1. Symptoms Symptoms of summer vegetables often cause growth retardation of stems and leaves of seedlings, atrophy of seedling growth points, and stagnation of growth; the leaves start to whiten and scorch from the edges, the whole plant gradually wilts, and finally the whole plant is dead. This is mainly due to improper selection of pesticides or unequal concentration of preparation, resulting in too high concentration and excessive spray; some also have poor grasp of the time of spraying, often at high noon temperatures and strong light times. 2. Countermeasures (1) According to different diseases and insect pests to the right medicine; (2) Mixing evenly when formulated, the concentration should be appropriate; (3) Spray droplets require fine and uniform, generally no more than a drop of water droplets for the degree; (4) nursery The use of highly toxic and highly toxic pesticides is forbidden during the process; (5) After the occurrence of phytotoxicity, clean water should be promptly sprayed to ease the phytotoxicity.
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