At present, we must pay attention to cotton blindness

This year's cotton pest situation has shown some differences compared to previous years. During the majority of the cotton growth cycle, the first and second generations of bollworms have not caused significant damage. In fact, there have been no large-scale infestations of bollworms. However, during the later stages of growth, some farmers focused only on controlling Fuxi (a type of pest), while neglecting other potential threats. This oversight can be costly, as late-season pests often play a critical role in reducing yield. Among these pests, the blind stink bug stands out as one of the most damaging. Belonging to the order Hemiptera, these pests have high reproductive capacity and can cause damage from mid-May through early October. If left unchecked, they can lead to substantial yield losses. Based on field experience and long-term guidance, I have developed a set of effective strategies to help cotton farmers manage blind stink bugs more efficiently: First, focus on prevention. Centralized control is essential to prevent the spread of pests across fields. Agricultural measures such as removing weeds and maintaining proper field management can significantly reduce pest populations. It’s also important to ensure thorough treatment. Each application should aim for a "clean, complete, and residue-free" result. After treatment, regular inspections are necessary to keep pest numbers below the threshold. When infestations are high, repeated treatments are required to prevent the pests from reproducing and persisting in the field. Second, timing is crucial. Blind stink bugs typically have five to six generations per year. The first key period for control is in mid to late May, when the rate of new infestations reaches 1%-2%. At this point, it's time to start treatment. The second critical window comes in mid-June, when the infestation rate rises to 3%-5%, and each hundred plants contain 3-5 insects. At this stage, increased control efforts are needed. The first two generations are relatively easy to manage if treated promptly. However, starting in late June, the third generation begins, and the population becomes more complex, with overlapping generations making control more challenging. Farmers should check the tops of main stems and fruit branches regularly. If 5%-10% of the plants show signs of infestation, and there are 5 or more insects per 100 plants, immediate action is necessary. Treatments should be done every 7 days until the end of September. Third, the choice of pesticide plays a vital role. Through repeated trials, phoxim and malathion have proven to be the most effective combinations for controlling blind stink bugs. Phoxim is highly effective and low in toxicity, with a strong knockdown effect, but its residual effect is short. Long-term use alone may lead to resistance. Malathion, on the other hand, offers stomach, contact, and fumigant effects, making it a broad-spectrum insecticide. While it lasts longer, its initial knockdown is not as strong as phoxim. Combining both provides a balanced approach, offering the best results. Additionally, using a special product called “Crystal” is another option. Each package is diluted in 15 kg of water and provides protection for up to 20 days. These methods, when applied correctly, can greatly improve pest management and protect cotton yields.

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