Since the beginning of spring, when the weather is fine, the temperature and humidity in the fields are high, which is extremely conducive to the occurrence of vegetable pests and diseases. According to the investigation in the Changsha area, the soft rot of leafy vegetables is relatively common, with the highest damage reaching 32.7%. Aphids generally occur. Plutella xylostella occurs in some regions, and the maximum number of 100 larvae reaches 20. Blight and damping-off diseases are more serious in some areas and the damage is up to 15%. If the above-mentioned pests and diseases cannot be prevented and controlled in time, it will result in loss of production. The prevention and control opinions are as follows: Select high-quality, high-yield and disease-resistant varieties, such as Xiangcuo No. 2 and No. 3, Xiayuan No. 1 and No. 2 cucumbers, No. 2 loofah, Qingza, Noodle No. 1, No. 2, and No. 3 Melon, pepper and Other pepper varieties on the 6th. Disinfect seeds before sowing, adopt rapid seedling or no soil seedling method, strengthen seedbed management, see proper amount of seedlings to release air, avoid low temperature and high humidity or high temperature and high humidity conditions, and do not water in rainy days. After a slight rooting occurs, it is necessary to loosen the soil in time and increase the temperature of the ground. After the new root grows, it will be transferred to normal management. When a few seedlings appear on the seedbed, the strain should be removed immediately. If the bed is wet, apply a small amount of lime. If the bed soil is dry, resurfacing No. 1, Genzhi Zhi, or 75% chlorothalonil can be sprayed. For the prevention of soft rot of leafy vegetables, the agent can use 72% of streptomycin-soluble powder 3000-4000 times, and 77% can kill WP 500 times. Control maggots, diamondback moths can be used to kill, DuPont hit, fast spirit, 2.5% attack tactics, 5% inhibition Taibao, insects enemies, pest speed, YY, etc., is strictly prohibited using methamidophos, carbofuran, methyl 1605 and other highly toxic high residue pesticides.
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