Strawberry root weevil adult. 7) feed on rhododendron roots, they also feed on a wide variety of other plant roots. P. O. 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. Research was conducted on the obscure root weevil (Sciopithes obscurus), the main foliar feeding root weevil in Oregon, on rhododendrons in an effort to determine the biology and control for the weevil. Aboveground symptoms are useful but not completely diagnostic. Station, Valley Lab. Root Rot. Figure 2: Strawberry root weevil feeds on many different kinds of plants. Rhododendron varieties with resistance to weevils are available and include species such as Rhododendron cuneatum, R. dauricum, R. fastigiatum, and others. Nei-ther do they harm people and pets. One major symptom of root rot is browning leaves that eventually fall off. This damage will appear in the night, as root weevils come out to feed at night. Lacebugs on rhododendron. 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. Pesticides registered for root weevil control will normally reduce aphids and many other leaf Fig. Root Weevil Control. Rhododendron ‘Clipiense’ is my best weevil resistant compact rhododendron for shadier situations. What are root weevils? Expt. Symptoms of Phytophthora Disease. 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. Horticultural, Landscape, and Ornamental Crops (2.84 MB) Hosts and Pests of Nursery Crops. Figure 1: Black vine weevil feeding on hops plant at night. The leaves of the plant will be irregular, as though someone has been taking bites out of the edges. Weevils attack over 100 different plant species in addition to rhododendrons. Many different problems can result in the same aboveground symptoms as Phytophthora root rots. Rhododendron (Rhododendron)-Root weevil. (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.) Box 248 Windsor, CT 06095 Phone (860)683-4983 Fax (860)683-4987 Email [email protected] These feeding insects as well. Root weevil prefer part shade to shade loving plants. Figure 3: Rough strawberry root weevil. … It’s a slower growing variety and can take more shade than the other two I have listed but not deep shade. A Native species, S.obscurus is found in the Pacific Northwest from Monterey Bay, California, to 2. An adult root weevil, an immature grub, and In some areas, root weevils are a nuisance when they come inside seek-ing shelter during hot dry weather. Gardeners with vine weevil should keep up their guard because stopping control measures after the apparent disappearance of the weevil can allow numbers to build up again. Because of this omnivorous feeding habit, larval damage is not very often critical in the average landscape. Root weevil stages and damage shown in color. Root rot is a disease caused by fungi such as pythlum and botryosphaeria, both of which result in root decay in rhododendrons. Germacrone was found to be an obscure root weevil … Lacebugs can cause damage on rhododendrons. Nematodes are microscopic round worms. white pine weevil whiteflies woolly alder aphid new woolly ash aphid woolly beech aphid. [1, 2 ], a species endemic to the Pacific Coast of North America and an important pest of Rhododendron in that region. 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. Download entire section. They vary in height and shape, but all produce a plethora of blooms that are perfect for shady, acid-rich areas in the garden. 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. Online Only Descriptions cover five root weevils that cause most damage on rhododendrons in the Pacific Northwest. 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