. Pest biology and management Students will answer 8-10 questions on insect, mite, mollusc, and nematode pest biology (sampling, distribution, life cycle, damage) and management. The animals for which students are responsible to know biology and management are listed in Table 1 (preceded by double asterisk [**]). C. Core Concepts and Synthesis Section: Students will answer 3 or 4 questions that cover core areas of Entomology/Nematology and demonstrate knowledge of core areas, but also analysis and problem solving. Suggested reference/reading material is listed in Table 2. You might want to read through these in preparation for the Comprehensive Examinations.
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2017 SC Industrious Twig Chewers
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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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