There are a large number of plant secondary metabolites with insecticidal or bactericidal activity in nature, such as terpenes, alkaloids, flavonoids, steroids, unique amino acids and polysaccharides. These substances have low toxicity to non-target organisms, are easily degraded, will not cause permanent effects on the environment and ecosystem, and are highly safe.
These plant extracts includes Matrine, rotenone, azadirachtin, veratrine, pyrethrum, nicotine, celangulin, eucalyptol, camphor, dextrocamphor, star anise oil, chamaetoxin, triptolide, curcumol, Osthole, eugenol, emodin methyl ether, carvacrol, berberine, sterenol, tea saponin, spirocarb, sophora alkaloids, allicin, d-limonene, terpene alcohol, isosulfide Allyl cyanate, Ginkgo biloba extract (pentadecenphenolic acid, tridecylphenolic acid)
Sophora root mainly contains alkaloids, flavonoids, quinones, and triterpenoid saponins. Alkaloids contain Matrine, oxymatrine, sophoridine, sophoranol, sophoramine, etc.
Tea Saponin has good bioactivity, The tea saponin has stomach toxicity and strong repellent function. The higher concentrated the more repellent. It has control of Cabbage green. The pesticide to control the soil insect, such as cutworm, nematodes etc. also it has killing effect on ampullaria gigas, snall, Oncomelania snail etc. on rice crop.
Veratrine is used as broad spectrum pesticide Insecticide, The veratrine has a good effect to kill aphid, Cabbage worm,plutella xylostella,Phyllotreta striolata Fabricius,Phaedon,Henosepilachna Vigintioctomaculata.