To effectively control pests and diseases and cultivate high quality and safe vegetables, pesticides must be used scientifically and rationally. Before use, it is necessary to understand the control objects and methods of use of each pesticide, and accurately select the drugs to achieve a targeted target. There are four principles for greenhouse vegetable use.
One is to use the medicine at the right time. It should be applied in the early stage of pests and diseases. Considering the warm and humid environment in the shed, it is not advisable to spray on rainy days or high temperatures to prevent the temperature in the shed from being too high and reducing the efficacy. At the same time, do not use sulfur preparations to control melon and vegetable diseases at high temperatures to avoid phytotoxicity.
The second is the rotation of medication. Different types and different mechanisms of action should be used interchangeably. For example, omethoate belongs to organophosphorus pesticides, and enemy killers belong to pyrethroid pesticides. Their mechanism of action is different. If you pay attention to rotation, you can avoid or delay pest and disease resistance. The production.
The third is safe medication. In the production of vegetables, high-efficiency, low-toxic, low-residue pesticides should be used. It is forbidden to increase the concentration of the liquid at will, the number of times of use should not be too much, and the drug should be used strictly according to the safety period. At the same time, the use of highly toxic pesticides such as organochlorine, carbofuran and methamidophos should be strictly prohibited.
Fourth, do not purchase pesticides that are ineffective. When purchasing or using chemical pesticides, it is necessary to identify the quality of the pesticides. If the pesticides that have expired are purchased or used, it will not only directly cause economic losses, but also easily cause phytotoxicity.
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