include black vine weevil, strawberry roof weevil,-woods-weevil,-and clay-colored-weevil. Cause: Adult root weevil (Fig. [1, 2 ], a species endemic to the Pacific Coast of North America and an important pest of Rhododendron in that region. Figure 2: Strawberry root weevil feeds on many different kinds of plants. Figure 1: Black vine weevil feeding on hops plant at night. Box 248 Windsor, CT 06095 Phone (860)683-4983 Fax (860)683-4987 Email Richard.Cowles@po.state.ct.us These tiny organisms attack the root weevil larvae as they grow in the soil below the shrubs. Germacrone was found to be an obscure root weevil … The leaves of the plant will be irregular, as though someone has been taking bites out of the edges. Root Weevil on Rhododendrons Obscure root weevil (Sciopithes obscures), black vine weevil (Otiorhynchus sulcatus), and woods weevil (Nemocestes incomptus) are the three most important … An adult root weevil, an immature grub, and Adults range from 1/4-1/2 inch long. See: Common Pests of Nursery Crops. Root Weevils: Troublesome Rhododendron Pests Hank Helm Bainbridge Island, Washington Perhaps the worst insect pests that attack rhododendrons are the several species of weevil, found in nearly all areas of the world. In some areas, root weevils are a nuisance when they come inside seek-ing shelter during hot dry weather. Horticultural, Landscape, and Ornamental Crops (2.84 MB) Hosts and Pests of Nursery Crops. Root weevil pests can be controlled in two ... general refer to the Pacific Northwest Pest Management Handbook, The Pacific Northwest Nursery IPM and The American Rhododendron Society website. Family name: Curculionoidea Size: Varies, 1/4″ and up Color: Black or brown, beetles have a snout Introduction: Root weevils are a large group of snout-nosed insects that are exceedingly frustrating and elusive in the garden. and others) normally feed at night. A Native species, S.obscurus is found in the Pacific Northwest from Monterey Bay, California, to Root weevils (Otiorhynchus spp. Contact Us. Check susceptible plants frequently onwards so action can be taken before a damaging population has developed. Caption: Root weevil damage on rhododendron. Photo by R. Rosetta. While root weevil larvae (Fig. The leaf edges dry out and die. Weevils attack over 100 different plant species in addition to rhododendrons. Root rot is a disease caused by fungi such as pythlum and botryosphaeria, both of which result in root decay in rhododendrons. P. O. (I’m not saying they came from your freshly purchased potting soil….root weevil just walk from one plant to another and lay their eggs.) There are all kinds of weevil pests, such as strawberry root weevils, lilac root weevils and even one called the hairy spider weevil, which sometimes wanders harmlessly into buildings. Rhododendron … Many different problems can result in the same aboveground symptoms as Phytophthora root rots. Nei-ther do they harm people and pets. This reduces populations before they become adults. Rhododendron (Rhododendron)-Root weevil. Otiorhynchus ovatus, the strawberry root weevil, is one of the many species in the weevil family (Curculionidae), occurring across Canada and the northern United States.The species was first described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae.Its name comes from its affinity for strawberry plants, which form a large part of its diet. There are 4 or 5 different root weevil species including black vine, strawberry and obscure. Windburn and winter injury on rhododendron and azalea leaves are common on plants growing in windswept locations. This damage will appear in the night, as root weevils come out to feed at night. INTRODUCTION A number of lepidote (scaled) Rhododendron species are resistant to foliar feeding by the obscure root weevil (Sciopiithes obscuru.s Horn.) Alder (Alnus)-Alder flea beetle; Alder (Alnus)-Aphid; Antonelli : Rhododendron : Root weevils (revision date: 3/10/2017) Use Integrated Pest Management (IPM) for successful plant problem management. Root Weevil Feeding on Rhododendron: A Review Robert P. Doss Horticultural Plants Research Unit, USDA-ARS, Western Washington Research and Extention Center, Puyallup, WA 89371 Root weevil larvae, pupae and adults on soil surface. One major symptom of root rot is browning leaves that eventually fall off. Root weevil larval girdling on rhododendron trunk. What are root weevils? Nematodes are microscopic round worms. By mid-July much of the foliage is affected, with … Root Rot. This rhody has fine hairs on the leaves so root weevil rarely bother it. The plants that the strawberry root weevil feeds on include strawberry, raspberry, rhododendron, grape, and peppermint and they have also been known to feed on grasses. Management: Inspect for adult weevils at … Limiting root weevil damage Use beneficial nematodes The least toxic method to control weevils is to treat them in the larval stage, using beneficial nematodes. 7) feed on rhododendron roots, they also feed on a wide variety of other plant roots. Figure 3: Rough strawberry root weevil. Root Weevil on Rhododendrons Integrated Pest Management 1. The author discusses the results of the rhododendron study and addresses the importance of studying plants resistance to insects. They vary in height and shape, but all produce a plethora of blooms that are perfect for shady, acid-rich areas in the garden. Several species of weevils feed on rhododendrons. Expt. 2) feed-ing. Root weevil prefer part shade to shade loving plants. Studies were conducted to test the resistance of rhododendron species to foliar feeding by the obscure root weevil. … Pesticides registered for root weevil control will normally reduce aphids and many other leaf Fig. It’s a slower growing variety and can take more shade than the other two I have listed but not deep shade. Back to Home. Figure 4: Black vine weevil. Figure 5: Lilac root weevil and associated leaf notching on peony. They also can be common nuisance invaders of buildings, particularly during hot, dry weather. Strawberry bud weevils are also sometimes called strawberry clippers. Station, Valley Lab. American Rhododendron Society: Practical Black Vine Weevil Management University of California Statewide Integrated Pest Management Program: Root Weevils Related Articles Root weevil larvae feed on roots and tend to be most active in winter and spring. Adults are 5-8 mm long with a hard shell, and are wingless. Sciopithes obscurus, Otiorhynchus sulcatus. The larvae are of extreme concern in potted plants where there is nothing available except the resident plant's roots. Host Plants And Distribution. Root weevil stages and damage shown in color. Root Weevil Control. Photo: John Davidson, University of Maryland. Vine weevil is a very widespread insect in Britain. If you suspect root weevil larvae damage, look at the trunk of the shrub 1/2 inch below the soil. Rhododendron ‘Clipiense’ is my best weevil resistant compact rhododendron for shadier situations. These feeding insects as well. Adults are commonly called weevils or snout beetles. Their damage can be confirmed by checking plants at night with a flash-light for the presence of the weevils. Other weevils may also notch rhododendrons. If weevils are bothering you inside your house, remember that they don’t dam-age your home or your furniture. 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