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T. L. Ladd, M. Jacobson, C. R. Buriff, Japanese Beetles: Extracts from Neem Tree Seeds as Feeding Deterrents, Journal of Economic Entomology, Volume 71, Issue 5, 15 October 1978, Pages 810–813, https://doi.org/10.1093/jee/71.5.810
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Abstract
In both laboratory and field tests over a 3-yr period, solvent extracts from seeds of the neem tree, Azadirachta indica A. Juss., successfully deterred Popillia japonica Newman from feeding on sassafras leaves, Sassafras albidum (Nutt.), and soybeans, Glycine max (L.). In most instances, untreated foliage was completely destroyed, whereas leaves protected with the neem extracts remained untouched or, at worst, were only slightly damaged.
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© 1978 Entomological Society of America
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