Technical Tips for Prevention and Control of Rice Planthoppers
The appropriate period for pest prevention and control will be implemented immediately before and after September 10. Once pests are detected, treatment should be carried out as soon as possible, ideally within one week. In key areas, such as the Huaibei and Jianghuai rice regions, late-maturing single-season rice will be prioritized for control. Additionally, double-season rice and late-maturing single rice along the Yangtze River will also be included in the prevention and control plan.
The prevention and control thresholds are set at 100 or more young nymphs per square meter, and over 1,000 nymphs per square meter. To effectively manage the pests, several prevention techniques will be applied. For newly hatched nymphs, a mixture of 25% ciprofloxacin (80 g per mu) and 40% chlorpyrifos (100 ml per mu) can be used, or alternatively 48% emulsifiable concentrate (80 ml per mu). For middle-aged and older nymphs, the recommended mixture is 40% chlorpyrifos (120 ml per mu) or 48% emulsifiable concentrate (100 ml per mu), combined with 15–20 g of Silk Run per mu.
When applying pesticides, it is crucial to ensure sufficient water volume. For late-maturing single-season japonica rice, manual sprayers should use no less than 60 kg of water per mu, while motorized sprayers should use at least 30 kg. For single-season japonica rice, manual sprayers must apply no less than 40 kg of water per mu, and motorized sprayers should not use less than 15 kg. The pesticide should be sprayed on the lower parts of the rice plants, and the field should maintain shallow water for 3 to 5 days after application to enhance effectiveness.
For dry land or fields without standing water, an effective method involves using 80% dichlorvos (300 ml per mu) mixed with 15–20 kg of dry sand or soil. This mixture should be distributed between 12:00 PM and 2:00 PM on sunny days to maximize its efficacy. These measures aim to ensure comprehensive pest control and protect crop yields during critical growth stages.
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