Rice field pest control opinions

Effective management of rice pests in paddy fields is crucial for cultivating high-quality rice, improving seedling health, and ensuring a bountiful harvest. In recent years, Wujiang District has significantly reduced the occurrence of rice stripe disease by implementing comprehensive control measures such as using non-woven fabric covers. However, in some areas, waterlogged transplanting fields still face serious issues due to insufficient prevention and control efforts. According to investigations and analyses of epidemic factors this year, the rice stripe disease in Wujiang District in 2013 remains significant, with a growing trend in its prevalence. To effectively manage the threat of major viral diseases transmitted by Laodelphax striatellus and ensure a successful rice harvest, the following prevention strategies are proposed.

First, the trend analysis

　　 1. Laodelphax striatellus and rice stripe disease: Laodelphax striatellus is a key vector for spreading viral diseases like rice stripe disease. According to the survey conducted by the Wujiang Plant Protection Station on wheat fields in May 20, the average number of planthoppers per square foot was 0.37, with 7.7% being nymphs and 38.5% being adults, while 46.2% were in the third or fourth instar stages. Based on developmental progress, it is expected that the first generation of larvae will emerge around May 27 to the end of May, with the migration peak occurring at the beginning of June. This could greatly increase the risk of disease transmission in the region. Additionally, with the continuous expansion of wheat cultivation, the breeding population of planthoppers has increased, raising the pressure on rice pest control. It is expected that rice stripe disease will show a recurrence trend this year.

　　 2 , Daxie (large grasshopper): The occurrence and damage caused by large grasshoppers have been increasing. First, the overwintering insect population is high, with an estimated 307.1 insects per mu, which is 5 times higher than the average over the past 10 years. Second, light trap data shows that from May 20 to the end of the month, a single lamp trapped up to 408 adults, which is nearly four times the average of the past decade. Some early-sown fields are especially concerning.

Second, prevention and treatment recommendations

Controlling planthoppers and locusts in the field is critical for effective pest management. These measures not only help reduce pesticide use and agricultural costs but also support pollution-free farming. Therefore, local authorities must take these preventive actions seriously.

　　 1. Water culture transplanting rice fields should be treated three times this year. Planthopper migration is expected to peak in early June. The first treatment should be at the end of May, targeting the main migration wave. Use 25% pymetrozine suspension at 20 grams per 50 kg of water. The second treatment should occur between June 8–10, targeting the young nymph peak. Apply 25% pymetrozine SC at 20 grams plus 20% avermectin + triazophos at 70 ml (1 bottle) in 50 kg of water. The third treatment should be applied 2–1 days before transplanting, targeting the second generation of nymphs and other pests.

　　 2 , dry seeding methods. Apply pesticides promptly before and after June 5. Use 25% pymetrozine SC at 20 grams plus 20% avermectin + triazophos at 70 ml (1 bottle) in 50 kg of water. This helps target the second generation of nymphs and pests like locusts and mites. The second application should be 2–3 days before transplanting, using "get medicine" techniques during seedling growth.

　　 3 , machine planting. After removing the film, apply a good pesticide immediately. Transplanting should be done within 7–8 days after June 10, followed by another round of pesticide application. Use 25% pymetrozine SC at 20 grams plus 20% avermectin + triazophos at 70 ml in 50 kg of water.

　　 4 , direct-seeded rice: Apply medication about 7 days after sowing. Mix 25% pymetrozine suspension at 20 grams with 20% avermectin + triazophos at 70 ml in 50 kg of water. For early-sown fields, repeat the treatment twice.

　　 5. Strengthen management of infected fields. Remove diseased plants promptly to reduce pathogen sources. Increase the number of plants per hole during transplanting to ensure sufficient seedlings. For heavily infected fields, improve irrigation and fertilization to maximize tillering potential and promote effective panicle development.

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