It was first detected in north america in 1947 in ontario, canada. Spots may begin small, but enlarge or merge, and may be reddish to grayish brown. The viburnum leaf beetle the viburnum leaf beetle vlb, pyrrhalta viburni paykull, is an invasive species that was introduced into north america from europe. The viburnum leaf beetle vlb, pyrrhalta viburni, is an exotic invasive pest of viburnum species in the united states. It was first reported in ontario in 1947 but did not create problems until 1978 when destruction of european varieties of viburnums was observed. Paul weston, woody plant entomologist, cornell university. These fungal leaf spots on viburnum typically are angular to irregularshaped, and the leaf tissue in the spots is sunken and dry. Distribution the native range of the viburnum leaf beetle includes most of europe. Viburnum leaf beetle friends of the wild flower garden. However, damaging populations infesting viburnum plants were not observed. Valued plantings of the everpopular european cranberrybush viburnum can be especially ravaged by larval and adult feeding. Viburnum leaf beetle pyrrhalta viburni is an invasive pest from europe that is spreading in washington state.
Up until the last 2 weeks, weve only had a couple of isolated reports of viburnum leaf beetle in the state, in both dupage and cook counties. The first viburnum leaf beetle, pyrrhalta viburni coleoptera. A leaf beetle, pyrrhalta viburni paykull, commonly known as the viburnum leaf beetle vlb particularly attacks viburnums weston and hoebeke 2003a. These eggs hatch in late aprilearly may and the larvae begin feeding on the new foliage. The viburnum leaf beetle pyrrhalta viburni is an exotic leaf beetle native to europe. Both the immature and adult stages are serious defoliators of many viburnums. The first report of vlb in the united states was in new york state in 1996. It is best to start monitoring for eggs after the first frost in the fall or winter.
The impact of viburnum leaf beetle on native arrowwood. The grubs hatch in spring and nibble viburnum leaves q how do i recognise viburnum beetle a most damage is done by the grubs or larvae which are yellow, about 5mm long, with fine black lines and spots. Smart nursery owners will plant a lot of the lesssusceptible viburnums. Native plantings of arrowwood viburnum dentatum complex in the park were found to be heavily damaged by larval feeding.
New osu factsheet online viburnum leaf beetle vlb category. Photo courtesy of kent loefflercornell university the insect feeds and creates holes on the leaves of viburnums in both its adult beetle and larval stages, which doubles the damage it can do to these popular shrubs. Viburnum beetle overwinters as eggs that are deposited in the bark of stems in late summer. Weve shared several articles in in the home, yard, and garden pest newsletter about the viburnum leaf beetle. Pdf on apr 1, 2016, todd murray and others published pest watch. When fully fed in late mayjune, the larvae go into the soil to pupate.
Viburnum leaf beetle, pyrrhalta viburni, coleoptera. Larvae hatch in spring and begin to feed on the new viburnum leaves. Viburnum leaf beetle has been known in some eastern states since the early 1990s. It can cause branch dieback and even death of viburnum species, including native species and popular ornamentals. Pyrrhalta viburni is a species of leaf beetle native to europe and asia, commonly known as the viburnum leaf beetle. Vlb pyrrhalta viburni, is a recent unintentionally introduced pest of viburnum in north america. The viburnum leaf beetle only feeds on viburnum species. Larvae crawl down the stems of the bushes to pupate in the soil in june. Viburnum leaf beetle susceptibility to infestation which species of viburnum are most susceptible or relatively resistant to viburnum leaf beetles. 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. Economic impact heavy infestations by viburnum leaf beetle can defoliate shrubs, cause dieback, and eventually kill plants. Viburnum leaf beetle, pyrrhalta viburni paykull, is a chrysomelid beetle, aptly named, as it feeds on leaves of viburnum.
A variety of leaf spots are caused by the fungi cercospora spp. Just because a species is listed as most resistant doesnt mean that it won. Active populations were present in new york state, maine, and quebec canada for many years prior to that. A few possible sightings of this pest were reported in 20 an 2014. Click this article for information on viburnum leaf beetle control. Prune off basal suckers to restrict spreading if necessary. The specimens were collected on 7596 at fair haven state park in cayuga county on wild and ornamental arrowwood, viburnum spp. Adult viburnum leaf beetles are a shiny gold color, especially in the sun.
Click on any title in the list below, to view, print, or download a pdf file. This pest has been on the move ever since munching its way through native and landscape viburnums from upstate new york to northern. If you live in an area at risk for viburnum leaf beetles, savatree can inspect, prune and destroy twigs with egg masses before the eggs have a chance to hatch. This publication describes how to identify viburnum leaf beetle and gives numerous resources for home gardeners and landscape professionals to use.
Weston, department of entomology, cornell university, 2004. Smart landscape managers will start shifting their customers to the less susceptible cultivars. Viburnumvlb is native to and europewas detected in canada in 1947. Viburnum leaf beetle, pyrrhalta viburni paykull 2 1st instar larvae feeding gregariously on bottom side of viburnum leaf.
This highly destructive pest was first detected in new york state near lake ontario in 1996. Paul weston, cornell university, 2nd left and 3rd right instar larvae may feed on both sides of leaves. The viburnum leaf beetle vlb, pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage viburnum species. Chrysomelidae, found in new york state, was collected, identified, and confirmed by e. Both the larvae and adult beetles feed on viburnum leaves and can cause death to shrubs both in natural. Viburnum leaf beetle find, read and cite all the research you need on researchgate. The viburnum leaf beetle pyrrhalta viburni, native to europe and asia, was first encountered in north america in 1947, perhaps. However, getting rid of viburnum leaf beetles is far from easy. Viburnum leaf beetle pyrrhalta viburni paykull insecta. Young introduction the viburnum leaf beetle vlb, pyrrhalta viburni paykull, which is native to most of europe, can cause severe damage and possibly death of ornamental viburnums. Susceptibility ratings to viburnum leaf beetle of common species of viburnum paul a. However, specimens had been collected in annapolis royal, nova scotia in 1924. Pests and potential problems the viburnum leaf beetle pyrrhalta viburni was introduced from europe and asia to north america around 1947. Both the larvae and adult feed voraciously on the foliage.
The viburnum leaf beetle, first found in north america in 1947 in the niagara peninsula of ontario, canada. Q what is viburnum beetle a an inconspicuous beetle that nibbles holes in viburnums when its both a grub and an adult caption. Both adults and larvae feed on the foliage of the host plant. The damage potential from the beetle is quite extensive, if not managed. Paul weston, cornell university, old viburnum twig with empty egg cavities, caps missing. Viburnum opulus, european highbush cranberry and its selections. Species that are known to be the most susceptible to viburnum leaf beetle damage include. Wasps factsheet on stinging insects from cornell cooperative extension. Viburnum leaf beetle the viburnum leaf beetle, pyrrhalta viburni vlb, was first found in north america in 1947 in ontario, canada.
This beetle, which is native to europe and asia, was first detected in north america in 1947 in ontario, canada, but established breeding populations were noticed only in 1978 in the ottawahull. The beetle feeds exclusively on many different types of viburnum. The viburnum leaf beetle vlb pyrrhalta viburni order coleoptera. Chrysomelidae the viburnum leaf beetle was officially identified in massachusetts in the summer of 2004. Occasional pruning is helpful to rejuvenate and shape the plant. Leaf beetles can skeletonize viburnum leaves quickly and efficiently. Do plant defenses predict damage by an invasive herbivore. Viburnum leaf beetle pest alert wisconsin horticulture. Chrysomelidae images by timothy abbey, richard cowles and rose hiskes the viburnum leaf beetle was first found in connecticut in 2004.
Vlb was first discovered and identified in north america in 1947 in the niagara peninsula of ontario, canada. The impact of viburnum leaf beetle on native arrowwood paul a. It was first detected in 1947 in the niagara peninsula of ontario, canada, and then in. Chrysomelidae 4 management mechanical control the best management option for vlb is to prune and destroy the infested twigs and branches during the winter. To safeguard your susceptible shrubs, your best bet is to take preventative viburnum leaf beetle management measures. In 1996 it was discovered in a park in new york, where native plantings of arrowwood viburnum dentatum complex were found to be heavily damaged by larval feeding. Viburnum leaf beetle management and prevention options. Viburnum leaf beetles overwinter as eggs on the previous years new stems. The factsheet covers the viburnum leaf beetle, an invasive species from europe and asia. Larvae are pale yellow to pale green with black dots and are about 14 inch long when mature. The viburnum leaf beetle vlb, pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage species. The viburnum leaf beetle vlb is an invasive insect pest native to eurasia that was probably brought into north america on imported nursery plants in the early 1900s. The viburnum leaf beetle, first found in north america in 1947 in the niagara peninsula of ontario, canada, was discovered in new york state in northern cayuga county fair haven beach state park in july 1996.
Idl factsheets insect diagnostic laboratory at cornell. Vlb is native to europe and was detected in canada in 1947. Viburnum leaf beetle university of maryland extension. There is a new ohio state university extension factsheet that you must check out.
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