How to Manage Pests

Pests in Gardens and Landscapes

Squash bug—Anasa tristis

Adult squash bugs are 0.63 inch long, grayish or yellowish brown, flatbacked, and somewhat speckled, often with a dense covering of black hairs. Edges of the abdomen are orange or orange and brown striped. Nymphs are pale green to almost white.

Life cycle

Damage

Leaves develop small specks that turn yellow and later brown; plants may wilt and die.

Solutions

Remove all debris from the garden once the crop is harvested by composting or thoroughly discing or rototilling it under. Handpick adult bugs and nymphs; search for and destroy eggs in the spring and early summer. Trap bugs under boards near plants at night and destroy them in the morning. Garden insecticides are not very effective, especially on larger bugs. Insecticidal soap or neem oil may control the smallest nymphs.

For more information, see the Squash Bug Pest Note.

Adults are found mating in the field
Adults are found mating in the field

Feeding causes wilting of some plants
Feeding causes wilting of some plants


Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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