Spraying, smoke irritating, and irrigating roots are the most common ways to prevent and treat diseases. Spraying can effectively prevent and cure most diseases on the leaves, fruits, stems and other parts of vegetables. Smoke smoke can evenly spread the medicament into the greenhouse and prevent diseases more completely. Irrigating the root can make the medicine and crop roots and soil directly. Contact and kill pathogens.
Spraying, smoking, and irrigating roots can be said to have their own advantages. Therefore, the rational application of these methods, or the rational combination of these methods, can play a multiplier effect, is the important content of pesticides to prevent and control vegetable pests.
For example, tomato bacterial pith necrosis develops within the stem of tomato and damages the marrow of the tomato. If spraying alone, it is difficult to control the development of the disease. There are two reasons for this: First, the effects of copper preparations and other prevention and treatment of bacterial diseases can be described as special effects, but the system has poor systemic absorption. The susceptible part is in the pith, and the spraying and control effect is naturally poor; the second is antibiotics such as streptomycin. The sex is better, but the treatment effect is poor, so the spraying control effect is not good.
If spraying and irrigation are combined and sprayed under irrigation, the liquid is more likely to conduct or infiltrate into the affected part, and the therapeutic and preventive effects will be significantly improved. Irrigation can be used DT (copper fertilizer copper acid), quinoline copper, etc.; spraying Garinong can be used. Severe incidence, but also can be used to inject stems into the needle to prevent and treat diseases.
For another example, loofah burnt-out is the most serious illness for vegetable farmers. It is not only because of the cause of the rottenness of the loofah, but also because of the softness of the sponge gourd and the proneness to phytotoxicity. Therefore, in the use of drug control must pay attention to the use of drugs with the way, can not be solved by spraying alone. Practice has proved that the combination of spraying and fumigation has a significant effect on prevention and treatment of burned-out loofah.
In order to prevent the spread of pathogenic spores and fully kill pathogens, the smoking hood can be closed the night before the drug is used. Smoke agent can use Propylayan smoke agent, chlorothalonil smoke agent, etc., but also smoked sclerotia net, but the amount should not be too large, so as not to cause phytotoxicity, smoking time is best controlled within 8 hours. The next day afternoon spray. For different diseases, symptomatic medication spraying control. Such as cotton rot can be used Pricik, metalaxyl, etc., sclerotinia can be used for pounding sea, and Swiss and so on.
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