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July focus on the prevention and control of three generations of blind stink bugs
In recent weeks, cotton fields in coastal regions and along the Yangtze River have experienced severe damage. The cotton leaves are turning yellow and falling off, which significantly hinders boll development. This has raised concerns among farmers about how to effectively prevent and manage such infestations. Understanding the life cycle and behavior of pests is crucial for implementing timely control measures.
The L. obliquus species is more commonly found in L. lucidum and C. japonica. Its infestation typically occurs 7–10 days earlier than that of C. japonica. In addition to damaging the buds, the green-lipped stink bug feeds on tender shoots and young leaves, causing small black spots. As these lesions expand, holes form, leading to incomplete top leaves—a condition known as "breaking head madness." The most significant damage occurs during the flowering and bolling stages, particularly affecting reproductive organs more severely than younger buds.
The second generation of blind stink bugs reached its peak in mid-June. The reason for this surge is largely due to the Meiyu season, which brought continuous rain and heavy downpours. This prevented farmers from applying pesticides at the optimal time, leading to a large population of insects surviving into the tail peak. Surveys indicate that in some areas, there are approximately 100 insect strains per field, with 10–20 of them causing visible damage. With the second-generation population still high and more rain expected, the third generation is expected to emerge around late July 15th, with moderate infestation levels.
Given the high numbers of the second generation, the focus now should be on controlling the third generation of blind stink bugs. Farmers are advised to use cotton nymphs aged 2–3 years and apply treatments continuously for 2–3 rounds. In Jiangsu, control efforts began around July 10. The first application was between July 10 and 15, targeting green-lipped stink bugs. A second treatment was applied 7–10 days later, focusing on black-clawed stink bugs. A third application would be decided based on residual insect populations. Typically, combined control of the third generation of blind stink bugs, along with corn borers and cotton bollworms, takes place around July 27–28.
Pesticides such as 40% chlorpyrifos emulsifiable concentrate diluted 500 times, 50% malathion EC diluted 1000 times, 40% omethoate EC diluted 1500–2000 times, and 40% phoxim EC diluted 1000 times are commonly used. Chlorpyrifos is known for its fast-acting properties, long-lasting effectiveness, and strong control performance, making it a popular choice in practical applications. It's important for farmers to follow these guidelines closely to minimize crop losses and ensure sustainable pest management.