Squash Bug, Anasa tristis
Horned Squash bug, Anasa armigera
Narrow Squash bug, Anasa andresii
(Hemiptera: Coreidae)

The life cycle requires six to eight weeks and the number of generations varies from one to three per year. The eggs are deposited on the lower surface of the leaves and are usually bronze. The nymphs are light green in color and may become darker gray as they age. The adult is dark grayish-brown and the edge of the abdomen is marked with alternating gold and brown spots.

The squash bug attacks cucurbits (squash and its relatives) throughout the United States. The squash bug is reported to attack nearly all cucurbits, but squash and pumpkin are preferred. Foliage and fruit may be fed upon. Damage is caused due to highly toxic saliva that is secreted into the plant as the insect feeds. The foliage may wilt, become blackened, and die after feeding. The amount of damage occurring on the plant is directly related to the population of squash bugs. Adult squash bugs are difficult to kill with insecticides but nymphs are more susceptible and should be targeted. Pollinators should be taken into account before insecticides are applied. Trap crops (early planted cucurbits) may be used early in the season to reduce populations. Crop debris should be removed as soon as possible. Clean cultivation is essential to reduce the overwintering population.

Images

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Squash bug injury to squash.
(Photographer: J. Capinera, University of Florida)

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Squash bug, Anasa tristis, eggs.
(Photographer: L. Buss, University of Florida)

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Squash bug, Anasa tristis, adult.
(Photographer: L. Buss, University of Florida)

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Squash bug, Anasa tristis, young nymphs.
(Photographer: L. Buss, University of Florida)

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Squash bug, Anasa tristis, adult and large nymph.
(Photographer: J. Capinera, University of Florida)

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Horned squash bug, Anasa armigera.
(Photographer: J. Castner, University of Florida)

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Narrow squash bug, Anasa andresii, adult.
(Photographer: L. Buss, University of Florida)

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Narrow squash bug, Anasa andresii, nymph.
(Photographer: L. Buss, University of Florida)

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