Insect Management Handbook

Includes:

Bertha armyworm (Mamestra configurata)

Variegated cutworm (Peridroma saucia)

Sitona hispidulus

Pest description and crop damage Adults are small grayish weevils 0.2 inch long. Larvae feed on fibrous roots and chew cavities in main roots. This insect usually is at low levels on many of the cloversclovers, but control usually is not necessary. Root damage by clover root curculio also predisposes the plant to secondary pathogens, particularly root rot fungi which further affect stand persistence.

Management-chemical control

Hylastinus obscurus

Pest description and crop damage Adults are bark beetles, 0.1 inch long and dark brown. They begin activity as early as March and may disperse from March through August. Larvae are creamy white and burrow within the roots of red clover, causing extensive damage and reducing stand density and longevity. Root damage by clover root borers also predisposes the plant to secondary pathogens, particularly root rot fungi, which further affect stand persistence.

Donus zoilus

Pest description and crop damage This is the largest weevil found in legume fields. The full-grown larva is about 0.5 inch long and has a brown head. The body is green or yellowish-green, shading to pink at the tip of the abdomen, with a white or pinkish line down the center of the back. Larvae feed on buds and leaves.

Management-biological control

Includes

Clover aphid (Nearctaphis bakeri)
Pea aphid (Acyrthosiphon pisum)

Bruchus brachialis

Gray garden slug (Deroceras reticultatum) and others

Sitona lineata

Pest description and crop damage Adults are small, grayish brown, faintly striped, and about 0.17 inch in length. They appear in large numbers in spring, and sometimes again in late summer. If adult feeding on seedling plants in spring causes considerable leaf notching, chemical control may be necessary.

Management-chemical control

Cnephasia longana

Pest description and crop damage Yellowish brown larvae with a brown head and light stripes on each side of the back. They web terminal leaves and feed on terminal growth.

Management-chemical control

Several species