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Nicotine sulfate has been used since the turn of the century and is the most hazardous botanical insecticide available to home gardeners. The insecticide is extracted from tobacco by steam distillation or solvent extraction.
Nicotine sulfate(tobacco/water tea combined with sulfur) is excellent for use on all plants except members of the nightshade family(potatoes, eggplants, peppers, tomatoes).
To free his roses from aphids, he sprays with nicotine sulfate, using soap as a sticker-spreader. Japanese beetles are picked by hand, the same way he controls stem borers in his squash plants.
Some organic compounds can be hazardous -- consider nicotine sulfate which can be harmful to you as well as the insects, and rotenone, a good organic spray, but keep it away from fish ponds, because it can kill fish, ...
 See also: Pesticide, Plant, Toxic, Insect, Toxicity
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