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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 the development of bolls. This situation has raised concerns among farmers about how to effectively manage the infestation. What steps should be taken to prevent and control this issue?
The L. obliquus species is more commonly found in L. lucidum and C. japonica. The infestation of L. obliquus typically occurs 7–10 days earlier than that of C. japonica. In addition to damaging the buds, the green-lipped stink bug also feeds on tender shoots and young leaves, causing small black spots. As these lesions grow, they can lead to holes in the leaves, resulting in incomplete top foliage. This condition is known as “breaking head madness.†The most serious damage occurs during the flowering and bolling stages, with greater harm to reproductive organs compared to other pests like the green-lipped stink bug.
The second half of June marks the peak of the second generation of blind stink bugs. The main reason for this surge is that during the Meiyu season, continuous rain prevented farmers from applying pesticides in time, leading to missed opportunities for effective control. As a result, the population of the second-generation blind stink bugs remains high. According to field surveys, some areas report around 100 insects per acre, with 10–20 of them causing visible damage. Due to the large numbers of second-generation blind stink bugs and the upcoming rainy weather, the third generation is expected to appear around mid-July 15th, with moderate infestation levels.
Given the high population of the second-generation blind stink bugs, the focus now should be on controlling the third generation. Farmers are advised to apply insecticides when the cotton nymphs are 2–3 years old, using continuous applications over 2–3 rounds. In Jiangsu, control measures began around July 10, with the first application between July 10–15, targeting the green-lipped stink bug. A second treatment after 7–10 days should focus on the black-clawed stink bug. Whether a third application is needed depends on the residual insect population in the field. Typically, the combined control of the third generation of blind stink bugs, along with corn borers and cotton bollworms, takes place between July 27–28.
Pesticides such as 40% chlorpyrifos emulsifiable concentrate diluted at 500 times, 50% malathion EC at 1000 times, 40% omethoate EC at 1500–2000 times, and 40% phoxim EC at 1000 times are commonly used. Chlorpyrifos is particularly effective due to its fast-acting nature and long-lasting effect, making it a popular choice among farmers. It’s crucial to follow these guidelines closely to minimize crop losses and ensure sustainable management of pest populations.