Control time of rape sclerotinia rot

Sclerotinia sclerotiorum may occur in the whole growth stage of rapeseed, and the incidence is higher in the seed-setting stage, and the initial control time is sowing and the early stage of sclerotia disease occurrence, at this time, the application of biological agents can effectively reduce the number of sclerotia in the field, and the important stages of control are the initial flowering stage and full flowering stage, according to the degree of the disease, carbendazim, carbendazim, Sclerotinia sclerotiorum and other pesticides can be used for control.

1. Control time of Sclerotinia sclerotiorum in rape

1. Sclerotinia sclerotiorum will occur during the whole growth period of rapeseed, but the incidence is relatively high in the fruiting stage. When sowing rape in winter in southern China, a few Sclerotinia sclerotiorum will occur in October-December, and most of them are more serious in March-April of the second year.

2. When sowing rape in northern China, Sclerotinia sclerotiorum usually occurs from March to May. In recent years, because there are more Rain Water in summer, the incidence of Sclerotinia sclerotiorum is also high when spring rape is planted in the northwest.

3. Therefore, we can choose to apply biological agents in the early stage of Sclerotinia sclerotiorum during sowing, which is beneficial to reduce the number of Sclerotinia sclerotiorum in the field. The important period for the control of Sclerotinia sclerotiorum is in the initial flowering stage and full flowering stage, during which carbendazim, carbendazim, Sclerotinia sclerotiorum and topiramine can be deployed according to the degree of the disease.

II. Agricultural control measures of Sclerotinia sclerotiorum in rape

1. To plant varieties with strong disease tolerance, one is to carry out flood-drought rotation and soak and rot the sclerotia that remain in the soil through irrigation, so as to reduce the source of infection, and the other is to deal with the residual plants in time and thresh the rape after threshing. The stems, branches, leaves, pods, etc., are treated alone or put into field retting to make fertilizer.

2. Third, deep ploughing soil sterilization, deep ploughing in autumn, and then ploughing and cultivating soil for 1-2 times in spring can eliminate and submerge the vesicles. Fourth, seeds can be treated by screening and chemical dressing to eliminate sclerotia and kill seed epidermis, and then sow.

III. Pesticide control measures of Sclerotinia sclerotiorum in rape

The main results are as follows: 1. While carrying out agricultural control, chemical agents can also be used to control and reduce the incidence of Sclerotinia sclerotiorum disease. in order to improve the control effect, it is necessary to master the dosage and select suitable drugs for prevention and treatment. at present, the main fungicides commonly used are carbendazim, sclerotiorum, carbendazim, topurazine and other fungicides.

2. Because rape is susceptible to Sclerotinia sclerotiorum at flowering stage, you can choose to spray once at the early flowering stage, and the second time after 7-10 days. After spraying twice, if you encounter continuous overcast and rainy weather, you need to spray one more time, which is beneficial to improve the control effect. When using the medicine, the amount of water is 50-60 kg, you can spray coarse spray properly, and you need to spray from the flower to the base of the stem. Resulting in the formation of a protective layer on the surface of the plant.