Insect Management Handbook

Several species

Pest description and crop damage Dull gray, brown, or black caterpillars that may be striped or spotted. Cutworm are active at night and can be found in the soil by day. They cut off young plants at ground level or feed on foliage at night.

Management-chemical control

No treatment currently recommended.

See also:

Includes

Green peach aphid (Myzus persicae)
Willow-carrot aphid (Cavariella aegopodii)

Includes

Alfalfa looper (Autographa californica)
Cabbage looper (Trichoplusia ni)

Pest description and crop damage Larvae of both species are pale green with white lines on back and sides. They move in a looping manner and feed on foliage and other tender, above ground plant parts. Moth is gray-brown with a characteristic silvery spot on each forewing.

Pieris rapae

Pest description and crop damage Larvae are green and very hairy with a velvet-like appearance. Caterpillars are soft, velvety green with faint yellow stripes. Adult is a white butterfly with black spots.

Management-chemical control

Includes cabbage flea beetle (Phyllotreta cruciferae)

Pest description and crop damage A small, shiny steel-blue jumping beetle that eats round holes in leaves of wild and cultivated crucifers. It is particularly serious on seedlings.

Management-chemical control

Plutella xylostella

Pest description and crop damage Small, pale yellowish green larvae with erect black hairs that eat holes in foliage. Adults are small gray or brown moths with white marks on forewings which form a diamond when wings are folded.

Management-chemical control

Ceutorhynchus assimilis

Pest description and crop damage Small, dark-gray snout beetles that congregate on blooms. Larvae feed on seeds inside pods.

Management-chemical control

Delia brassicae

Pest description and crop damage White maggots that feed on roots and underground stems and weaken, lodge, and kill plants. Adult is a small gray fly that lays white, oblong eggs at plant bases.

Management-chemical control

Includes

Cabbage aphid (Brevicoryne brassicae)
Green peach aphid (Myzus persicae)
Turnip aphid (Lipaphis pseudobrassicae)

Pest description and crop damage Species are gray or lime green in color, mealy plant lice that form colonies on foliage, on heads, or in buds.

Management-chemical control

Includes