Squash bug

Definition

A common name for several large, phytophagous true bugs (Hemiptera: Coreidae) that feed on cucurbit vines and fruits, causing wilting and fruit damage through vascular injury. The name is most frequently applied to Anasa tristis in North America, though it also refers to related coreids such as Euthochtha galeator and Physomerus grossipes in different regions.

Etymology

From the association with Cucurbita (squash, pumpkin, and related crops), the primary host plants.

Example

Anasa tristis, the most economically damaging squash bug in North America, aggregates on cucurbit stems and uses piercing-sucking mouthparts to extract sap, often transmitting the bacterium Serratia marcescens that causes cucurbit yellow vine disease.

Related Terms

• Coreidae
• Phytophagy
• Piercing-sucking mouthparts
• cucurbit
• pest management
• true bug

Usage Notes

Not a monophyletic group; the name applies convergently to multiple Coreidae species based on shared host association rather than phylogeny. Distinguish from squash vine borer (Lepidoptera: Sesiidae), a moth with similar common name and hosts but entirely different biology. In field contexts, 'squash bug' without qualification usually implies Anasa tristis in North America.