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Sesame aphid damage and prevention method
Sesame aphids, also known as peach aphids or haze aphids, are a widespread pest found throughout the country. These insects can infest over 170 plant species, including sesame, tobacco, and various vegetables. When they attack sesame plants, they gather on the undersides of young leaves, feeding on the sap and causing the leaves to curl, which hinders plant growth and development.
**Life Cycle and Infestation Patterns:**
Sesame aphids have more than 20 generations per year. They overwinter in the buds or cracks of peach trees. In spring, they migrate to sesame fields, with heavy infestations typically occurring in early sesame crops. The damage becomes noticeable in mid to late June, peaks in July and August, and then declines. By September, the aphids move to vegetable crops, and by mid-October, winged females return to peach trees to mate with males, preparing for the next winter cycle.
**Control Measures:**
1. **Overwintering Control:** During early winter or spring, treat peach trees with 40% dimethoate EC diluted at 2000 times to reduce the number of overwintering aphids effectively.
2. **Field Application:** To manage aphid populations in the field, apply one of the following insecticides: 50% imidacloprid diluted 2000–3000 times, 25% cypermethrin EC diluted 2000 times, or 25% deltamethrin EC diluted 3000 times. Ensure even spraying over the affected areas for optimal results.
By implementing these strategies, farmers can significantly reduce the impact of sesame aphids on their crops and maintain healthier plant growth. Regular monitoring and timely intervention are key to effective pest management.
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