Canadian Department of Agriculture (1962). Semi-circular notches at leaf edges Controlling the strawberry root weevil includes a wide variety of methods such as the use of insecticides, plowing under old crops and crop rotation, cleaning farm equipment before moving to a new field, and fall plowing infested beds or fields. examples of root weevil larvae. Taxus capitataseems to be particularly susceptible to attack, giving this pest the name "taxus" weevil by the nursery and landscape industry. They are whitish, C shaped, and about 8 mm long when full grown, much smaller than white grubs. [4][5] The fine roots and sometimes even the hard fibrous roots are destroyed, allowing for the plants to be easily pulled from the soil. The strawberry root weevil adult is flightless. In late winter and early spring, larvae complete development and then transform to the pupal stage, which als… The species was first described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae. Of the root system within an inch or two of the surface of the ground. Host Plants And Distribution. Of the root system within an inch or two of the surface of the ground. Short-term relief depends on targeted treatments around the building applied by a pest management professional. Heavy infestations may cause serious injury to foliage of young conifers. Gov’t Can., Can. The adults emerge soon after and infest the above-ground parts of the plants. Female weevils lay their eggs in their food source of choice, so that the emerging larvae can feed voraciously when they hatch. Oregon State University © Ken Gray Insect Image Collection. Some of the most common Canadian weevils include the sweet potato weevil, rose weevil, alfalfa weevil, rice weevil, granary weevil, strawberry and black vine root weevils. Larvae feed on roots and can weaken or kill smaller plants. The strawberry root weevil adult is flightless. Larvae feed on roots. Strawberry plants suffered severe damage from leaf browsing in this study, but did not suffer from root weevil larvae feeding on roots. Larvae feed on roots. Both adults and larvae feed primarily upon strawberry plants but will also attack bramble and evergreens such as pine and yew. Such leaf damage is a good indication that weevils are present, but is not economically damaging to the plants. Its name comes from its affinity for strawberry plants, which form a large part of its diet. They are often found in the leaves and foliage of the plants they feed on. During late summer and early autumn black vine weevil and rough strawberry root weevil are more commonly observed indoors. The adult weevil consumes leaves while their grublike larvae chews on the roots. Otiorhynchus ovatus, also called the strawberry root weevil, is one of the many species in the weevil family (Curculionidae), occurring across Canada and the northern United States. Most weevils emerge from the soil from late May through the end of June, according to Robin Rosetta, an entomologist with Oregon State University Extension Service. The most common in the garden is the black vine root weevil or the strawberry root weevil. New York weevil (Ithycerus noveboracensis) ... Root weevil larvae can be devastating to conifer seedlings. The larval composition at a three year-old ‘Totem’ planting in Burlington was equally divided between the black vine weevil, O. sulcatus and rough strawberry root weevil, O. rugosostriatus , based on the size differences between late instar larvae … Strawberry root weevil adult. The hairy spider weevil and Trachyphloeus asperatus also tend to wander into buildings in early summer. Root Weevils: Troublesome Rhododendron Pests. The major cycle for egg production occurs with the May-June emergence of summer adults that over wintered as larvae through the winter while grazing on strawberry roots. In spring, they resume feeding and can cause extensive damage before they pupate. Symptoms. Emenegger DB, Berry RE, 1978. Serv., Ottawa, For. A one year life cycle is normal for all species. Freshly laid eggs are whitish in color but they turn brownish just before hatching. Root weevils are found in all growing areas in the northern U.S. and Canada, feeding primarily on strawberry and raspberry, but will also attack loganberry, blueberry, grapes, azalea, hemlock, rhododendron, primrose and many other ornamentals. Strawberry Root Weevils are often described as pear-shaped or light bulb-shaped, with noticeable snouts and with antennae situated partway down the snout. Strawberry root weevils, on the other hand, are common pests in strawberries and raspberries. All rights reserved. Rep. 23. The larvae of black root weevils are mature and easiest to find in April and May. Proceedings of the Zoological Society of London, 122(3):651-795. Both the strawberry root weevil larvae and adults overwinter within le… Fjelddalen J, 1953. But, weevils have six legs and ticks have eight. Larvae of root weevils are legless grubs, with a cream-colored body and a pale orange-brown head. Strawberry root weevils do not fly. Overwintering: Larvae or adults in the soil. Learn more about the types of cookies we use by reviewing our updated Privacy Policy. Using parasitic nematodes to control strawberry root weevil: The parasitic nematode, Steinernema carpocapsae, provides control of strawberry root weevil larvae in mint. This is either the larva of the strawberry crown moth (Synanthedon bibionipennis) or root weevil (Otiorhynchus spp.). Although there are different species of root weevils, they are similar in terms of their signs and symptoms, which will include the following: The larvae will feed on the root, which is why it will be the one to show the first signs of damage. On the taxonomy of Rhynchophora larvae: Adelognatha and Alophinae (Insecta: Coleoptera). The weevil is about ¼ of an inch long and dark brown in color. Generally, two generations of strawberry root weevils may occur each year. They are, however, known to feed on other plants as well. Occasionally the larvae cause serious damage to seedlings and young transplants in plantations and nurseries (Rose and Lindquest 1985). Container grown plants may be severely stunted or killed. Locating Root Weevil Larvae You can locate root weevil larvae by digging about 6 inches beneath or beside a strawberry plant. Vine weevil is a beetle that feeds on a wide range of plants, both indoors and outdoors, but can be especially damaging to plants grown in containers. Root weevil larvae can be devastating to conifer seedlings. Strawberry root weevils reproduce through a process called parthenogenesis. The larvae feed on small roots of wild and cultivated strawberries, brambles and some ornamental plants. Another control method is the use of entomopathogenic nematodes, though results have varied. Believe it or not, the one on the left is the younger specimen of the two. Since adults do not fly, plants bordering older plantings show damage the first season, with damage spreading each year the planting is kept. With a name like strawberry root weevil (Otiorhynchus ovatus), it might seem obvious which plant this destructive pest favors. Eggs are laid at random in the soil in summer around food plants, and, on hatching, the larvae feed on the roots until late fall, when they hibernate. Mixed root weevil larval populations, Burlington, WA. While these are the most common, they are far from the only kind. These adults are the first to deposit eggs the following spring. Strawberry root weevils, on the other hand, are common pests in strawberries and raspberries. Most strawberry root weevils overwinter as larvae in the soil, but a few adult weevils also overwinter in protected areas. 1994, cited orig ed 1977). They are herbivores as both larvae and adults, with the larvae feeding mainly on roots in the soil and the adults feeding on foliage or bark Strawberry root weevil (O. ovatus) Pest description and crop damage Black vine weevil (BVW) is probably the most common weevil to infest strawberries, but the strawberry root weevil (SRW) and rough strawberry root weevil (RSRW) are also pests.