Over a 3-year period there was great variation in vegetative ground cover, and stands of perennial grass were more uniform and stable than those of annual grass or forbs. Blue grama and alfilaria were dominant, and perennial grasses were the most valuable and dependable forage plants. Important grasshoppers were the migratory grasshopper (Melanoplus bilituratus (Walker)) Aulocara elliotti (Thos.), and M. cuneatus (Gurney). All the species fed on a wide variety of grasses and forbs, but bilituratus and cunealu.s showed a greater preference for forbs than did elliotti. Grasshopper populations ranged from 9 to 27 per square yard. Average damage was 23% to perennial grass, 26% to forbs, and 30% to annual grass. Total damage and unit-area damage per grasshopper were greatest in .July, and unit-area damage per grasshopper was greater to annual grass and forbs than to perennial grass. Damage to perennial grass was greatest where the vegetation was sparse and the grasshopper population high, while the highest unit-area damage per grasshopper occurred where the vegetation was sparse and the grasshopper population moderate to light. The perennial grass ground cover was highest where elliotti was dominant.
Document Type: Research Article
Publication date: August 1, 1960
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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.