The watermelon grows vigorously and the water content of the plant is high. It is sensitive to various chemical agents. Once the application concentration is too high or the drug is used improperly, it is prone to phytotoxicity. The remedial measures after the injury of watermelon are: 1. Rinse with water. Most chemical agents are not resistant to water erosion. If the pesticide concentration is too high due to excessive application concentration, sprayers can be used to immediately fill the stems and leaves with repeated sprays of water to flush away any pesticides remaining on the surface of the plants. The pressure of the sprayer should be sufficient and the amount of water sprayed should be large. 2. Use poison to attack poison. Potassium permanganate is a strong oxidant and has oxidation and decomposition effects on various chemical substances. According to the experiment, when the phytotoxicity occurred in watermelon or when it was found that the drug was used, spraying potassium permanganate 5000-7000 times immediately would relieve the phytotoxicity. 3. Suspension of medication. Before the phytotoxicity has not been completely eliminated, the use of chemical pesticides should be minimized. In particular, the use of similar pesticides should be stopped so as not to aggravate phytotoxicity. 4. Strengthen management. Watermelon phytotoxicity, combined with watering appropriate to add some quick-acting fertilizer, and timely cultivating loose soil, can promote the plant as soon as possible to restore normal growth and development. In addition, it can also be combined with root fertilization and watering, foliar spray phosphorus, potassium, in order to improve plant nutrition, enhance root absorption capacity. Method is: high quality superphosphate 1 kg, add water 40-50 kg, soaked overnight, take the supernatant sprayed watermelon stems and leaves, or with 0.2% -0.3% potassium dihydrogen phosphate solution spray 50 kg per acre.
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