Effects of Seasonal Rainfall on Range Condition and Grasshopper Population, San Carlos Apache Indian Reservation, Arizona1

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From 1953 through 1960 a study was made on the San Carlos Apache Indian Reservation to determine the effects of fall and winter precipitation and the response of range plants to weather conditions on populations of spring-hatching grasshoppers. Four sub areas of Ash Creek Flat with sparse-to-moderate short-grass associations were used. A rain gauge was located in each sub area. Vegetation surveys were made in spring and summer and grasshopper counts were made biweekly. Results indicate that rain- fall from October 1 to March 31 had a direct effect on vegetation and an indirect effect on grasshopper populations. In two '2-year periods (1953-54 and 1957-58) with good rainfall, the spring vegetation was abundant and grasshoppers increased. In the following dry springs of 1955 and 1959 annual weedy Vegetation was sparse and stunted. Grasshopper populations were high but decreased drastically by summer. populations were low in the spring seasons of 1056 and 1060 regardless of range conditions.

Document Type: Research Article

Publication date: April 1, 1961

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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