Grasshopper damage is an important problem in large sections of the United States. The results of extensive damage in past years affected agricultural and horticultural pursuits as well as other occupations. One of the important biological checks to grasshoppers in this country is the grasshopper mite, Eutrombidium trigonum, for in its larval stage it is parasitic on grasshoppers and in its nymph and adult stages it preys on grasshopper eggs.
South Dakota State University
Severin, H.C., "The Grasshopper Mite : Eutronbidium trigonum (Hermann) : An Important Enemy of Grasshoppers" (1944). Agricultural Experiment Station Technical Bulletins (1939-2011). 15.