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In many sheds, the author found that the plaque on the leaves of the eggplant was large and thin, and concentrated on the front of the leaves in the middle of the plant. The use of such a drug has the following drawbacks: the degree of atomization of the sprayed liquid is poor, the leaves are unevenly treated and lax; the upper and lower branches of the plant have less medicine, especially the lower branches; the third is that the leaves are not sprayed on the reverse side. The drug, while most of the sprayed drugs have poor penetrability, is not conducive to the control of the disease on the opposite side of the leaf.
To this end, the author believes that in order to improve the effectiveness of chemical control, the spray method must be improved.
First, increase the amount of water and the amount of drug used, the spray should be meticulously sprayed not only to spray the upper branches and leaves of the plant, but also to control the diseases of the main functional leaves, and to focus on spraying the lower branches and leaves of the plants, because the aging of the lower leaves makes the disease resistance gradually weaken, easy Infected bacteria are sick, so be sure to spray. At the same time, it is necessary to spray the ground to avoid the spread of soil-borne diseases. The measure is to increase the amount of water used and the amount of medicine used.
Second, the spray should be fine, the coverage of the liquid should be high. Some vegetable farmers do not change the spray of the sprayer all the year round, the water column is sprayed or the fog is very thick, so that the coverage of the liquid is small, which is not conducive to the control of the disease. Therefore, the vegetable grower should be reminded to change the spray in time to increase the atomization degree of the spray. At the same time, when dispensing pharmaceutical liquids, it is also necessary to add "soft water pass" to the water to purify the water, expand the area of ​​the leaves, and improve the use of the medicament.
Third, do not spray the blade side, both sides of the spray. Most of the bacteria come from the soil, and the number of pores on the opposite side of the blade is significantly more than the front. Many pathogens easily invade from the stomata of the opposite side of the leaf, causing disease. Therefore, when spraying, it is necessary to make the spray cloth carefully and carefully, so that the ground, the front and back sides of the blade, the stems and the fruit should be treated, especially the ground and the opposite side of the blade should be evenly spread.
Improve spray method to improve medication quality
Chemical control is one of the main methods to control vegetable pests and diseases. Especially in the deep winter season, when the vegetable in the greenhouse is insulated as the main line of management, the ventilation time is short, the humidity in the shed is high, and the ecological control is limited. The chemical control has become the best choice for vegetable farmers to control vegetable pests and diseases. Spray is the most commonly used method for vegetable farmers to control vegetable pests and diseases. However, recently, the author has seen the serious occurrence of diseases in the eggplant planting area of ​​Qingzhou City, Shandong Province, except that the humidity in the shed is not controlled, and it is also inseparable from the spray method of the vegetable farmers.
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