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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 across the country. These insects can infest over 170 plant species, including sesame, tobacco, and various vegetables. When they attack sesame plants, they typically gather on the underside of young leaves, feeding on the sap. This feeding causes the leaves to curl, which hinders plant growth and reduces yield.
**Life Cycle and Infestation Patterns:**
The sesame aphid has more than 20 generations per year. During winter, they overwinter in the buds or crevices of peach trees. In spring, they move to early sesame crops, with heavy infestations commonly occurring in early sesame plants. The damage begins around mid-to-late June, peaks in July and August, and then declines. By September, the aphids migrate 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:** In early winter or early spring, apply 40% dimethoate EC diluted 2000 times to peach trees to effectively reduce the overwintering population.
2. **Field Spraying:** To manage aphid infestations in the field, use 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 entire crop area.
By implementing these control strategies at the right time, farmers can significantly reduce the impact of sesame aphids and protect their crops from serious damage. Regular monitoring and timely intervention are key to managing this persistent pest.
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