How to control rice brown planthopper and white-backed planthopper?

How to control rice brown planthopper and white-backed planthopper? Please introduce the method that brown planthopper occurs at grade 5 in two consecutive years, and has strong resistance to insecticide, while white-backed planthopper occurs in grade 3 to 4 in a row for many years. The main factors affecting the occurrence are migration and climatic conditions in summer and autumn. The outbreak of brown planthopper in Vietnam in the winter of 2006 indicates that there is a large number of insect sources in China this year, but there are no insect-resistant varieties in production at present, coupled with the postponement of rice growth period, it will be beneficial to the later occurrence of brown planthopper. Therefore, if the immigration conditions and summer and autumn climate are suitable in 2007, it is expected that the occurrence of brown planthopper will reach grade 4-5, slightly lighter than last year or similar to last year, and the occurrence area of white-backed planthopper and brown planthopper will reach 75 million mu. In order to control rice planthopper, we should adhere to the control strategy of "control up and down", adjust the kinds of drugs, improve the quality of drug use, and ensure the control effect. The main results are as follows: (1) adhere to the prevention and control strategy of "governance above and pressing down". "governing up and pressing down" is an economic and effective way to control contemporary harm and reduce the pressure of prevention and control of the next generation. in the past two years, our province has always insisted on the control of the fifth (2) generation and the sixth (3) generation of brown planthopper. As a result, the occurrence base of six (3) and seven (4) generations was greatly reduced, the pressure of prevention and control in the later stage was reduced, and the initiative of prevention and control was won. (2) adjust the type of medicine. Due to the high resistance of brown planthopper to imidacloprid, imidacloprid should be discontinued, chlorpyrifos and dichlorvos should be used alternately, new pesticides such as imidacloprid should be demonstrated and promoted, and pyrethroids and methamidophos pesticides should be banned to control the use of triazophos. It should be noted that imidacloprid can still be used in fields dominated by white-backed planthoppers. Can use 5% fipronil 30g 50ml per mu, or 40% chlorpyrifos 80ml 100ml, or 20% isoprocarb 150ml, or 25% buprofezin 50g 60g, plus water spray control. (3) to improve the quality of drug use. Because of the good control effect of chlorpromazine and Ruijin on young nymphs, it is required to control the appropriate period from the peak of egg hatching to the peak of young nymphs, use sufficient water, hit the right position, spray large amount of water, and keep the water layer in the field for a period of time after the medicine. improve the control effect. Such as lack of water in the field, and mainly elderly nymphs and adults, can be fumigated with dichlorvos poisonous soil. Click to get more rice planting techniques click to get more food crop planting techniques