Potential of Starch Encapsulated Semiochemical-Insecticide Formulations for Adult Corn Rootworm (Coleoptera: Chrysomelidae) Control
Authors: WEISSLING, THOMAS J.; MEINKE, LANCE J.
Source: Journal of Economic Entomology, Volume 84, Number 2, April 1991 , pp. 601-609(9)
Publisher: Entomological Society of America
Abstract:Field and laboratory experiments were conducted from 1987 through 1989 to determine if plant-derived semiochemicals and carbamate insecticides, encapsulated in starch-borate (SBM) and pregelatinized-starch (PGM) matrices, could be used to attract and kill corn rootworm (Diabrottca spp.) beetles. D. vtrgifera vtrgifera LeConte adults were concentrated in plots within a corn (Zea mays L.) field, following application of SBM granules formulated with semiochemicals and carbaryl. However, resulting mortality was low even though beetles were observed feeding on the granules. Low mortality levels appear to have been caused by a loss of carbaryl during the formulation process. Laboratory assay results indicated that carbaryl, methomyl or carbofuran formulated in the PGM effectively killed D. vtrgifera adults but only SBM granules formulated with carbofuran provided acceptable mortality. PGM semiochemical-insecticide granules placed in traps killed Diabrotica spp. over time in field corn. D.v. virgifera and D. undecimpunctata howardt Barber mortality in plots treated with starch-encapsulated semiochemical-insecticide granules were comparable to mortality observed in plots treated with a broadcast application of carbaryl (Sevin XLR Plus) while using 90% less insecticide. Mortality of D. harbert Smith &Lawrence was significantly greater in Sevin XLR Plus-treated plots than in plots treated with starch granules. Mortality of the coccinellid Coleomegilla maculata lengi Timberlake was significantly greater in plots treated with Sevin XLR Plus than in plots treated with starch granules, whereas a reverse trend was observed for the carabid Harpalus pennsylvantcus De Geer. Data suggest that efficacy of starch matrix delivery systems may be affected by the interaction of various biotic and abiotic factors but starch matrices appear to have potential as tools that could be used in the development of new, more environmentally sound, corn rootworm management programs.
Document Type: Research Article
Publication date: April 1, 1991
- 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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