The red spider has about 10-20 generations a year. It mainly lives in litter, wild hosts and earth seams. It first takes spots and spreads to the whole park. The most suitable temperature is 29 °C -31 °C, the optimum humidity is 35% -55%, the temperature reaches 30 °C or more and relative humidity exceeds 70%, is not conducive to its reproduction, heavy rain has a good inhibitory effect. In the hot and dry season, cotton red spiders are harmful to the larvae. The light cotton seedlings stop growing, the budding bells fall off, and the premature aging declines. In severe cases, the leaves become red, dry and fall off, and the cotton turns into a polished rod. The control index of the insect pests was 7%-17% of red leaves at seedling stage, 5%-14% of red leaves at flowering stage, and 3%-7% of red leaves at flowering stage. Prevention and treatment of cotton red spider should pay attention to the use of 15% of wolfberry 1000-1500 times, 1.8% of avermectin 2000 times in time of high temperature and dry season.
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