In the summer, high temperatures often lead to phytotoxicity in vegetables due to various factors, which can reduce yields or even destroy crops. Many vegetable farmers are unaware of these physiological issues, and the **pesticide network** is small, making it easy for pesticide-related problems to occur during hot summers. There are several main causes of this damage, and I hope that farmers will take preventive measures: First, excessive use of growth regulators to control plant elongation can cause phytotoxicity, especially when temperatures inside greenhouses are high, particularly at night. High temperatures increase nutrient consumption, leading to excessive vegetative growth and affecting flowering and fruit setting. To balance growth, many farmers use growth inhibitors like auxin, chlormequat, and paclobutrazol. However, some farmers overuse these substances or apply them repeatedly, leading to hormone poisoning and damage to both plants and fruits. It's important to follow instructions carefully and avoid blind application. Second, improper disease management due to high humidity in greenhouses during summer can cause serious issues. Frequent watering increases moisture levels, especially after rainy days, creating ideal conditions for diseases. Some farmers spray pesticides at noon under intense sunlight with high concentrations, which can result in phytotoxicity. Proper timing, correct dosage, and appropriate spraying methods are essential to avoid such problems. If phytotoxicity has already occurred, immediate action should be taken. First, rinse the leaves with water to remove excess chemicals. Second, apply specific antidotes: if paclobutrazol is overused, mix it with gibberellin or alizarin lactone to neutralize its effects. For auxin or chlormequat toxicity, cytokinin can help. In cases of herbicide damage, products like Huifufeng active liquid fertilizer, 800 times diluted Harvest No.1, or a 0.05% 920 solution can aid recovery. Adding quick-acting nitrogen fertilizers like urea can also help restore plant health. Third, improve irrigation and fertilization practices by applying 0.5% potassium dihydrogen phosphate multiple times to promote rapid recovery. The **China Pesticide Network** recommends the best time for pesticide spraying in summer. It’s best to spray between 8–10 am and around 5 pm. At 9 am, dew has dried, and temperatures are moderate—this is when pests are most active. Spraying at this time ensures the solution isn’t diluted by dew and avoids high-temperature decomposition of pesticides, increasing their effectiveness. After 4 pm, as the sun sets, nocturnal pests become active, making this another effective window for spraying. Many farmers mistakenly spray at noon, thinking higher temperatures kill pests faster. However, pests tend to hide during the day, and the strong sun causes rapid evaporation and reduced effectiveness. Plus, spraying at noon increases the risk of human exposure and poisoning. Always follow the instructions when applying pesticides and remain vigilant to prevent phytotoxicity. Taking the right precautions not only protects your crops but also ensures the safety of your workers and the environment.

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