Toxicity of Various Extracts of Derris Root to Sucking and Chewing Insects

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Derris root was extracted with acetone, alcohol and water, using two different processes. One process consisted of continuous distillation in Soxhlet apparatus for 10 hours. The other process consisted of making a suspension of the ground root in the solvent and allowing it to stand for 48 hours. The mixture was filtered thru cheesecloth and washed several times with fresh solvent. Secondary extracts were obtained by re-extracting the root residues from one solvent with another solvent. The primary and secondary extracts were tested on apple aphis, silk moth caterpillars and mosquito larvae. The results suggest the following conclusions.

Water soluble organic solvents such as acetone and alcohol are able to extract practically all of the water-soluble and water-insoluble ingredients of derris root toxic to sucking insects. Either continuous distillation or soaking with subsequent filtration and washing will extract practically all the active principles when acetone or alcohol is used. Water does not extract all the toxic principles of derris root. At low dilutions the water extracts compared well in toxicity with acetone and alcohol extracts, but proved inferior to them in high dilutions. Water extracts rapidly deteriorate on standing with resultant loss of toxicity. (Paper withdrawn for publication elsewhere.)

Document Type: Research Article

Publication date: April 1, 1934

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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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