Toxicological Studies on the Egyptian Cotton Leafworm, Prodenia litura. I. Susceptibility of Different Larval Instars of Prodenia to Insecticides1

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Abstract:

The susceptibility of the third, fourth, and fifth instars of the Egyptian cotton leafworm, Prodentia litura F., to 4 insecticides was determined. Acetone solutions of the insecticides were opically applied to the larvae using glass micropipets. The most suitable weight for testing within each instar was determined so as to achieve consistent results. As the larvae increased in age and weight, their susceptibility to insecticides decreased. However, the susceptibility of the unit body weight remained about constant.

Observations in the field have always shown that timing of insecticide application is one of the important factors that affect the outcome of spray programs. Much research was conducted to find out the reason for this phenomenon.

Document Type: Research Article

Publication date: August 1, 1964

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.
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