What kind of medicine is used to beat the gray planthopper at the panicle stage of rice?

What medicine does rice panicle stage small rice planthopper use to hit? Please introduce the following drugs for Laodelphax striatellus at rice panicle stage: Laodelphax striatellus can not only cause rice stripe disease by virus transmission, but also concentrate on panicle damage at late panicle stage. The experiment was conducted with 6 treatments: 40% chlorpyrifos emulsifiable concentrate 100ml, 10% nitenpyram 30ml, 10% chlorthialin WP 30g, 25% pymetrozine WP 20g, 25% buprofezin WP 75g and water control. When the rice is in filling stage, spray with manual sprayer according to 50 kg of water per mu. The generation overlap of Laodelphax striatellus was obvious, and the young nymph accounted for 58.3%. The results showed that chlorpyrifos and pymetrozine had ideal control effect on the panicle of Laodelphax striatellus, the former had good quick-acting effect, the latter had better persistent effect, nitenpyram had second control effect, chlorthialin and buprofezin had poor control effect on the panicle of Laodelphax striatellus. Pymetrozine can effectively control the damage of Laodelphax striatellus at heading stage by one application, and chlorpyrifos should be added once. According to monitoring, the high temperature in July and August has an inhibitory effect on the brown planthopper, and the reproduction is accelerated after the weather turns cool in September. The suitable period for controlling the brown planthopper at heading stage is about 7 days after heading (middle and late September). It is suggested that pymetrozine should be used alternately with chlorpyrifos and dichlorvos in production to delay the emergence of resistance; chlorpyrifos or dichlorvos should be mixed with pymetrozine in high occurrence years to enhance the quick and persistent resistance. 25% Pymetrozine WP was sprayed with 20g/mu and 50kg/mu water to control Laodelphax striatellus at late heading stage. Click for more pesticide application techniques Click for more pesticide application techniques Click for more rice cultivation techniques