However, repeat sprays may be needed for adults in July if adults migrate back into plantings. The Impact of Viburnum Leaf Beetle on Native Arrowwood. Photo courtesy of Kent Loeffler/Cornell University The insect feeds and creates holes on the leaves of viburnums in both its adult beetle … Viburnum leaf beetle now in Michigan. 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. 2005. Columbus, Ohio 43210 Mated female viburnum leaf beetles chew pits into the bark of twigs and stems of the host shrubs into which eggs are laid. VLB overwinters in the egg stage in the pits in which they were laid. All are currently susceptible to the Viburnum Leaf Beetle. VLB is restricted to feeding on viburnum plants in the genus Viburnum. | Columbus, Ohio 43210. Hoebeke. Contact your county OSU Extension office for more information. Thorough coverage of plant foliage is needed as these pesticides only kill by contacting the insects. A summary of those mostly found in Ohio: Several insecticides include VLB on their labels. Newly hatched larvae tend to feed side-by-side on the underside of the leaves between the veins of the leaf. Pruned twigs should be removed from the area and buried, burned, or placed into an active composting pile. See the pupae in Figure 4 below. When disturbed, the beetles will fly away or drop to the ground. The author and Ohio State University Extension assume no liability resulting from the use of these recommendations. From summer through fall, adults will continue to be active, mating, laying eggs on terminal twigs, and feeding upon foliage until the first killing frosts. CFAES provides research and related educational programs to clientele on a nondiscriminatory basis. Pest Alert: Viburnum Leaf Beetle The viburnum leaf beetle, Pyrrhalta viburni (Paykull), was first found in North America in 1947, in the Niagara Peninsula of Ontario, Canada. The adult beetle also causes damage by chewing elliptical holes in the leaves. 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). They're recently been discovered in British Columbia. There is concern that the residues of these insecticides will end up in the nectar or pollen and harm pollinators. Murray, T. 2004. VLB is likely to establish throughout Ohio. A female can lay up to 500 eggs. Phone: 614-292-6181, © 2020 | 2120 Fyffe Road | Room 3 Ag Admin Bldg. After leaves are no longer providing enough sustenance, larvae will move to the new, green-stem growth and chew the bark off of the young stems causing stem dieback. In this case, use a contact insecticide in the pre-bloom period for control of the larvae and then use a systemic after flowering to control the adult beetles. When a female lays eggs, she will typically chew pit after pit in the young stems. Pictures and more information about larva damage. Both adults and larvae feed only on leaves of viburnum species. Eggs are ball-shaped, yellow-brown to brown in color with a sculptured surface and about 1/16" in diameter. 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. Adults also feed on the leaves of host plants as seen in Figure 6 below. Viburnum beetle can defoliate viburnums. The capped egg pits are easy to see on the stems after leaf-drop. If you have a disability and experience difficulty accessing this content request accommodation here. Valued plantings of the European cranberrybush viburnum can be severely damaged by larval and adult feeding. In 2002, VLB was found in Ashtabu… GTR-NE-337. The sheen is produced by short, golden-grey hairs. Multiple defoliations can weaken and/or kill host plants. Heavy attacks can result in most of the foliage being severely affected by late spring. Repeated defoliation stresses the shrub and can lead to its death within 2 – 3 years. Horticultural oils (generally 2 to 3 percent) and/or insecticidal soaps are useful for control of VLB larvae. Figure 5. Complete development from egg hatch to adult emergence generally takes 8 to 10 weeks. This site designed and maintained by CFAES Marketing and Communications. Figure 3: Viburnum leaf beetle third instar larva. ... Viburnum Leaf Beetle preferred: UKSI Guelder-Rose Leaf Beetle: UKSI Classification unranked Biota kingdom Animalia … 2120 Fyffe Road | Room 3 Ag Admin Bldg. For technical support please contact the CFAES Helpdesk. Figure 7. Once larval feeding is complete, larvae abandon the host plant, transverse down the plant to the soil, enter the soil and pupate. These rows of capped pits can be observed from July through the following spring. Pest Alert: Viburnum Leaf Beetle. Death of the young stems may occur through the winter. As of 2015, VLB has spread into British Columbia, Canada, and portions of Connecticut, Illinois, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Vermont, Washington and Wisconsin (Liesch 2015, Murray 2004, Tiddens 2015, Weston et al. In 2015, the beetle was reported across the Chicago region with some regularity. Adult females lay up to 500 eggs on viburnum twigs in summer and early fall. These same insecticides may also have to be used later in the season in order to eliminate any adult beetles that have flown in from untreated plants. An adult viburnum leaf beetle is between 4.5 and 6.5 mm long. Viburnums, including American cranberrybush viburnum, arrowwood viburnum… Copyright © 2016, The Ohio State University, Curtis E. Young, PhD, Assistant Professor, Extension Educator, Agriculture and Natural Resources, Van Wert County, © 2020 The Ohio State University, College of Food, Agricultural, and Environmental Sciences, http://waukesha.uwex.edu/files/2015/06/Viburnum-Leaf-Beetle-Factsheet.pdf, http://whatcom.wsu.edu/ch/documents/newsletter/WD_2004_06.pdf, http://my.chicagobotanic.org/news/pest-alert-viburnum-leaf-beetle/, http://www.guelphlabservices.com/files/PDC/002VibernumLeafBeetle.pdf, http://www.hort.cornell.edu/vlb/news/2003report.pdf. For more information, visit cfaesdiversity.osu.edu. Watch the plants carefully as the adults can move into an area from July through September. The pupal stage lasts 10 to 14 days. 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. They are native to and found throughout most of Europe. Weston, P. A. 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. No damage occurs during the pupal stage. These products may be sprayed when the larvae first appear in May. 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. CFAES COVID-19 Resources: Safe and Healthy Buckeyes | COVID-19 Hub | CFAES Calendar. If any information in these recommendations disagrees with the label, the recommendation must be disregarded. 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. 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. Weston (2003) classified a number of common viburnum species into categories of most susceptible, moderately susceptible, and least susceptible species based on a multitude of field observations. Contact Us. A listing of offices is available at extension.osu.edu. VLB has a complete life cycle with four distinct stages: egg, larva (3 larval instars), pupa and adult. 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. Fact Sheet, University of Guelph. By early to mid-May, the eggs hatch and the larvae (grubs) disperse to the newly expanding viburnum foliage. The beetle’s wide distribution, particularly in western North America, increases the likelihood of this pest expanding its range in the Pacific Northwest. This damage becomes more exaggerated as the leaf continues to mature and expand resulting in the skeletonized areas ripping out from between the veins, leaving only midribs and major veins intact.
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