问题解答

• ☞ First, the characteristics of vegetable pests and diseases In recent years, China's vegetable area expanded rapidly increasing number of varieties, cultivation methods and diverse, multiple crop index, especially the protection and planting of large numbers of out-of-season vegetables, make the majority of the annual production of vegetables to a large extent, to break the original vegetable crops ecosystem balance, resulting in increased range of vegetable pests. At present, China has reported more than 200 vegetable diseases and insect pests, of which occurred in the year there are more than 70 kinds of diseases, pests are more than 50 kinds of almost any kind of vegetables can be subjected to the infectious diseases and insect pests. In addition, the types of fresh vegetables increased, the protection area expanded cultivation diverse, anti-seasonal cultivation and frequent international exchanges, such as sake, causing some minor pests and diseases that gradually increased as the major pests and diseases; there are a result of long-term, excessive, the single use of pesticides, led to growing resistance to diseases and insects, to control the larger difficulties. Second, control pests and diseases the main problems As the vegetable pests and diseases prevention and control is still mainly of chemicals, so chemical pesticides serious pollution problem. Many farmers can not correctly identify the pests and diseases, lack of basic knowledge of plant conservation and integrated pest management skills, to rely on, misuse and unreasonable use of chemical pesticides more common. Do not know how to implement the "prevention-oriented, comprehensive prevention and control" approach, often playing the "insurance medicine" and play the "belated effort medicine", playing the "cheap drugs", playing the "highly toxic highly toxic drugs" and drug mix-ups and so on. The impact of pollution-free vegetables quality and safety of pesticide products mainly pesticides pesticides (70%), with organic phosphorus-based pesticides, particularly highly toxic, high residue of organic phosphorus insecticide especially. Some farmers use the effects of blindly pursuing isocarbophos, methylamine phosphine, dicofol, carbofuran, and even disable the 1059,1605 and other highly toxic, highly toxic, high pesticide residues, resulting in excessive pesticide residues in vegetables, when human and animal poisoning have occurred, the destruction of the ecological environment, emergence of drug-resistant pests, production costs, such as a series of problems.
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