Biotechnology is one of the fastest-growing technologies in the 1990s, and biological pesticides are bound to become an important component in the creation of pesticides in the 21st century. Because it is completely degraded in the environment, there is no residue, no pollution, and has a very high biological activity, many highly toxic and toxic biological pesticides become pollution-free pesticide varieties, and even the ideal agent for the control of pests and diseases of vegetables, tea trees and fruit trees. However, propaganda, sales, and some articles in recent years have given the impression that in natural medicine, cosmetics, pesticides, and other fields, all natural sources of products are safe. This erroneous view is not suitable for the safe production and application of pesticides. Is not conducive to the development of biological pesticides. Many biological pesticide formulations cannot meet all the requirements of “high efficiency, low toxicity, low residue, and no pollutionâ€. Biological pesticides are not all low toxicity. Many natural sub-organisms or toxins are highly toxic substances, such as snake venom, poisonous mushrooms and tetrodotoxin. Some biological pesticides being studied or applied are also highly toxic or toxic. They do not pay attention to safety in production and application, and they can also cause human and animal poisoning. For example, carbamate pesticides are derived from the synthesis of physostigmine in lentils. However, physostigmine is a highly toxic substance to humans and animals. It can make the pupils shrink and suffer from breathing difficulties. Biopesticides produce toxic substances during the production process. For example, aflatoxin produced during the storage of plant raw materials is a typical example. In tropical and subtropical regions, due to incomplete processing and storage conditions and long storage time, plant materials are susceptible to aflatoxin production by Aspergillus flavus and Aspergillus parasiticus. The toxin is a type of potent carcinogenic mutagen that is potentially harmful to humans and is a highly toxic substance. Foods contaminated with aflatoxin have carcinogenic effects on cattle, sheep, dogs, ducklings, chickens, rabbits, guinea pigs and cats. The raw material for 0.3% azadirachtin EC is Neem seed. The Yunnan, Hainan, Guangdong and southern provinces of Sichuan are areas suitable for Indochina. Indica seeds are susceptible to infection by Aspergillus flavus and Aspergillus parasiticus. The neem plant preparation developed by the Department of Insect Toxicology of South China Agricultural University used a process other than aflatoxin and applied for patent protection. However, most domestic biopesticide researchers and manufacturers do not pay attention to the problem of aflatoxin contamination.
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