Mainly cucumber bactericide phytotoxicity. The main symptoms of cucumber bactericides are obvious spots or large spots on the leaves. The symptoms of different pesticides are different. Some of them cause severe burns to the leaves and then the broken leaves cause spot-like burns. The strong light causes sun burning and drug injury. When the drug is used at high temperature, the moisture in the drug solution quickly evaporates, and the concentration of the drug solution rapidly increases, and it is easy to increase, which is likely to cause phytotoxicity. The drug concentration is too large, or spray too much liquid. The resistance of vegetables to seedlings is poor, and excessive concentrations of the used liquids can also cause phytotoxicity.
Control methods:
1. Scientific drug use: Scientific drug use refers to the economic, safe and effective use of pesticides, so that it is pollution-free, non-drug-resistant, disease-resistant, and cost-effective. To do this, it is necessary to prescribe the right medicine, grasp the characteristics of the control object, and correctly select the pesticide. According to the prescribed concentration, drug dosage. To mix pesticides properly, two or more pesticides can be properly mixed to avoid weaknesses. The mist and water droplets in the greenhouse are conducive to the dissolution and infiltration of chemicals, which can easily cause phytotoxicity. The spray should be detailed and thoughtful, and the droplets should be small to avoid excessive local doses.
2. Remedial measures: When seedlings are harmed lightly, they should be cultivated in time to loosen the soil, apply appropriate amount of nitrogen fertilizer, and timely watering to promote the restoration of growth. When leaves and plants are seriously damaged, timely irrigation, increasing phosphorus and potash fertilizers, cultivating loose soil, and enhancing recovery capacity, or spraying a foliar fertilizer, a small bag of vigor, agricultural water, 15 kg, or Jintai Long, generation water, 15 kg, or The effect of a small bag with 30 pounds of water spray, spray 7 days, even spray 2-3 times.
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