Rice field pests and diseases tend to be concentrated and cover a small area, making it an ideal time for pest control. In our region, the main pests in Putian include Laodelphax striatellus (small brown planthopper), aphids, rice locusts, black streaked dwarf disease, and stripe leaf blight. This year, there is still a possibility of a rice virus disease outbreak, which remains a key focus for prevention and control during the seedling stage. The trend of borers is increasing, so we must pay close attention. It is important to continue publicizing awareness and providing technical guidance, while implementing comprehensive measures to manage pests such as the small brown planthopper in rice fields, ensuring the safety of rice production.
First, the trends of pests and diseases in Putian
　　 1. The first generation of rice virus disease in wheat fields is showing a light trend. According to surveys conducted in mid-May, the density of the first generation of gray planthoppers was only 1-2 heads per square foot, the lowest level in the past decade. However, as the wheat harvest season approaches, gray planthoppers are migrating to Putian. Considering that Laodelphax striatellus has multiple host plants and there are many insect sources in the area, the threat of rice virus disease to rice crops still exists. Local authorities must overcome any complacency and seize this critical period to implement comprehensive control measures with appropriate chemicals.
　　 2 . Rice locusts and mites have declined. According to the survey results at the end of March, the number of winter worms in the rice fields was 220 to 310 per acre, significantly lower than the same period last year. The population of three types of mites was also light, indicating a low risk of infestation.
In addition, pests such as rice gall midges and rice weevils are also common in Putian, so it is essential to maintain good monitoring and management practices.
Second, recommendations for prevention and treatment
　　 1. Guiding principle: Focus on controlling gray planthoppers, and also treat other pests like rice weevils, rice locusts, and aphids.
　　 2 , timing and frequency of application.
The first application should be done before May 30 or after transplanting, removing the film (or non-woven fabric) from the dry seedbed, and applying the medication one day later. The second application should be 1-2 days before transplanting. In Putian, when using insect-proof nets, they should be installed immediately after removing the film (or non-woven fabric). A single application 1-2 days before transplanting is sufficient.
　　 3 , unified pesticide formula.
To control gray planthoppers: Apply 30% imidacloprid wettable powder (30g per 40kg water) using a backpack sprayer (20kg spray). Alternatively, use a mist sprayer (20kg spray). Spraying the weeds around the edges of the fields is also recommended, as these areas may harbor gray planthoppers.
For borer control: Apply 20% emamectin benzoate or 48% chlorpyrifos 1-2 days before transplanting, using 5ml of 90% chlorpyrifos per 10 liters of water. This will help prevent infestations in the early stages of growth.
Third, matters needing attention
　　 1. Imidacloprid is highly toxic to fish, so strict safety precautions must be taken to prevent runoff into fish ponds.
　　 2 , emphasize following the correct dosage to ensure effective control.
　　 3 , for live-seeded rice fields, it is crucial to apply treatments against gray planthoppers immediately after sowing and emergence.
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