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Reduced Fecundity of the Two-Spotted Spider Mite on Metal- Chelate-Treated Leaves1

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The EDTA (ethylenediamine tetraacetie acid), DTPA (diethylenetriamine pentaacetie acid), and EDDHA (ethylenediamine dihydroxy-phenyl-acetic acid) chelates of iron, and the EDTA chelates of manganese zinc, and magnesium to bean leaves in the laboratory reduced the fecundity of the two-spotted spider mite, Tetranyechus telarius (L.), by as much as 90%. The EDTA chelates of magnesium and iron were the most active. The chelates were applied in three ways: by direct spraying of detached leaves, by supplementation of nutrient media in which beans were grown, and by addition to the media in which leaf discs were floated. The two last-mentioned methods were the most effective. Longer intervals between treatment of the plants or leaves and exposure of female mites produced reductions in fecundity, suggesting that some plant physiological process is involved in the chelate effect. Reduced fecundity was demonstrated also on leaves of strawberry, sweet potato, and hop sprayed with the chelates.

Document Type: Research Article

Publication date: February 1, 1964

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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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