High temperatures affect continuous high temperature weather and continuous rainy weather, which poses a great threat to the vegetable seedlings cultivated in autumn. Continuous high temperature weather not only affects the normal growth of seedlings, causing wilting growth, stagnation, etc., and the high temperature conditions tend to affect the flower bud differentiation of seedlings, resulting in a higher proportion of early flowering, fruit drop and abnormal shaped fruit, so that the benefit of the previous period is greatly reduced.
High humidity effects Under high humidity conditions, vegetable plants are in a state of water saturation and prone to leggy. In particular, eggplant vegetables and melon vegetables are particularly evident in this regard. After a prolonged growth of vegetable crops, cell walls become thinner, and the stress resistance of plant organs declines, and they are vulnerable to high temperatures, resulting in high-temperature burning of cell tissue and causing sunburn, which not only affects the growth of the plants, but also results in yield. Must be affected. The moisture in the soil is in a state of saturation for a long period of time, which makes it easy for the root system to be in an oxygen-deficient state, causing the infection of roots and soil-borne diseases, leading to the emergence of "dead trees."
At present, most vegetables are in the stage of nursery, and damping-off disease and blight of eggplants and melons are common. One of the symptoms of damping-off was a water-stained base at the base of the seedlings, which gradually contracted and fell to the ground. Bacterial disease often occurred when the true leaves were seen. The seedlings at the early stage of the disease wilted during the day and the stem base contracted. At present, the disease rate of these two diseases is relatively high, and other sclerotia, gray mold, downy mildew also occur to varying degrees.
Control methods Agricultural control. Renovate field drainage facilities, clean the garden, use the sunny morning, strengthen the ventilation of the greenhouse, and regulate the temperature inside the greenhouse. Chemical control. When the humidity in the rainy weather is high, the method of smoking should be adopted. For every 200 square meters of greenhouse, use 20% smoked or 20% slow-fired smoked tablets 100 grams, smoke in the closed booth in the evening, the next day Open ventilation in the morning. Spraying in clear weather to prevent dampness and downy mildew, choose 58% metalaxyl or 68% gold mine 600 times liquid; control damping-off, sclerotia, gray mold, use 50% procymidone 1500 times or thiophanate-methyl 1000 times.
High humidity effects Under high humidity conditions, vegetable plants are in a state of water saturation and prone to leggy. In particular, eggplant vegetables and melon vegetables are particularly evident in this regard. After a prolonged growth of vegetable crops, cell walls become thinner, and the stress resistance of plant organs declines, and they are vulnerable to high temperatures, resulting in high-temperature burning of cell tissue and causing sunburn, which not only affects the growth of the plants, but also results in yield. Must be affected. The moisture in the soil is in a state of saturation for a long period of time, which makes it easy for the root system to be in an oxygen-deficient state, causing the infection of roots and soil-borne diseases, leading to the emergence of "dead trees."
At present, most vegetables are in the stage of nursery, and damping-off disease and blight of eggplants and melons are common. One of the symptoms of damping-off was a water-stained base at the base of the seedlings, which gradually contracted and fell to the ground. Bacterial disease often occurred when the true leaves were seen. The seedlings at the early stage of the disease wilted during the day and the stem base contracted. At present, the disease rate of these two diseases is relatively high, and other sclerotia, gray mold, downy mildew also occur to varying degrees.
Control methods Agricultural control. Renovate field drainage facilities, clean the garden, use the sunny morning, strengthen the ventilation of the greenhouse, and regulate the temperature inside the greenhouse. Chemical control. When the humidity in the rainy weather is high, the method of smoking should be adopted. For every 200 square meters of greenhouse, use 20% smoked or 20% slow-fired smoked tablets 100 grams, smoke in the closed booth in the evening, the next day Open ventilation in the morning. Spraying in clear weather to prevent dampness and downy mildew, choose 58% metalaxyl or 68% gold mine 600 times liquid; control damping-off, sclerotia, gray mold, use 50% procymidone 1500 times or thiophanate-methyl 1000 times.
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