Differential grasshopper

Definition

A large, polyphagous grasshopper species (Melanoplus differentialis) in the family Acrididae, native to North America and ranging from northern Mexico through the central United States to southern Ontario, Canada. Recognizable by the black chevrons on the hind femora that contrast sharply with the yellowish background coloration—features that give the species its common name. It is a significant agricultural pest, feeding on a broad range of crops including alfalfa, corn, soybeans, and small grains, and can reach outbreak densities that cause substantial economic damage.

Etymology

From Latin differentia (difference, distinction), referring to the distinctive contrasting color pattern on the hind legs that differentiates this species from similar Melanoplus grasshoppers.

Example

During outbreak years in the Great Plains, differential grasshopper populations can defoliate soybean fields so severely that farmers must apply insecticides or face yield losses exceeding 50 percent; the species' tendency to aggregate along field margins and roadsides makes targeted management possible.

Synonyms

• Melanoplus differentialis

Related Terms

• Melanoplus
• Grasshopper
• Acrididae
• polyphagy
• pest outbreak
• chevron marking
• hind femur

Usage Notes

The common name refers specifically to the contrasting (differential) black markings on the hind legs, not to any difference in behavior or damage potential compared to other pest grasshoppers. Often confused with the two-striped grasshopper (M. bivittatus) and the red-legged grasshopper (M. femurrubrum), but distinguished by the V-shaped (chevron) markings rather than stripes or uniform coloration. In ecological studies, the species serves as a model for understanding density-dependent phase polyphenism and migration dynamics in acridid grasshoppers.