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At present, the weather conditions are unusual, with droughts affecting both the southern and northern regions of China. Cotton is currently in the boll opening stage, making it a critical time for pest and disease management. It is essential to use **pesticides** promptly to control cotton pests and diseases, thereby minimizing damage and improving both the yield and quality of the cotton crop.
Cotton is originally from the subtropics. The plant is shrub-like and can grow up to 6 meters tall in tropical regions, though it usually reaches 1 to 2 meters in more temperate areas. Its flowers start as milky white and quickly turn deep red before wilting, leaving behind a small green capsule known as a cotton boll. Inside the boll, there are cottonseeds, and fine hairs grow from the outer layer of the seed, filling the boll. When the boll matures, it splits open, revealing soft fibers. These fibers range from white to off-white, measuring about 2 to 4 cm in length, and are composed of approximately 87 to 90% cellulose. The top cotton-producing countries are China, the United States, and India.
First, the occurrence of pests and diseases:
During the boll opening phase, several pests and diseases can affect cotton. The main ones include the fourth generation of cotton bollworms, followed by cotton blind mites, cotton small armyworms, and cotton leaf mites. Recent rainfall has been relatively high, which may have reduced the population of the third generation of cotton bollworms. However, the average temperature in mid to late August has been close to normal, with higher-than-usual precipitation, creating favorable conditions for the fourth generation of cotton bollworms.
Second, prevention and treatment methods:
1. Agricultural practices: Effective field management, such as pruning, removing unproductive flower buds, and manually removing eggs, can help reduce the need for chemical treatments.
2. Pesticide application: According to **China's pesticide network**, it is recommended to use a 5% hexaflumuron emulsifiable concentrate diluted at 1000 times, or a 1% carbaryl salt solution also diluted at 1000 times, or sprays of pyrethroids and organophosphorus pesticides at 1000 to 1500 times dilution. To prevent early aging of the plants, foliar fertilizers like potassium dihydrogen phosphate can be mixed and applied.
Proper monitoring and timely intervention are crucial during this period to ensure healthy cotton development and maximize the final harvest.
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