Early control of Sclerotinia sclerotiorum and aphids

According to the recent investigation of various regional stations, at present, the field bacterial source of Sclerotinia sclerotiorum in our province is sufficient, the disease resistance of varieties is not strong, and the weather forecast shows that there are more Rain Water in the flowering period of rape, and it is expected that Sclerotinia sclerotiorum will occur moderately and more seriously in some areas of southern Jiangsu along the Yangtze River. the degree of occurrence is slightly more serious than last year. In addition, the number of rape aphids in most areas is slightly higher than that in normal years. The control of Sclerotinia sclerotiorum and aphids is the key measure to ensure the yield and quality of rapeseed. The full flowering stage of rape (the flowering rate of the first branch is 50%, and the flowering rate of the main stem is 80%) is the key period for the prevention and control of Sclerotinia sclerotiorum. The control effect of missing the appropriate period for prevention and control is significantly reduced, and the prevention and control strategy of "grasping the appropriate period, taking the initiative and using drugs in a comprehensive manner" should be adhered to. For the areas with heavy occurrence of Sclerotinia sclerotiorum and aphids, the second control should be carried out 5-7 days after the first control to ensure the control of the harm and timely supplementary treatment in case of rain. To control Sclerotinia sclerotiorum, use 50% carbendazim wettable powder 60 g per mu, or 40% Sclerotinia net wettable powder 100-150 g, or 50% carbendazim wettable powder 100 g, or 50% carbendazim wettable powder 150-250 g, or 50% Fu? 80-100 grams of sclerotia wettable powder, or 50% ethylene sclerotia wettable powder 100 grams spray. In areas where Sclerotinia sclerotiorum has become resistant to carbendazim, carbendazim should be discontinued. Imidacloprid, aldicarb, acetamiprid, imidacloprid and other drugs can be used to control aphids. With enough water, the mist machine uses 20 kg of water per mu, and the manual low-volume fine spray uses 40-50 kg per mu. Spray at the middle and lower part of the stem and branches of rape. At the same time, strengthen field management, clear ditches and manage soil moisture in time, and timely remove diseased leaves, yellow leaves and old leaves in the field. Take it out of the field for destruction to prevent bacteria from re-infection and reduce the degree of disease.