First, manual egg collection is an effective initial step in managing cotton bollworms. Since the majority of these pests tend to reside inside the bolls of insect-resistant cotton, it's crucial to promptly remove and manually destroy them in those fields. In other cotton fields and tomato fields, eggs can be collected during pruning or harvesting. This process helps eliminate the larvae before they develop further, and any remaining leaves should be taken out of the field for proper disposal and treatment.
Second, it's essential to apply chemical treatments at the right time based on scientific guidelines. Here are the control indicators and methods:
1. In insect-resistant cotton fields, if there are more than 10 third-instar larvae per 100 plants, it's time to apply pesticides. 2. For non-insect-resistant cotton and other crops, if there are 40 eggs per 100 plants or 100 young larvae, immediate action is required. Pesticide options include: (1) 25% Huifeng Cock Mu at 40ml or 25% Fast Kill Ling Mu at 50ml mixed with 70kg of water. (2) A 1:1 mixture of chrysanthemum-based and organophosphorus pesticides can also be used effectively. 3. In vegetable fields, if there are 20–30 eggs per 100 plants, you can spray with BT preparations diluted 200 times, 1.8% abamectin diluted 300 times, or 5% Sodium Tetrachloride EC diluted 2500 times.
Important precautions to consider: 1. During the three generations of cotton bollworm control periods, the cotton plants grow tall, so spraying must be thorough and cover all areas. The amount of pesticide solution should not be less than 70kg per acre. 2. It's best to spray early in the morning before 10 o'clock or late in the afternoon after 4 o'clock. Spraying during midday is strictly prohibited to avoid pesticide poisoning. 3. After applying the treatment, monitor the results closely. If the effect is unsatisfactory or if rain occurs within 6 hours, a second application should be made immediately to ensure effective control.
This approach combines both manual and chemical strategies to manage cotton bollworm infestations efficiently while minimizing environmental impact and ensuring safety for workers.Plant Extract,Papaya Leaf Extract,hops extract amazon,Hypericum Perforatum Extract
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