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Direct and Indirect Effects of a Large-Scale Application of Nosema locustae (Microsporida: Nosematidae) on Rangeland Grasshoppers (Orthoptera: Acrididae)

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Abstract:

In 1988,a study in central Wyoming was done to determine direct and indirect effects of a large-scale (3,250 hal field application of Nosema /ocustae Canning on rangeland grasshoppers. No clear direct or indirect effects of N. locustae on low-density «<9.6 grasshoppers per m2) populations were apparent compared with controls. In the 3 wk after application of N. locustae, high-density (˜9.6 grasshoppers per m2) populations had 40 to 45% higher mortality than controls. However, between 3 and 7 wk after treatment, a natural population crash obscured any further effects. In treated, high-density asemblages, grasshoppers exhibited higher rates of necrophagy and lower fecundity than controls. Treated plots had greater forb, grass, and total plant biomass than untreated plots. Although the highdensity community structure (based on grasshopper subfamilies) was not affected by treatment, the sex ratio shifted significantly; proportionately fewer males were found in treated areas. The rate of development and mean body weight of grasshoppers in high-density treated areas did not differ significantly from that of controls. The relevance of indirect effects of N. /ocustae to grasshopper management and the conditions accentuating these effects are discussed.

Document Type: Research Article

Publication date: April 1, 1990

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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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