Recently, a reporter learned from the Pest and Disease Reporting Office of the National Agricultural Technology Center that although the early-stage pests and diseases in cotton fields are generally light—covering a national area of 100 million mu, including 78 million mu of insect infestations and 22 million mu of diseases—the number of cotton red spider mites is high in some regions. From July to August, most areas of the Yellow River Basin, as well as northern Jiangsu and Anhui, have experienced increased rainfall. These conditions create a favorable environment for pests like the cotton red spider mite. It is crucial to monitor these pests closely and use appropriate treatments promptly to prevent large-scale outbreaks that could reduce yields.
It is expected that the overall occurrence of pests and diseases in cotton will be moderate during the middle and late stages, with more severe damage than previously observed. The main pests include the cotton bollworm, cotton red spider mite, aphids, leafhoppers, and whiteflies. The primary diseases are Verticillium wilt and cotton damping-off. It is estimated that 200 million mu of pests and diseases will occur in the middle and late stages of cotton, including 170 million mu of insect pests and 30 million mu of diseases.
The third generation of cotton bollworms is expected to affect 25 million mu. While most cotton-growing areas across the country show light infestation, moderate occurrences are reported in Shaanxi and southern Shandong. The second generation of adult moths has already emerged, and the third generation eggs are currently developing. In the Yangtze River Basin, Shanxi, and Shaanxi, this development occurred earlier than usual, while in most parts of the Yellow River Basin and Xinjiang, it is slightly delayed. The fourth generation of cotton bollworms is expected to affect 1,800 acres, with moderate infestations in the Yangtze River region, lighter in the Yellow River and southern cotton areas. Larvae hatching is expected between late August and mid-September.
Cotton red spider mites are expected to affect 20 million mu in the third generation. Moderate infestations are anticipated in the Yangtze River and Yellow River Basins, as well as southern Xinjiang, with peak activity from mid-July to early August. The fourth generation is expected to cover 15 million mu, with moderate infestations in most of the Yangtze and Yellow River regions, peaking from mid-August to early September.
Cotton aphids are expected to affect 30 million mu. The Yangtze River Basin, Yellow River Basin, and Xinjiang cotton regions are generally moderate, but higher infestations are expected in Jiangsu and northern Xinjiang. The peak period is expected from late July to mid-August.
Cotton leafhoppers are estimated to affect 30 million mu, with moderate infestations in the Yangtze River Basin and most of Xinjiang. Higher infestations are expected in Jiangxi and Jiangsu, while the Yellow River Basin shows lighter infestations. The peak period is expected from late July to mid-August.
Bemisia tabaci (whitefly) is expected to affect 15 million mu, with moderate infestations in the Yangtze River, Yellow River, and most of Xinjiang. Higher infestations are expected in Jiangsu and Xinjiang, with the peak period occurring in August.
Red bollworms are expected to increase in the Yangtze River Basin, affecting approximately 5 million mu.
Bell disease is expected to affect 10 million mu in major cotton-growing areas, with the peak period occurring in mid-August and mid-September. Farmers are advised to remain vigilant and implement timely control measures to mitigate potential losses.
Railway Parts
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