The Viburnum family includes a large, diverse group of deciduous and evergreen shrubs and small trees that are hardy and grown as ornamental plants. The viburnum leaf beetle (VLB), Pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage species. It was first found in upstate New York in 1996. 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. Viburnum leaf beetle larvae and damage. Viburnum leaf beetle, Pyrrhalta viburni (Paykull), is a chrysomelid beetle, aptly named, as it feeds on leaves of viburnum. The 1/3 inch long larva has noticeable black spots on their beige to yellow-green bodies. The viburnum leaf beetle (VLB), Pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage Viburnum species. Skeletonized leaves in the spring (May-June), heavily chewed leaves in the summer (July-September), … Viburnum Leaf Beetle. After mating, females implant eggs in small pits chewed into Viburnum twigs and cover the eggs with chewed wood. When population levels of the insect increases, defoliation of the shrub becomes more obvious. Larvae and eggs of the leaf beetle Pyrrhalta viburni were investigated for protective devices against predators. shrubs have fallen, if the viburnum leaf beetle (Pyrrhalta viburni) was present earlier this year, the eggs laid on the shrubs newest growth will be evident.This non-native invasive species feeds as both a larvae and adult, skeletonizing the viburnum leaves. The eggs of the Viburnum leaf beetles overwinter in twigs, and hatch in May as larvae. And they will remain active from spring to fall impacting the foliage of the species like the Arrowood and Alleghany viburnum. Viburnum leaf beetles overwinter as eggs deposited onto the branches of the viburnum plant. They hatch in May, and the larvae begin to feed on the leaves that are emerging for spring. While the leaves of viburnum (Viburnum spp.) The larvae feed on the leaves of the plant, and in June, move into the soil to pupate as you have observed, with adult beetles emerging in late July. The damage potential from the beetle is quite extensive, if not managed. Species that are known to be the most susceptible to Viburnum leaf beetle damage include: the V. dentatum complex (arrowwood viburnums), V. opulus (European cranberry bush), V. opulus var. He writes and lectures extensively and has written five gardening books, including Compost and No Nettles Required. Also, magnified larva brought in … Both the adult beetle and their larvae feed on many types of viburnums. VLB is native to Europe and was detected in Canada in 1947. ... Larvae hatch from the eggs in the spring mid-late April. Photo: Milan Zubrik, Forest Research Institute - Slovakia, Bugwood.org: Adults are brown and nondescript and are only about ¼ inch long. The adult yellowish-brown beetles are ¼ long. Adult VLB Photo: Paul Weston, Cornell University. americana (American cranberry bush, and V. … Keep in mind insecticides provide little control to eggs, or when you see the adults feeding. Repeated defoliation stresses the shrub and can lead to its death within 2 – 3 years. Adult feeding causes oblong holes in viburnum leaves while larvae skeletonize leaves (similar to Japanese beetles).This species overwinters as an egg; larvae emerge in May to feed through June. Viburnum beetle larvae can grow up to 8mm in length Image: Kazakov Maksim Viburnum beetles are visible on infested plants in both of their growth stages. A single female may produce 500 eggs. Viburnum beetle ( Pyrrhalta viburni ) Viburnum beetle is a serious pest of several species of viburnum. When larvae are present on leaves 2% applications of insecticidal soap or spinosad (Captain Jack’s Deadbug) will kill larvae. Viburnum Leaf Beetle. Larvae of the viburnum leaf beetle are less than a half inch long when mature, slightly depressed and subcylindrical. PJ Liesch, UW Insect Diagnostic Lab . Control of the Viburnum Leaf Beetle. Viburnum leaf beetle identification and damage Larvae hatch from overwintering eggs in May. Without the use of pesticides to protect susceptible varieties, the bushes are doomed, says an entomologist at Cornell University, New York state's land-grant institution. Both adults and larvae feed on viburnum leaves, ensuring a long season of continuing damage. Leaf sample brought into a local MSU Extension office, demonstrating damage from feeding of viburnum leaf beetle larvae. Viburnum beetle overwinters as eggs that are deposited in the bark of stems in late summer by the beetles. Most beneficial insect packages come with care instructions, but those ordering adults usually need do little more than open the box in the garden. The adult Viburnum leaf beetle is a yellow-brown color and around 1/4 inch long. The grubs cause more significant damage than do the adults. They are found in the soil around the viburnum roots. A couple of least toxic organic insecticides that kill many viburnum leaf beetle larvae, yet least harm beneficial insects, are insecticidal soaps and products containing the fungus Saccharopolyspora. Some beneficial insects, such as adult lady beetles, lacewing larvae and adult spined soldier bugs, feed on Viburnum leaf beetle larvae. The larvae then emerge in April / May to feed on the leaves, before dropping to the floor and pupating in the soil emerge as adults in late summer. Root weevil larvae cause damage by chewing and girdling roots, and damage usually begins in spring to early summer and continues through the growing season. Pyrethrum is the best organic spray, although the adults, which turn up to feed later in summer, are most effectively controlled using something like Bayer Sprayday Greenfly Killer. This pest has been on the move ever since munching its way through native and landscape viburnums from upstate New York to northern Pennsylvania. The viburnum leaf beetle (VLB), Pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage Viburnum species. ViburnumVLB is native to and Europewas detected in Canada in 1947. Back to Leaf Beetles. The pests can completely defoliate a virbunum. These eggs hatch in late April-early May and the larvae begin feeding on the new foliage. These two methods are preferred because they spare many of the beneficial insects that can attack and manage populations of the viburnum leaf beetle. The damage starts as small holes in the leaves, and as they continue to feed, the lamina, or flesh of the leaf gets stripped away, leaving just the veins. These beneficial insects can be purchased from commercial sources. The first report of VLB in the United States was in New York State in 1996. Tattered viburnum leaves that resemble lace more than foliage, are symptoms of viburnum leaf beetles (Pyrrhalta viburni). Given the timing, it is the larval stage of this insect that you have observed. Viburnum beetle overwinters as eggs that are deposited in the bark of the current years growth of viburnums in late summer. Scientific Name: Pyrrhalta viburni Common Name: Viburnum leaf beetle Known Hosts: The viburnum leaf beetle only feeds on Viburnum species. When fully fed in late May-June, the larvae … PJ Liesch, UW Insect Diagnostic Lab . The eggs overwinter and hatch into larvae in spring. Larvae feed gregariously on viburnum foliage. The larvae of each of these beneficial bugs will consume viburnum beetle larvae, and the predatory adults will consume the pestilent adults. Viburnum leaf beetle larvae and damage (photo courtesy of Bruce Watt, University of Maine, Bugwood.org) Viburnum leaf beetle adults (photo courtesy of Paul Weston, Cornell University, Bugwood.org) Feeding is limited to species of viburnum. Selected reference: Weston, P.A., G. Desurmont, and E.R. VLB is native to Europe and was detected in Canada in 1947. The invasive viburnum leaf beetle and larvae have been noticed devouring shrubs in Michigan. The larvae are flat and yellow with brown spots and hatch in mid-May to feed on newly formed leaves; the feeding larvae skeletonize leaves. There are three larval stages (instars). Viburnum beetle (Pyrrhalta viburni) larva. The first report of VLB in the United States was in New York State in 1996. tors attack adults and larvae of viburnum leaf beetle on this side of the Atlantic. The larvae are white, legless grubs with a brown head and C-shaped appearance. 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. The viburnum leaf beetle. Read on for information about the viburnum leaf beetle lifecycle and viburnum leaf beetle control. VLB (Pyrrhalta viburni), is a recent unintentionally introduced pest of viburnum in North America. Viburnum beetles target plants like the Snowball, Cuyuga and Burkwood viburnums. The larva of these leaf beetles can skeletonize viburnum leaves quickly and efficiently. Viburnum beetle larva: The larvae feed in late spring (mid April to early May) and that's the time to zap them. The first report of VLB in the United States was in New York State in 1996. Distribution The native range of the viburnum leaf beetle includes most of Europe. The larvae attack the leaves, causing severe defoliation of plants. Viburnum leaf beetle adults are present during mid-summer and consume Viburnum leaves. The larvae are yellow-green, 1/3 inch long, and have a series of black dots and stripes on their back. 2007. The adult beetle also causes damage by chewing elliptical holes in the leaves. Viburnum leaf beetle larvae are voracious leaf eaters, feeding on the areas between the veins creating a “skeletonized” appearance. The emerging larvae are greenish-yellow and feed gregariously on the underside of tender, newly expanding viburnum leaves skeletonizing the foliage. Like adults, the larvae feed on Viburnum leaves. Viburnum Leaf Beetle Lifecycle . Adults and larvae of multicolored Asian lady beetle and larvae of lacewings will eat considerable numbers of viburnum leaf beetle larvae, and spined soldier bugs will eat both larvae and adults of viburnum leaf beetle. 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