Wyoming Agricultural Experiment Station
912 - February 2002
Robert E. Pfadt - University of Wyoming
Nearly 400 species of grasshoppers are known to inhabit the 17
western states. Of these, approximately 70 species are common enough
to be encountered regularly by persons scouting for damaging populations.
For personnel who lack taxonomic experience, identifying the nymphs
and adults of these common grasshoppers is difficult. Yet the need
for considering species in control decisions becomes ever more urgent.
Control officials need to know both the identities and the densities
of species composing infestations to assess accurately the economic
threat and select prudent solutions.
This Field Guide to Common Western Grasshoppers provides the scout
with color pictures of the nymphs, adult male, and female, and illustrations
and descriptions of distinguishing characters allowing comparisons
with unknown specimens that need identification. The guide also
contains distribution maps of species, brief accounts of their seasonal
cycles, feeding and reproductive behavior, and habitat preferences.
All may serve as additional clues to the identities of specimens
as well as provide pertinent information for grasshopper management.
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