Effect of Grazing by Cattle on the Abundance of Grasshoppers on Fescue Grassland

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Abstract
Grasshoppers were collected annually from 1970-1976 in late Aug. from experimental fields of fescue rangeland that had been grazed by cattle at 4 rates of intensity. Sixteen species of grasshoppers [Melanoplus dawsoni, Chorthippus longicornis, M. sanguinipes, M. gladstoni, M. biuittatus, M. infantalis, M. bruneri, M. foedus, M. oregonensis, Opeia obscura, Psoleossa delicatula, Xanthippus sp., Camnula pellucida, Encoptolophus sordidus, Aeropedellus clavatus and Neopodismopsis abdominalis] were found but only 4 spp. constituted 90% of the population. C. longicornis, M. sanguinipes, A. clavatus, N. abdominalis and M. bivitatus were more abundant on the lightly and moderately grazed fields; M. dawsoni, M. gladstoni and M. infantalis were more abundant in the heavily and very heavily grazed fields. C. pellucida was randomly distributed among the 4 fields. More grasshoppers were collected from the heavily and very heavily grazed fields than from the lightly and moderately grazed fields.

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