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Methods to Evaluate Sweet Potatoes for Resistance to the Banded Cucumber Beetle in the Field

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Roots of highly susceptible, intermediate, and highly resistant breeding lines of sweet potato were infested in the field with eggs of Diabrotica balteata LeConte. The eggs were applied in a 0.125% agar-water suspension. Since large numbers of eggs were needed, cold storage tests were conducted before the field tests. Eggs kept at 10°C in the agar-water suspension for 16 and 32 days had viabilities of 96 and 60%, respectively. Therefore, eggs used in the field were stored no longer than 16 days. Plants were exposed to the eggs at five infestation levels, at the preroot and root enlargement stages, and in protective barriers and cages to contain the insects. The results showed that damage was highest without the aid of the barriers and cages when plants were infested in field plots at preroot enlargement with 1,000 eggs per plant. This technique will be useful for evaluating sweet potato lines for insect resistance.

Document Type: Research Article

Publication date: February 1, 1982

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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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