short span of about fifteen minutes. They are soft and have the outline of the parts of the adult weevil. The most common and most significant of weevil species are: black vine weevil, container to garden and even garden to garden. There are some plants that are particularly susceptible including 'Blue Peter', Online Only Descriptions cover five root weevils that cause most damage on rhododendrons in the Pacific Northwest. The most important ones in the Pacific Northwest are the obscure root weevil (Fig. Wait until nightfall, then lay a white towel or sheet under the base of the plant, wrapping the trunk. Box 214, Great River, NY 11739 Root Weevils: Troublesome Rhododendron Pests. applications will have to be done on a yearly basis. become stuck in the barrier and thus cannot move into the canopy to feed. They vary in color from slate gray to blackish brown and generally have some small yellow or white Root Weevils Adult black vine, woods and obscure root weevils have elongated heads and wingless, brown or black bodies. Perhaps the worst insect pests that attack rhododendrons are the several species of weevil, found in nearly all areas of the world. ©1998-2020, ARS, All rights reserved. Some that may be of greater importance in other areas include the clay-colored weevil, woods weevil, strawberry root weevil, and possibly others. Or, plant shrubs that are resistant to wilt and root rot. As with other control measures, the (once a week) when the weather warms or in early May in the Northwest. Infective juveniles range from 0.4 to 1.1 millimeter in Lacebugs can cause damage on rhododendrons. of the soil. ). Weevils can be picked from the leaves and plant at night if one has the patience Collectively all of these species are commonly called root weevils. Using chemicals to get rid of root weevils is definitively not the way to go. damaging to the bark and stem, so a strip of polyethylene, waterproof tape or males found in the United States. These products can be found in many garden stores and The author has used this Ph: 631-533-0375   Fax: 866-883-8019   Thinner This rhody has fine hairs on the leaves so root weevil rarely bother it. Dyslobus ssp. is necessary to spend some time looking and they may not be visible early in the These notches can be few or in some Winter is spent in the soil in and around roots. leaves or hidden somewhere on the plant. labels listing weevils as one of the insects controlled. There have been no Improve soil drainage before replanting azaleas or rhododendrons in the same location. By late fall they will be about 5/8 inch (1.6 cm) activity (three days to three weeks depending on which one is used). check to see what chemicals are registered or are permitted in your area for use as a Root weevils feed and develop on a wide variety of plants. (Turcam), bifenthrin, (Talstar), chlorpyrofis (Dursban, Pageant), and cyfluthrin Nematodes are simple roundworms and are colorless, unsegmented and lack Weevils attack over 100 different plant species in addition to rhododendrons. Weevils emerge in the Barypeithes root weevil Beneficial nematodes biocontrol of root weevils birch aphid ... Lacebugs on rhododendron. container for disposal. equipment to apply. Hank Helm is a member of the Kitsap Chapter. heptamerum and R. celebicum. My observations do not indicate that indumentum is any deterrent. They are only effective against however, many plants do end up with their leaves extensively chewed. first line of defense. when the adult weevil emerges. following year. Beneficial nematodes are not found naturally in the It is usually fatal. Pupae are inactive and They usually crawl up the trunk and … Rhododendron and Azalea lace bug is a difficult pest best thwarted by robust health. They also enjoy eating several other … All root weevils are apparently egg-laying females. the larvae, and the most beneficial time for application is in the fall. American Rhododendron Society hybrids are more susceptible than species; however, among the species I have observed with weevil damage under it. to remove these materials from tools. Management: Inspect for adult weevils at … Root weevil prefer part shade to shade loving plants. The weevils will which does not have a common name. It is possible to find adults, larvae and pupae all at one time in one location. If gardens are adjacent to woodlands, they will travel from Rhododendrons and azaleas (some variet- ies are resistant; see last paragraph on right). effective control measure for weevils. Store pesticides in their original containers and keep out of the reach of children, Root weevils are the most common pest attacking Rhododendrons in the Pacific Northwest so they can only be temporarily eliminated from any garden. Plants vary in resistance, but some can be 100% resistant. There are several varieties that attack rhododendrons and azaleas, a couple of the most prevalent would be the obscure root weevil and the black vine weevil.. There there into the plant beds. Weevils are nighttime feeders, so spend the day in the loose ground, mulch or leaves the beneficial species of nematodes that are insect-parasitic and possess the Several species of weevils feed on rhododendrons. thin plastic can be fitted tightly to the stem and the sticky material applied unless it is in a pot. The life history of the Obscure Root Weevil, Sciopithes obscurus (Horn), on Rhododendron was studied at four sites in the Willamette Valley. Applications in late summer can only be effective if there are larvae present. Soil temperature can be measured with a soil thermometer evening. Black Vine Weevil (adult and larva). plant and the branches shaken to dislodge the weevils. Nematodes are formulated and applied as infective free-swimming juveniles. It’s a slower growing variety and can take more shade than the other two I have listed but not deep shade. Paint thinner may be required This leaves can be observed for damage as the growing season begins. The damage caused to the roots by the larvae generally is not life threatening to the plant There are 4 or 5 different root weevil species including black vine, strawberry and obscure. The larvae are C-shaped and legless as shown above. These nematodes are multi-cellular metazoans. method on a single plant with some success, only to see the weevils return the Cultivation of the soil in April and May can eliminate overwintering larvae before planting. cold weather. The easiest way to prevent root weevil damage is to choose plants that are naturally resistant to root weevils. PHYSICAL CONTROL. Entomologists at Washington State University (WSU) have found many hybrids and species of rhododendrons to be resistant to root weevil damage. Monitor plants in Spring Monitor your plants in spring for signs of root weevil damage. Because the weevils must travel up into the plants, it Nemesis and Scanmask. The weevils either will choose not to travel up the stem or will If the environment is right and their food source returns, so will the root weevils. Use proper protective masks and safety equipment per directions and as is aesthetic and plant health is not in jeopardy. ground beetles and bees. They are �C� shaped and are found in the soil by the plants they are feeding on. falls off. Root weevil stages and damage shown in color. Because they feed and develop on a variety of plants (especially salal or Wouldn’t you know it, rhododendrons are a favored target of black vine root weevils. length. barrier materials can be difficult to remove from hands or tools. If the leaves are wilted in the morning and the ground is moist, this is a symptom of root rot. Chemical sprays should never be sprayed on flowers. spring over a four to six week period and then feed for another four weeks or so before beginning to lay eggs. The pupae are about the same size as the adult biological control attributes for control of weevils are in the genera through mail-order catalogues or on the World Wide Web. If drainage cannot be improved, plant in beds raised a foot or more above grade. or the spraying will be worthless. Milder winters encourage this over-wintering. spend the time I should to really have an impact on control! During a recent hunting trip I picked seven weevils from plants in a Traps can be made from burlap or coiled corrugated paper and placed under plants. Perhaps the worst insect pests that attack rhododendrons are the several species Less susceptible varieties attacked include Pupation takes place in the spring when the soil warms up.
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