When releasing the insects at a new location, it is best to release the adults over young plant material similar in size to the plants where the weevil was originally collected. Pupation occurs in the soil surrounding the plant and generally last two to three weeks.įor redistribution, adults can be collected in the early spring with forceps, fingers, an aspirator, or a modified vacuum. Older larvae mine the stem and root crown. ![]() The larvae mine the tissues of the leaf toward the main vein. ![]() Each female lays an average of 120 eggs targeting smaller shoots for oviposition. Females deposit eggs from March until mid-May, while the plants are still less than 5 cm tall. They overwinter as adults and can typically be found in the field from August until June. The adults also feed on the plant foliage in the early spring, although their effect on the plant is limited.Īdult weevils are 3-4 mm long with whitish hairs and a pronounced white T-shaped marking on their back. ![]() Ceutorhynchus litura, or the Canada thistle stem weevil, is a biological control agent that attacks Canada thistle by larval feeding within the stem, opening the plant up for secondary damage from other organisms such as opportunistic pathogens.
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