All hough the relationship between laboratory toxicity data and field performance of pesticides is generally unexplored, the knowledge of such correlation would be valuable for the evaluation of new compounds. After trying various means of correlation, the following mathematical model has been derived by the method of least squares for the calculation of 215 pairs of comparisons of 15 insecticides tested against several leaf-feeding insect pests. log Y = ─0,0041 + 0.4875 log X Where X is the relative toxicity of a compound in the laboratory against a standard and expressed as the ratio of toxicity indexes and Y is the relative performance of the same compound against the same standard and expressed as the ratio of field dosages. A good degree of correlation was obtained between laboratory and field data. when experimental data were substituted into the above equation the calculated dosages for demeton. diazinon, naled, azinphosmethyl, malathion, methyl parathion, mevinphos, Aramite® [2 (p-tert-butylphenoxy) isopropyl-2-cbloroethyl sulfite], dieldrin, DDT, SD 3110 (5,6,7,8,9-hexa- chloro-1,4,4a,5,8,8a- hexahydro-1,4:5,8-dimethanophthalazine), SD 3450 (N-oxide of SD 3110) , isobenzan, and carbaryl agree fairly well with their recommended field dosages for control of two-spotted spider mites, Tetranychus urticae (Koch); pea aphids, Acyrthosiphon pisum (Harris) ; corn earworms, Heliothis zea (Boddie); and/or devastating grasshoppers, Melanoplus devastator Scudder. This equation may be used also for calculating approximate field dosages for candidate insecticides and for selecting laboratory test methods for screening new compounds.
Document Type: Research Article
Publication date: October 1, 1966
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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.