Food containing pesticide against insects Luoyang 3 percent to avoid wild insect Granville, no antifeedant: Insects probation is very sensitive to chemicals, but according to the probation of chemical species differ: Usually insects inorganic sentience poor, organic synthesis amidine insecticide Shanghai 3% to insects Granville, Lepidoptera larvae antifeedant. Insects of organic synthesis reactions vary greatly pesticides, organic synthetic drugs for some very weak influence. From insect embryology shows: insect digestive tract before the same body wall hindgut and sources, are the tip of the embryo developed from the ectoderm. Front and rear body wall retraction intestine is formed, so that's agents may also have a contact action and stomach toxicity was before and after the insect intestinal tract.