Insect Management Handbook

Sitona lineatus

Pest description and crop damage Adults are grayish-brown, slender weevils about 0.19 inch long with a short snout. Wing covers are marked lengthwise by parallel striations. Larvae are small, C-shaped, legless, soft and fleshy, and up to 0.19 inch long. They are milky-white with a brown head.

Meligethes nigrescens

Pest description and crop damage Nitidulid beetles are rarely a pest of snap beans and rarely require treatment. Adult beetles are small and black. They infest blossoms from mid-July to mid-August. They may cause blossom drop, but control is unnecessary unless populations are very high.

Management-chemical control: HOME USE

No products are registered for control of this pest.

Lygus spp.

Pest description, crop damage and life history

See:

Common Pests of Vegetable Crops

Pest monitoring Use sweep nets to sample for lygus bugs. In the Pacific Northwest, a suggested treatment threshold is one-half adult or one-half for fourth or fifth instar per sweep..

Many species

Pest description, crop damage and life history Grasshoppers are rarely a problem in snap beans. Grasshoppers eat irregular holes in leaf tissue and can defoliate plants in high numbers, especially when swarming. Damage tends to be greatest on the edges of fields near pasture areas or roadsides. When wild grasses and other plants become dry, grasshoppers migrate to irrigated croplands.

See:

Scutigerella immaculata

Pest description, crop damage and life history

See:

Common Pests of Vegetable Crops

Biology and control of the garden symphylan

Western spotted cucumber beetle (Diabrotica undecimpunctata)
Western striped cucumber beetle (Acalymma trivittatum)

Pest description, crop damage and life history

See:

Common Pests of Vegetable Crops

Includes

Beet armyworm (Spodoptera exigua)
Bertha armyworm (Mamestra configurata)
Western yellowstriped armyworm (Spodoptera praefica)
Black cutworm (Agotis ipsilon)
Variegated cutworm (Peridroma saucia)

Pest description, crop damage and life history

See:

Includes

Bean aphid (Aphis fabae)
Green peach aphid (Myzus persicae)
Pea aphid (Acyrthosiphon pisum)
Potato aphid (Macrosyphum euphorbiae)

Pest description, crop damage and life history

See:

Ctenicera spp. and Limonius spp.

Pest description, crop damage and life history

See:

Common Pests of Vegetable Crops

Management-biological, cultural, tactical

See:

Includes

Pacific spider mite (Tetranychus pacificus)
Strawberry spider mite (Tetranychus turkestani)
Twospotted spider mite (Tetranychus urticae)

Pest description, crop damage and life history

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