Rape cultivation: how to control Sclerotinia sclerotiorum?

What are the hazards of Sclerotinia sclerotiorum? How to prevent and cure Sclerotinia sclerotiorum? Please guide the harm of Sclerotinia sclerotiorum: rape seedling Sclerotinia sclerotiorum spot mostly occurs at the junction of the ground rhizome, forming reddish-brown spots, then expand to withered white, tissue wet rot, white flocculent hyphae grow above. After the disease class revolves around the stem, it causes stem rot, seedling death, and many black sclerotia are formed outside the diseased tissue. The disease occurred in the leaves of rape at the adult stage, showing a round or irregular waterlogged spot, the center of the spot was grayish brown or yellowish brown, the edge of the spot was dark cyan, slightly wheeled, the edge of the spot was chlorotic, the outer edge was yellow halo, the spot was ruptured and perforated when dry, and expanded rapidly under wet conditions, the whole leaf rotted and white hyphae grew on it. Rape stem disease first appeared fusiform light brown water stains, slightly sunken, white in the middle, with brown rims on the edge. Under wet conditions, the disease spot developed rapidly, white hyphae grew on it, and at the late stage of the disease, the stem epidermis was damaged, the vascular bundles were exposed in a filamentous shape, the pith was hollow and easy to lodge, and many black mouse fecal sclerotia were formed in the stem. In severe cases, the whole plant withered, some of the mildly diseased plants withered or matured early, and the seeds were not full. The petals of rape became pale yellow after being infected, and then turned to white. After the pod is infected, irregular white spots are produced, and small and round sclerotia can be formed inside and outside the pod. After the seed is infected, the surface is rough, gray, dull or becomes irregular blighted grains. Control methods of Sclerotinia sclerotiorum 1. Agricultural control: cultivate and select varieties with strong disease tolerance. The first is to implement the rotation of flood and drought. Through irrigation, the sclerotia remaining in the soil will be soaked and rotted to reduce the source of infection; the second is to deal with residual plants. After the rape was threshed, the stems, branches, leaves and pods were separately treated or put into the paddy field to rett to make fertilizer; the third is deep ploughing and sterilization. Deep ploughing in autumn and ploughing for 1-2 times in spring can break and submerge the vesicle disk; fourth, seed treatment. Through screening, air selection, seed dressing and other methods to eliminate sclerotia and kill seed epidermis, sow disease-free seeds. 2. Chemical control: while carrying out agricultural control, the timely use of chemical and chemical control is the key technical measure to control and reduce the harm of Sclerotinia sclerotiorum disease. according to years of experience, in order to ensure the effect of disease prevention, we must take the right medication period and choose the right medicine. adopt the correct method of medication. At present, the main kinds of fungicides commonly used are carbendazim, carbendazim, sclerotiorum, topurazine and various fungicides compound pesticides. Because rape is most susceptible to disease is the flowering stage, that is, it is very important to use the first drug well in the early flowering stage, the second drug should be used well after 7-10 days, and if there is a continuous rainy day after the second drug, we should also try to use the medicine for the third time. In order to ensure the effect of disease prevention, we should insist on spraying 50-60 kg of sufficient water when using the medicine, and spray it everywhere from the flower to the stem at the base, so as to form a protective layer on the surface of the plant. Click to get more rape planting techniques click to get more vegetable planting techniques