From a total of over 95,000 infested squares, about 37,000 boll weevils, Anthonomus grandis, were obtained, which represents an emergence of 39.2 per cent. These weevils were used in the toxicity work of the Chemical Warfare Service along with 60,000 additional field weevils. The best results were obtained by infesting field cotton at the rate of one weevil to five squares, and picking the infested squares a week or ten days after they had been punctured. If the percentage weevils to squares ran higher than one weevil to five squares, the weevils were hand picked down to this ratio. This prevents feeding and egg punctures on the same squares. The infested squares were then placed in an incubator, one layer thick, on shallow 1Published by permission of the Chief of the Chemical Warfare Service, U.S.A. trays containing about an inch of moist sand. They were kept from becoming too brittle by spraying lightly with water as necessary. It normally required about two weeks in the incubator for completion of each batch. Weevils were supplied at the rate of more than 2,000 per week until sufficient field weevils were available for the work.
Document Type: Research Article
Publication date: August 1, 1926
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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.