In winter, greenhouses are cultivated in greenhouses, and the highly humid environment in the greenhouses can cause serious diseases of cucumber. Some vegetable farmers are eager to prevent diseases and blindly increase the dosage or improper use of pesticides. They often cause damage to cucumbers, interfere with the normal physiological functions and metabolism of cucumbers, and show a series of physiological changes, resulting in the appearance of external morphological specificity. Unusual performance.
Cucumber produces phytotoxicity, which is the most serious damage to the leaves. It often appears as leaf withering, and the color fades into a yellow-white chlorotic color, accompanied by colored spots, coking at the edges, tissue perforation, shrinking and curling, thickening and stiffness, and early shedding. Therefore, we must take effective measures to prevent and control.
1. It is necessary to strictly follow the concentration and dosage of pesticides on the instructions for use, and the use of drugs should be scientific and reasonable. Dispensing should be done with clean water. If it is hard water, it must be softened beforehand. Spray the drug carefully, evenly, and thoughtfully to avoid overdosing.
2. Can not be used when the cucumber is weak in drug resistance. In general, seedling stage and flowering stage are weak in drug resistance, and should be used with caution; in the high temperature and dry noon due to sufficient sunlight, the cucumber leaves transpiration is fast, the drug resistance is weakened, and the drug activity is enhanced, so the spraying time should avoid strong periods at noon. .
3. If you find that the wrong spray pesticides, rinse with water 2-3 times. For cucumbers with phytotoxicity, promptly take remedial measures. When the seedlings suffer from light damage, timely cultivating loose soil, timely topdressing nitrogen fertilizer, promote seedling growth and development. When the damage is heavy, timely irrigation, increase phosphorus, potash, cultivating loose soil, promote root development, and enhance its ability to recover. At the same time, foliar spraying of chloroplasts, plant life sources and other foliar fertilizers was conducted 1-2 times.
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