Large, leathery, dark green, glossy leaves and clusters of extremely fragrant, small, white flowers, completely covering the plant in springtime, make Sweet Viburnum a longtime landscape favorite. Removing light infestations can be as simple as pruning the aphid-bearing twigs or manually scraping the pests from the undersides of the shrub’s leaves. Although there are many types of aphids, snowball aphids, bluish-grey pests that look like they’ve been lightly dusted with white powder, are a particular enemy of viburnum and certain types of cranberry bushes. The viburnum leaf curl aphid's eggs overwinter on the shrubs' buds and twigs. The development of brown leaves on a prized plant can be a worrying discovery. The large, dull green leaves form a moderately coarse texture. Prevention & Control: They usually cause little or no appreciable damage. Inspect the stems of unhealthy-looking plants for possible scale infestations. The tiny insects are easy to miss at first... Thrips and Leaf Curl in Viburnums. Cover the leaves thoroughly, both the tops and undersides. Inspect the stems of unhealthy-looking plants for possible scale infestations. Previously viburnums were included in the plant family Caprifoliaceae; however, recently they have been moved into the family Adoxaceae, along with elderberries (Sambucusspecies). The Snowball, Viburnum opulus var sterilis, is an attractive, sterile, shrub with large white flowers. The individual florets grow in clusters usually found at the ends … Pesticides and other toxic chemicals kill beneficial insects and create an atmosphere in which harmful pests can flourish. Neither pesticide, however, leaves toxic residue. Aphids are common hibiscus pests. looks as though it is dead. Leaves curl and turn a reddish purple color as disease progresses late in … How do I treat it? They usually cause little or no appreciable damage. Viburnum leaf beetle, native to Europe, was first reported in Michigan in 2008. For two seasons, when the leaves develop, leaf curl sets in and has damaged a viburnum shrub. When viburnum leaves are curling, there’s a good chance that pests are to blame, and aphids are the usual suspects. Leaf curl is a fungal disease that can attack various fruit tree varieties, but is most prevalent on peach and nectarine trees. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. These tiny insects are usually black, brown, pink or red and are most often seen underneath hibiscus leaves. Depleted leaves curl, yellow and distort. Leaf Curl. The leaf-rolling … Fruit is similar to that of Viburnum opulus but is used for preserves and jellies. These aphids are gray to dark green and feed in clusters at the tips of the branches, causing leaf curl. Asked June 8, 2016, 11:55 AM EDT. Insecticidal soap sprays and horticultural oils aren’t as harmful because they kill only on contact and have no residual effect. Do you think whatever happened to the parent plant has transferred to its cutting? Applying a high-volume spray of water and neem oil or insecticidal soap to your viburnum's foliage kills aphids present on the shrub. The insects can be dislodged with high pressure water spray from the garden hose. How far back should I prune them? Leaves look much like those of Viburnum opulus; they emerge reddish tinged, mature to dark green, turn yellow to red-purple in fall. Viburnum species are attractive flowering shrubs. Passionate for travel and the well-written word, Judy Wolfe is a professional writer with a Bachelor of Arts in English literature from Cal Poly Pomona and a certificate in advanced floral design. Viburnum opulus is especially susceptible. Guelder Rose Viburnums – How To Care For Guelder Rose Plants The creamy-white, flat-topped flowers in May, black fruit in fall, persisting into winter, and excellent pink to dark burgundy fall color add year-round interest. 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