The cotton blind bug, a harmful pest in the Hemiptera family, is known for its piercing-sucking mouthparts and rapid movement. Both nymphs and adults are covered with a waxy layer, making them hard to detect and control. After extensive testing of various pesticides on the market, we found that the most effective combination is phoxim and malathion. Virulence tests showed a 100% mortality rate within two hours, while lab results recorded a corrected mortality rate of 98%, and field trials achieved 95%. These results placed the combination at the top among tested products.
Phoxim is a highly effective but low-toxic insecticide with strong knockdown power against the blind bug. However, it has a short residual effect, which may allow the pests to recover if used alone. Malathion, on the other hand, offers three modes of action: stomach poisoning, contact killing, and fumigation. It is a broad-spectrum insecticide with longer-lasting effects, though its initial knockdown is not as fast as phoxim’s. Together, they complement each other well, making them an ideal choice for control.
Currently, there are commercial products such as 25% octocin + malathion and 20% benzothiazide produced by the Langfang Nori Agricultural Pesticide Plant. These formulations include penetrants and synergists for better performance. If these products are unavailable, mixing phoxim and malathion yourself can also be effective. When cotton bollworms occur simultaneously, adding an appropriate amount of acephate can enhance the overall effectiveness.
The first critical period for prevention and control occurs in mid to late May, when one or two bugs per hundred strains are detected. This is the earliest stage to start treatment. The second key period is in mid to early June, during the budding stage, when the second generation of green nymphs begins to emerge. Many adult bugs migrate into cotton fields, and infestation rates can reach up to 3–5%. At this point, close monitoring and timely treatment are essential. Since the first and second generations appear relatively neatly, prompt intervention makes control easier.
From late June onward, overlapping generations become more common, and the life cycle boundaries become less distinct. Cotton fields begin to close, making inspections more difficult. Regular checks of the main stem and fruit branches are necessary, especially for newly damaged areas. When the infestation rate reaches 5–10% (more than five insects per 100 strains), immediate action is required. Control should be carried out every seven days until late September.
For general management, thorough treatment is essential, ensuring no pests are left behind. These pests have high fertility, can hide from light, and move quickly, making them challenging to control. Adults live for a long time, laying eggs just one or two days after emerging. The egg-laying period lasts 30–40 days, with each female laying about 37 eggs. The egg stage typically lasts six to seven days, and the pest remains active from mid-May until the first ten days of October—nearly 140 days of potential damage.
In addition to pesticide application, a unified defense strategy is crucial. First, household-level control helps prevent the spread of infestations. Second, removing weeds around the field and managing surrounding hosts reduces the risk of re-infestation. Third, after treatment, residual pests must be controlled below the threshold level. If the infestation is heavy, repeated treatments are necessary to prevent the population from growing and to avoid further damage to the cotton crop.
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