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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