Viburnum Leaf Beetle (Coleoptera: Chrysomelidae). In 1994, VLB was detected in the United States in Maine and Cayuga County of the state of New York in 1996 (Weston 2005). From late June or early July until October, females chew holes (1/8" x 1/8") in small branches or twigs of viburnum (generally the current year’s growth, but occasionally in the previous year’s growth) for laying eggs. Feeding initially appears as a skeletonization (lower leaf surface and middle layer of leaf is consumed and upper leaf surface is left intact). VLB overwinters in the egg stage in the pits in which they were laid. Viburnum Leaf Beetle Citizen Science Project: Summary of 2003 findings. No damage occurs during the pupal stage. Viburnums, including American cranberrybush viburnum, arrowwood viburnum… Figure 6: Adult viburnum leaf beetle injury from feeding. Available online at: Weston, P., Hoebeke, E., Eshenaur, B., and Klass, C. 2012. The capped egg pits are easy to see on the stems after leaf-drop. Viburnum leaf beetle home How to ID viburnum leaf beetles Timeline - What to look for through the year Logo images by Kent Loeffler, Paul Weston & Craig Cramer: Lifecycle summary: Viburnum leaf beetles only infest viburnums. Columbus, Ohio 43210 Map views: view summarized survey results for this map pest page. Origin Pyrrhalta viburni adults’ feeding damage consists of irregular circular holes, and severe feeding can nearly defoliate shrub. There is one generation annually. Figure 5. Adult feeding [Video by D. Swaciak] Logo images by Kent Loeffler, Paul Weston & Craig Cramer The pupal stage lasts 10 to 14 days. A pair of adult viburnum leaf beetles. Shrubs repeatedly defoliated over a period of two to three years are likely to die. Viburnum leaf beetle larvae are voracious leaf eaters, feeding on the areas between the veins creating a “skeletonized” appearance. Thorough coverage of plant foliage is needed as these pesticides only kill by contacting the insects. Multiple defoliations can weaken and/or kill host plants. Mated female viburnum leaf beetles chew pits into the bark of twigs and stems of the host shrubs into which eggs are laid. There is concern that the residues of these insecticides will end up in the nectar or pollen and harm pollinators. As the larvae grow, their feeding becomes more aggressive and holes are produced through the entire leaf. Pest Alert: Viburnum Leaf Beetle in Weeder’s Digest Newsletter of the Whatcom County Master Gardeners. In 1996 it was discovered in New York State. Larval feeding continues through late spring to early summer. However, repeat sprays may be needed for adults in July if adults migrate back into plantings. Eggs are ball-shaped, yellow-brown to brown in color with a sculptured surface and about 1/16" in diameter. 2012, Weston and Nuzzo 2008, Wilson 2011). Ventresca, M., and Kessel, C. 2012. VLB activity is observed in both native populations and ornamental plantings of viburnums. The stems are weakened by the pit-chewing process. 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. The viburnum leaf beetle (VLB), Pyrrhalta viburni (Paykull), which is native to most of Europe, consumes the foliage of plants in the Genus Viburnumto support its growth and development. Cornell University. Pictures and more information about larvae. Repeated defoliation stresses the shrub and can lead to its death within 2 – 3 years. Pictures and more information about larva damage. Spraying against adults alone is not an effective control strategy. They're recently been discovered in British Columbia. CFAES Diversity | Nondiscrimination notice | Site Map. CFAES COVID-19 Resources: Safe and Healthy Buckeyes | COVID-19 Hub | CFAES Calendar. Pruned twigs should be removed from the area and buried, burned, or placed into an active composting pile. Fact Sheet, University of Guelph. Both adults and larvae feed on the foliage of the host plant; larvae feed on the foliage from mid-spring to early summer and adults feed on the foliage from mid-summer into the fall. Figure 4: Viburnum leaf beetle pupae recovered from soil beneath host plant. Larvae are yellow or green and twice as long as the adults. Viburnum Leaf Beetle—Pyrrhalta viburni. Weston, P. A. In the United States, they have been reported in parts of New York State, Maine, Pennsylvania, Vermont, and parts of Ohio. College of Food, Agricultural, and Environmental Sciences Adults appear in mid-summer (late June to early July) and may be found on host plant foliage and stems until the first heavy (killing) frost. If you have a disability and experience difficulty accessing this content request accommodation here. The Impact of Viburnum Leaf Beetle on Native Arrowwood. Viburnum leaf beetle. Additional damage to host plants is produced by the egg-laying process. The head, thorax and elytra (wing covers) are generally golden-brownish, but the shoulders of the elytra and front edge of the front wings are darker brown. Wilson, M. 2011. Viburnum Leaf Beetle: Update on a recently arrived landscape pest. A female can lay up to 500 eggs. In 2015, the beetle was reported across the Chicago region with some regularity. Figure 2: Newly hatched, first instar viburnum leaf beetle larvae and damage. Accessibility Accommodation. The viburnum leaf beetle (VLB), Pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage Viburnum species. Heavy infestations by VLB can defoliate shrubs, cause dieback, and eventually kill plants. When a female lays eggs, she will typically chew pit after pit in the young stems. This site designed and maintained by CFAES Marketing and Communications. They complete just one lifecycle each year. Map of plant locations (Plant location data may be incomplete) In Collection(s): None Listed Cultivars Many cultivars exist for this species. For technical support please contact the CFAES Helpdesk. If any information in these recommendations disagrees with the label, the recommendation must be disregarded. Complete development from egg hatch to adult emergence generally takes 8 to 10 weeks. Skeletonized leaves in the spring (May-June) and heavily chewed leaves in the summer (July-September) indicate a viburnum leaf beetle … In 2002, VLB was found in Ashtabu… Soldier beetle gallery. We connect with people in all stages of life, from young children to older adults. VLB is restricted to feeding on viburnum plants in the genus Viburnum. No endorsement is intended for products mentioned, nor is criticism meant for products not mentioned. The viburnum leaf beetle (VLB), Pyrrhalta viburni (Paykull), which is native to most of Europe, consumes the foliage of plants in the Genus Viburnum to support its growth and development. VLB is likely to establish throughout Ohio. They are native to and found throughout most of Europe. Due to constantly changing labels and product registrations, some of the recommendations given in this writing may no longer be legal by the time you read them. The pits are easy break points on the stem and points where moisture loss occurs. Pictures and more information about eggs. Viburnum leaf beetle now in Michigan. Heavy attacks can result in most of the foliage being severely affected by late spring. It is always the pesticide applicator’s responsibility, by law, to read and follow all current label directions for the specific pesticide being used. These products may be sprayed when the larvae first appear in May. Heavy feeding by the larvae can result in leaf drop to total defoliation. 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). 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. Adult feeding damage consists of irregular circular holes. Beetles may have a metallic sheen appearance when observed in the direct sunlight. The egg-laying sites are often arranged in a straight row on the undersurface of the terminal twig. Back to Home. 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).
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