squash bug

insect species

Also known as: Anasa tristis

Written by

The Information Architects of Encyclopaedia Britannica

Last updated

July 14, 2026

Quick Summary

The squash bug (Anasa tristis) is a large, black insect belonging to the Coreidae family, commonly known as leaf-footed bugs. These bugs are significant pests, particularly to plants in the gourd family, including squash, pumpkins, and melons.12

Squash bugs are typically about 15 mm (0.6 inches) long and appear dark brown or black due to numerous dark pits on their surface. They overwinter in adult form, seeking shelter in debris. In the spring, they lay egg masses on the leaves of young squash plants, and multiple generations can occur within a single season.2

While some coreid bugs feed on insects, the squash bug primarily feeds on plant juices. Control methods can include insecticides, but cultural practices like destroying crop residues and crop rotation can also help manage infestations.23

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

4 Britannica Sources

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.

coreid bug
…in North America is the squash bug (Anasa tristis), an important pest of squash, melon, and pumpkin. It is about 15 mm (0.6 inch) long; and, although its basic colour is dull tan, it is covered with so many dark pits that it appears to be brown or black. Squash…
Read More
…in North America is the squash bug (Anasa tristis), an important pest of squash, melon, and pumpkin. It is about 15 mm (0.6 inch) long; and, although its basic colour is dull tan, it is covered with so many dark pits that it appears to be brown or black. Squash…
Read More