Rice field pest control opinions

Effective management of rice pests in paddy fields is crucial for cultivating high-quality rice, improving seedling quality, and achieving higher yields. In recent years, Wujiang District has made significant progress in reducing the occurrence of rice stripe disease by implementing comprehensive control measures such as using non-woven fabric covers. However, in some areas, waterlogged transplanted fields still face serious issues due to inadequate prevention and control efforts. Based on an investigation and comprehensive analysis of the epidemic factors of stripe leaf blight this year, it is clear that rice stripe disease in Wujiang District in 2013 remains a major concern. The disease shows a growing trend in its prevalence. To effectively manage the risks posed by viral diseases transmitted by Laodelphax striatellus and ensure a bountiful rice harvest, the following preventive measures are recommended.

First, the trend

　　 1. Laodelphax striatellus and stripe leaf blight: Laodelphax striatellus serves as a vector for spreading viral diseases like rice stripe disease. According to the survey conducted by Wujiang Plant Protection Station in May, the average number of planthoppers per square foot was 0.37, with 7.7% being nymphs, 38.5% being second instar, and 46.2% being adults. Based on developmental progress, it is expected that the first generation of larvae will emerge between May 27 and the end of May, with the peak migration period likely to occur at the beginning of June. This could significantly increase the risk of disease outbreaks in the region. Additionally, with the increasing area of wheat cultivation, the breeding and multiplication of larvae have also increased, raising the pressure on rice pest control. It is anticipated that rice stripe disease may re-emerge this year.

　　 2 , Daxie: The occurrence and damage caused by large cockroaches are becoming more severe. First, the overwintering insect population is high, with an estimated 307.1 insects per mu, which is five times the average of the past ten years. Second, the light trap catches were exceptionally high, with a total of 408 adults caught by a single lamp up to May 20, which is nearly four times the average from the past decade. Some early sowing and transplanting fields should not be overlooked.

Second, prevention and treatment opinions

Controlling planthoppers and locusts in the field is essential for managing rice pests. These measures can serve multiple purposes, reduce pesticide use, lower agricultural costs, and support pollution-free farming. Therefore, all localities must focus on preventing and controlling the spread of these pests.

　　 1. Water culture transplanting rice fields should be treated three times this year. Planthopper migration is expected to peak around mid-May to early June. The first application should be at the end of May, targeting the main migration peak of planthoppers. Treatment methods include 25% pymetrozine suspension at 20 grams per 50 kg of water. The second application should be during the young nymph peak between June 8 and 10, using 25% pymetrozine SC (20 grams) and 20% avermectin + triazophos (70 ml), sprayed at 50 kg of water. The third application before transplanting (2-1 day before) should also use similar formulas to target the second generation of nymphs, rice thrips, and borers.

　　 2 , dry breeding rice application methods. The first treatment should be done in time before and after June 5, applying 25% pymetrozine SC (20 grams) and 20% avermectin + triazophos (70 ml) per 50 kg of water. This targets the second generation of nymphs and controls rice locusts and mites. The second application should be 2-3 days before transplanting, using "get-up pills" and applying pesticides directly to the seedlings.

　　 3 , machine insertion. After removing the film, apply medicine promptly. Transplanting should be completed by June 10, and within 7-8 days after transplanting, apply 25% pymetrozine SC (20 grams) and 20% avermectin + triazophos (70 ml) per 50 kg of water to control pests.

　　 4 , direct seeding rice: Apply medicine about 7 days after sowing. Use 25% pymetrozine suspension (20 grams) plus 20% flash 螟 (70 ml) and 48% water, spraying 50 kg of water. Early-seeded rice should receive two applications for better control.

　　 5. Strengthen management of diseased fields. Remove infected plants promptly to reduce disease sources. Increase the number of plants per hole during transplanting to ensure sufficient seedlings. For heavily affected fields, enhance fertilizer and water management, utilize the strong tillering ability of rice, and apply tiller fertilizer early to promote growth and ensure effective panicle numbers.

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