|scientific name Otiorhynchus |
Adults live under foliage, in crowns of plants at base of leaf stems, and larvae live in the ground.
Usually overwinter as larvae, but adults may diapause in warmer climates (Warner and Negley 1976).
Sixteen species are established in North America, and only Otiorhynchus sulcatus and Otiorhynchus ovatus are established in Alberta (Proc. Entomol. Soc. Wash. 1999). The weevils of this genus range from 4 to 13 mm in length, have stout snouts of varying widths, elbowed antennae, may be black, brownish, reddish, or any combination of these colors (Warner and Negley 1976). Their bodies may be either dull with scales or shiny with hairs, and some species have red legs (Warner and Negley 1976). Their femora may or may not be toothed, which together with the shape of their tibia are used in species identification (Warner and Negley 1976).
Adults are flightless with fused elytra, feed nocturnally, prefer dark quiet places during the day, and are known to aggregate in large groups (Warner and Negley 1976). Some are parthenogenetic and no males occur in Alberta (Warner and Negley 1976). Although males of all species have been described in Europe, only males of O. ligneous (Olivier), O. meridionalis Gyllenhal and O. porcatus (Herbst) have been found in North America (Warner and Negley 1976). Adults and larvae are polyphagous, spreading quickly via shipments of horticultural products, and many are pests of horticultural and agricultural crops (Entomol. Soc. of Wash. 1999).
Larvae feed on plant roots, while adults feed on a wider range of plant foliage (Warner and Negley 1976). Alberta plant hosts include maple, maidenhair, bittersweet, borage, clematis, dracaena, hawthorn, cyclamen, carrot, strawberry, hops, juniper, alfalfa, mint, four o'clock, bean, spruce, pine, tuberose, rhododendron, rose, raspberry, potato, spirea, yew, arborvitae, red clover, hemlock and blueberry (Warner and Negley 1976).
All North American species are Palearctic (Warner and Negley 1976).
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