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Early prevention and treatment of rape sclerotia and aphids
According to recent surveys by regional stations, there are sufficient bacterial sources in the field of Sclerotinia sclerotiorum in our province, and the disease resistance of the varieties is not strong. The rainfall of the rapeseed during weather forecast is high, and it is expected that the occurrence of Sclerotinia sclerotiorum is moderate, and the occurrence of partial occurrence along the south of Jiangsu Province The degree of occurrence was slightly heavier than last year. In addition, the occurrence of rapeseed in most areas was slightly higher than normal. Prevention and control of rapeseed sclerotinia and aphid are key measures to ensure rapeseed yield and quality, and should be used to catch rape during the flowering period in mid-April. The flowering period of rapeseed (the flowering rate of primary branch stems is 50%, and the flowering rate of the main stem is 80%-100%) is the key period for the prevention and treatment of sclerotinia. If the control effect is missed due to missed prevention and control period, the appropriate period should be maintained. Take the initiative to attack and comprehensively use the "control strategy." For areas with heavy sclerotinia and locust occurrence, a second prevention and control will be carried out 5-7 days after the first prevention and control to ensure control of hazards and timely treatment in case of rain. Sclerotinia, 50% procymidone WP (sulfacin) 60g, 40% sclerotin WP 100-150g, or 50% iprodione wettable powder (following sea) 100g, or 50% carbendazim WP 150-250g, or 50% bacillus wettable powder 80-100g, or 50% ethenobacterial WP 100g spray. Sclerotinia carbendazim should be discontinued in areas where carbendazim has become resistant to carbendazim. For controlling aphids, imidacloprid, anti-indolyl, acetamiprid, and pymetrozine can be used. With a sufficient amount of water, the mist sprayer will spray 20 kg of water per mu, and the manual low volume fine spray will use 40-50 kg of water per mu. Align the lower part of the stem of the rape with the shoots. At the same time, the management of the fields should be strengthened, clearing the ground in time, and timely removal of diseased leaves, yellow leaves and old leaves. Take out of the field and destroy it to prevent re-infection of pathogens and reduce the occurrence of disease.