Evaluation of Starch Encapsulation for Formulation of Grasshopper (Orthoptera: Acrididae) Entomopoxviruses

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An entomopoxvirus isolated from Melanoplus sanguinipes (F.) and currently under consideration as a microbial control agent for rangeland grasshoppers was formulated in starch matrices containing various adjuvants and fed to M. sanguinipes nymphs. Percent mortality 21 d after exposure to granules containing molasses (a feeding stimulant) and carbon (an ultraviolet [UV] light screen) was 80%, whereas a formulation containing Congo red produced only 35% mortality. Although control mortality averaged 31 %, percent infection of surviving control grasshoppers was only 1.5%. Percent infection of surviving grasshoppers fed starch-encapsulated virus containing molasses and carbon was 89.7%, whereas only 30% of the survivors were infected following exposure to granules with Congo red. A field test in which starch granules laced with carbaryl were applied to small rangeland plots demonstrated that grasshoppers located and fed upon the granules as readily as the commercial standard wheat bran bait. Survival of virus and acceptance of the starch bait by grasshoppers suggest that this versatile formulation technique should playa major part in the development of grasshopper microbial control products.

Document Type: Research Article

Publication date: December 1, 1991

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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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