The fifth generation of rice planthopper The younger nymphs are expected to occur in the first half of September, and the fifth generation of rice planthoppers is expected to be moderately heavy (level 4). Main basis: less insects in the field. The city station investigated in late August, and the number of hundred worms in the middle rice field has been reduced to less than 100, the number of larvae in the late rice fields is around 200, and the brown planthopper accounts for 30%. At the same time, after the mature rice harvest, a large number of rice planthoppers will be transferred to the late rice fields. In addition, a large number of foreign insect sources will be moved into the local area in September, which will focus on late rice. In addition, the weather forecast in September has a lot of precipitation, the temperature is low, and the cold dew wind is in the middle of September, which is conducive to the occurrence and damage of rice planthoppers. The fourth generation of rice leaf roller This year's fourth-generation rice vertical larvae are in the early September, and it is expected that the city will be moderately heavy (level 4). The main basis: the amount of moths in the field is large. According to the city station survey, the average amount of moths in late-maturing mid-season and late-maturing rice in late August is about 500. The average amount of moths in the late rice fields in each county is less than 500; the amount of insects in the field is large. This year's 1-3 generations of rice leaf roller are lighter in our city, and the amount of insects in the field is small. However, since the end of August, the number of insects in the fields has surged. The city station surveyed from August 25 to 29, and the number of worms in the double-night field reached more than 100; the climatic conditions were conducive to the occurrence and damage of rice leaf roller. Late rice disease 1. Sheath blight: It is expected that moderate weight will occur (level 4). 2. Rice blast: It is expected to occur moderately (Grade 3). 3. Rice smut disease: It is expected to occur in the city (level 3). Prevention opinion The key targets for prevention and control in September were: rice planthopper, rice leaf roller, rice stem borer, sheath blight, rice false disease, rice blast and so on. For the prevention and control of stem borer, stem borer and rice leaf roller, 10% flubendiamide sc, 20% chlorantraniliprole sc and the like can be used. For the early stage, the field of young larvae has been added with organophosphorus pesticides such as Rosburn; the control of rice planthoppers uses 25% pymetrozine sc, 25% buprofezin wp, 50% nitenpyram sg, etc.; When the disease rate of the sheath blight is 30%, spray control with 24% thiofuramide sc, 20% jinggangmycin wp, etc.; rice blast susceptible varieties should be the focus of prevention and control. 40% Fuji No. 1 ec100ml / mu, 20% tricyclazole wp75g / acre, 25% amishida 30-40ml / acre, 2% Chunleimycin, etc.; rice smut in the rice before the break 7 10 days, use Ai Miao, 20% Jinggangmycin wp60-80g / acre to prevent the first time, and then prevent the second time after 7 days. More pesticide knowledge , please pay attention to China Pesticide Network Led Integrated Emergency Device Led Lamp Automatic Emergency Device,Led Automatic Emergency Device,Led Emergency Device,Led Light Emergency Device,Emergency Driver For Led Lights Foshan Nai An Lighting Electric Co.,ltd , https://www.naipsled.com.jpg)