Control of Sclerotinia sclerotiorum in spring

Sclerotinia sclerotiorum is the main disease of rape, so we must pay attention to prevention and control, reduce the harm and reduce the loss. Symptoms: when the disease occurred, the disease spot of rape leaves was round or irregular, the center was grayish brown or yellowish brown, the middle was dark cyan, and the outer edge was yellow halo. When dry, the disease spot is ruptured and perforated, but when it is wet, it expands rapidly, the whole leaf decays and white hyphae grow on it. The disease spot on the stem is fusiform, slightly sunken, white in the middle and brown at the edge. Under moist conditions, the disease spot develops very rapidly, and white hyphae grow on it. In the late stage of the disease, the stem pith was eroded, the cortex was longitudinally split, the vascular bundles were exposed, the roots were easily broken, and many black granular sclerotia were formed in the stem. The seriously diseased plant withered and died. Control measures: it can be controlled when the flowering rate of the main stem is more than 95% and the flowering rate of the first branch is about 50%. It should be noted that Sclerotinia sclerotiorum has generally developed resistance to carbendazim, and the effect of using Sclerotinia sclerotiorum, Pythium, Promethazol, propiconazole, propiconazole and its compound is better. 40% Sclerotinia net wettable powder 100g 150g per mu, or 50% carbendazim) 35g / mu wettable powder can be used to control water spray. You can also spray water with 25% per mu, such as 40g / mu, 100g / mu, 50g / mu, 100g / mu, 25g / mu, 25g / mu, 50g / mu, 25g / mu, 25g / mu, 50g / mu, 25g / mu, 50g / mu, 25ml / mu, 50g / m In the full flowering stage of rape, the yellow leaves, old leaves and diseased leaves of the whole plant were removed, and the picked leaves were taken out of the field for treatment.