In some cases, the time of pests and diseases in the field may be an appropriate amount of pesticides. However, we must not add too much pesticides once in order to save trouble. This is not correct. You can adjust the amount of pesticides in an appropriate amount to avoid causing The phytotoxicity, so the reasonable dilution of pesticides can not be adjusted.
Practice has proved that increasing the concentration of the drug can improve the effect of disease prevention, but the side effects can not be ignored. For example, the resistance of the pathogen can be produced more quickly, which increases the difficulty of controlling the disease in the future; it is also prone to phytotoxicity and affects the normal growth of the crop. Therefore, it is not advisable for the vegetable growers to carry out pest control only by increasing the amount of the medicament used. To prevent pests and diseases, it is necessary to use multiple methods and comprehensive prevention.
The first is to enhance the plant's own resistance. With more and more fruit plants, the organic and inorganic nutrients in the plants are deficient, and the disease resistance is reduced. When the weather is cloudy, the temperature in the shed is lowered, the temperature of the ground is reduced, the growth of the roots is blocked, the growth of the plants is weakened, and the disease resistance is reduced. Disease infestation. Therefore, it is necessary to pay attention to cultivating strong trees, and not to leave too much fruit, resulting in insufficient nutrient supply and premature aging of the plants.
The second is to create a good shed environment. Any disease has its proper pathogenic environment. Only when the environment is suitable, the disease may be outbreak. For example, gray mold disease is severe in the low temperature and high humidity season, so it often shows an outbreak after cloudy weather in winter. Therefore, to prevent and control diseases, we must first control the shed environment. Vegetable farmers can take various measures to avoid air humidity in the shed for more than 80% for a long time, reducing the chance of disease infection. At the same time, timely remove the old leaves and diseased leaves in the shed, reduce the pathogens, and prevent the infection of the disease.
Again, it is an alternate medication. The more times a pesticide is used, especially when it is used continuously, the greater the chance that the bacteria will develop resistance. Many pesticide types, although they work well at the beginning, have not been used for several times, and the effect is greatly reduced, such as metalaxyl. Therefore, vegetable farmers should use drugs alternately to prevent the bacteria from developing resistance quickly. For example, when controlling cucumber downy mildew , it can be used alternately with chlorfenapyr hydrochloride, metalaxyl manganese zinc, and enoylmorpholine.
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