At present, the main causes of vegetable contamination are improper use of pesticides, unreasonable use of chemical fertilizers, and environmental pollution. Because vegetables are mostly fresh and ready for human consumption, these organizations are also vulnerable to diseases and insect pests. Sometimes, they also need to be controlled during the harvest period to carry out “worm-eaten harvesting of vegetables†to effectively control pests and diseases. To ensure the safety of human food, so the selection of pesticides is particularly important. First of all, we should choose biological pesticides or biochemicals that are effective and have no toxicity or minimal toxicity to humans, Livestock, and natural enemies. For example: bt preparation, has a good control effect on cabbage caterpillar, diamondback moth, etc. This type of preparation is eaten into the gastrointestinal tract by insects, and under alkaline conditions, it acts as a poison to kill insects. People and livestock are acidic, Bt toxicity can not play, and human and animal safety. Biochemical preparations refer to agricultural antibiotics such as streptomycin, penicillin, etc., which can be used by the human body. Of course, the use of vegetables is also safe. The second is the selection of specific insect growth regulators, such as diflubenzuron, Nongmonte, Youlede, and CPT, etc. The mechanism of this type of chemical pesticides is to inhibit the growth and development of insects, so that they cannot be peeled and ageing, and their insecticidal activity. Very high, very low toxicity to humans and animals. The third is to choose high efficiency, low toxicity and low residual pesticides. Normal use of such pesticides will not cause poisoning accidents and it is safer. The fourth is targeted selection of moderately toxic and low residual pesticides with good efficacy. The variety of pests and diseases of vegetables is very serious. In particular, some catastrophic diseases and insect pests, which are improperly controlled or not timely, can cause devastating losses. The preparations of biological agents and specific functions have few varieties, strong professionalism, and limited opportunities for selection, and these pesticides have a slightly faster effect. In the case where pesticides with low toxicity and low residual levels cannot be used to control pests, moderately toxic pesticides can be used. The application of such pesticides must pay attention to: First, pesticides should be applied in accordance with the safe use of pesticides; Second, the use of pesticides with lower toxicity should be selected, and pesticides with LD50 above 100 or 200 can be selected to be safer.
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