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Full-grown corm earworms, Heliothis zea (Boddie), require more than 1,000 times as much DDT on a weight basis as small larvae in order to obtain LD-50 values for topical applications in acetone, Injected DDT in acetone is only slightly less effective on large larvae than on small ones, Chemical and radiometrie analysis showed that lack of penetration by DDT through the integument of the large larvae was the chief factor causing the increase in LD-50 values. Addition of nonvolatile oils to the topically applied material increases the effectiveness of DDT to the larger larvae. Tests with different colored larvae indicate that. light yellow larvae are approximately twice as susceptible as the dark red or black larvae.
Document Type: Research Article
Publication date: December 1, 1961
More about this publication?
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.