Our country has a wealth of plant resources, there are now identified more than 30,000 kinds of higher plants, many of which contain the body can be used insecticidal, bactericidal or nematicidal composition. These ingredients are the product of the plant’s search for self-protection in its natural environment and a powerful weapon against pests. Plant-based pesticides are new types of pesticides that have been developed using these plant resources. Because the raw materials from plants, also known as “herbal pesticides.”

The main components of plant-derived pesticides come from nature, environmental protection, biodegradable, generally do not pollute the environment and agricultural products, have the advantages of low toxicity and low residue, and pests are difficult to produce antibodies to them. Its main categories are insecticides, fungicides, nematicides, herbicides, molluscicides and rodenticides. Its mode of action and mechanism are:

Toxic killing Toxic kill includes touch and stomach poisoning. The mechanism of contact and killing is generally the agent through the epidermis or smoking after entering the digestive system, resulting in local irritation, causing reflex parasites excited, first inhibit parasympathetic sensory nerve endings, and then inhibit the central nervous pest death. Stomach poisoning is often insecticide insecticides affect the digestive system and showed symptoms of poisoning, such as retention of food residue in the midgut, caking, diarrhea, etc., and finally due to perforation of the midgut rupture, food leakage, decay and death.

Antifeeding and repellent agents can cause insects to tasteless function and showed antifeedant response. Or the agent itself is nontoxic to kill the insects, but the special smell has the effect of avoiding the pests and thus protecting the crops from being infringed.

Narcotic effects Anesthetic ingredients in botanical pesticides can cause insect muscles to relax, limp, and nerves and muscle-controlled movements. In addition, the anesthetic component can also inhibit the insect body detoxification enzyme system, resulting in exogenous poison can not be promptly released in the body, so that insects poisoning.

Inhibition of Growth and Development Some plant-based pesticides interfere with the endocrine activity of insects to affect their normal growth and development. Such as azadirachtin can make growth and development of hormone-related synthesis, secretion, transport to the target blocked or inhibited, resulting in insect metamorphosis, retardation.

At present, the main plant-source pesticides are matrine, oxymatrine, nicotine, rotenone, sanguinarine, cineole, allicin, cepharanthin, osthol, eugenol, carvacrol , Veratridine, toosendanin, azadirachtin and so on