The pits are easy break points on the stem and points where moisture loss occurs. In 1994, VLB was detected in the United States in Maine and Cayuga County of the state of New York in 1996 (Weston 2005). Viburnum Leaf Beetle (Coleoptera: Chrysomelidae). Available online at: Weston, P., Hoebeke, E., Eshenaur, B., and Klass, C. 2012. Spraying against adults alone is not an effective control strategy. Adults also feed on the leaves of host plants as seen in Figure 6 below. Shrubs repeatedly defoliated over a period of two to three years are likely to die. Viburnum Leaf Beetle: Update on a recently arrived landscape pest. These pits create weak points along the twigs and stems which are break points and cause twig and stem tips to die. http://www.fs.fed.us/ne/newtown_square/publications/technical_reports/pd... http://idl.entomology.cornell.edu/files/2013/11/Viburnum-Leaf-Beetle-12g... http://www.hort.cornell.edu/vlb/VLBimpactOnArrowwood.pdf, http://msue.anr.msu.edu/news/viburnum_leaf_beetle_now_in_michigan, College of Food, Agricultural, and Environmental Sciences, Ohio Agricultural Research and Development Center, 2120 Fyffe Road | Room 3 Ag Admin Bldg. In 2015, the beetle was reported across the Chicago region with some regularity. Pest Alert: Viburnum Leaf Beetle. Fact Sheet, University of Guelph. Only spray infested viburnum plants and try to avoid drift onto other plants to preserve pollinators and other beneficial insects in the yard and garden. Hoebeke. They are laid in rows of pits (3 to 8 eggs/pit) chewed into the new shoots (current year and sometimes the one-year old shoots, as well) during late summer. The capped egg pits are easy to see on the stems after leaf-drop. These recommendations are provided only as a guide. VLB activity is observed in both native populations and ornamental plantings of viburnums. 2120 Fyffe Road | Room 3 Ag Admin Bldg. Valued plantings of the European cranberrybush viburnum can be severely damaged by larval and adult feeding. Map views: view summarized survey results for this map pest page. The sheen is produced by short, golden-grey hairs. The egg-laying sites are often arranged in a straight row on the undersurface of the terminal twig. Selected reference: Weston, P.A., G. Desurmont, and E.R. In 1996 it was discovered in New York State. Neonicotinoid insecticides and other systemics can be used for adult or larval control, but these treatments should be avoided if you are treating species of viburnum that are within 4 to 6 weeks of flowering. Viburnum leaf beetle. They complete just one lifecycle each year. The viburnum leaf beetle is native to Europe and has become a serious pest of viburnum plantings and nursery stock in the Northeast United States. Once the pits are filled with eggs, the pits and eggs are covered with a “cap” of feces and chewed bark and wood mixed with saliva. Most of the damage is caused by the larvae in spring but some further damage is done by the adult beetles in late summer. Soldier beetle gallery. It is always the pesticide applicator’s responsibility, by law, to read and follow all current label directions for the specific pesticide being used. Eggs are not laid in plain view. Murray, T. 2004. The viburnum leaf beetle (VLB) (Pyrrhalta viburni) [order Coleoptera: family Chrysomelidae] damages a variety of viburnum species and hybrids by feeding and egg-laying activities. Pictures and more information about larvae. Planting species or cultivars of Viburnum that are resistant or less susceptible to VLB may reduce the severity of an infestation preventing defoliation. This site designed and maintained by CFAES Marketing and Communications. Contact your county OSU Extension office for more information. The viburnum leaf beetle (Pyrrhalta viburni) is an invasive pest from Europe that is currently established in the eastern United States, British Columbia, and parts of Washington. As the larvae grow, their feeding becomes more aggressive and holes are produced through the entire leaf. Pictures and more information about pupae, Pictures and more information about adults. In 2002, VLB was found in Ashtabu… When disturbed, the beetles will fly away or drop to the ground. VLB has a complete life cycle with four distinct stages: egg, larva (3 larval instars), pupa and adult. Map views: view summarized survey results for this map pest page. Mature larvae are thick-bodied with the thorax having six obvious legs, grow to a length of about 1/2", and are yellow-green in color with a pattern of black spots, and black head and legs as shown in Figure 3. For an accessible format of this publication, visit cfaes.osu.edu/accessibility. Horticultural oils (generally 2 to 3 percent) and/or insecticidal soaps are useful for control of VLB larvae. Figure 2: Newly hatched, first instar viburnum leaf beetle larvae and damage. Adult viburnum leaf beetles are a shiny gold color, especially in the sun. Viburnum Leaf Beetle; More Gardening Resources from Cornell Video: Adult laying eggs [Video by Jame Reilly] Larva emerging [Video by D. Swaciak] Larva feeding [Video by Kent Loeffler.] For more information, visit cfaesdiversity.osu.edu. Complete development from egg hatch to adult emergence generally takes 8 to 10 weeks. They're recently been discovered in British Columbia. The most effective means of mechanical control of VLB on small plants and small-scale plantings is to prune and destroy infested twigs after egg laying has ceased in the fall, anytime from October to April. There is concern that the residues of these insecticides will end up in the nectar or pollen and harm pollinators. Adult females lay up to 500 eggs on viburnum twigs in summer and early fall. Both the larvae … These rows of capped pits can be observed from July through the following spring. They are native to and found throughout most of Europe. Native plantings of arrowwood ( Viburnum … In the United States, they have been reported in parts of New York State, Maine, Pennsylvania, Vermont, and parts of Ohio. Columbus, Ohio 43210 The pupal stage lasts 10 to 14 days. VLB was first discovered and identified in North America in 1947 in the Niagara Peninsula of Ontario, Canada, and has spread from there (Ventresca and Kessel 2012). Newly hatched larvae tend to feed side-by-side on the underside of the leaves between the veins of the leaf. However, repeat sprays may be needed for adults in July if adults migrate back into plantings. In Canada, they are currently found in many areas of Ontario and the Canadian Maritime Provinces. In 2002, VLB was found in Ashtabula County, Ohio, where it appeared to have been established for at least two years based on egg pit scars from two different growing seasons. Multiple defoliations can weaken and/or kill host plants. Viburnum leaf beetle has been known in some eastern states since the early 1990’s. Larvae are yellow or green and twice as long as the adults. Adult feeding [Video by D. Swaciak] Logo images by Kent Loeffler, Paul Weston & Craig Cramer viburnum leaf beetle violet gall midge western poplar clearwing western spotted cucumber beetle white pine weevil whiteflies woolly alder aphid new woolly ash aphid woolly beech aphid.
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