Sclerotinia sclerotiorum, also known as sclerotinia rot, is a major disease on rapeseed in our region. In general, the incidence of stalk is about 10%, and the year of serious smut is up to more than 30%. The occurrence of Sclerotinia sclerotiorum causes rape every year. There are different degrees of loss in production. The main factors inducing the disease are the resistance of the fungus source, variety, cultivation and management, and the weather conditions of rapeseed blossoms until the week before harvest. Based on a comprehensive analysis, it is expected that the incidence of Sclerotinia disease in this year will be moderate.
First, the trend
1, field bacteria source area according to the monitoring point field monitoring, this year the sub-capsule disk than the normal year (around March 10) late. Until March 25, the number of apium discs sown with 200 sclerotia had not been investigated. It is expected that the end of March will enter the period of germination, and in mid-April, it will enter the ascending stage of ascospores, which is consistent with the flowering period of rapeseed.
2. Variety disease resistance The varieties of rape planted in our district mainly include “Huyou 50†and “Huyou 15â€, which have been planted for many years and have poor disease resistance. In case of suitable climatic conditions, the disease will be Rapidly popular.
3, rapeseed growth period The current rape has entered the initial flowering period, is expected to enter the flowering beginning of the end of March, in mid-April will enter the full flowering period, after April 15th into the rape Xiehua period, the fertility process is slightly later than in previous years. During the period of high temperature and rainy weather during the period of rapeseed flower, the disease may have a chance of disease.
4. Climate conditions According to the prediction of the city's meteorological department, the total rainfall in April this year is expected to be 60-95 millimeters, which is similar to last year (68.9 millimeters). Rain days are 9-12 days, slightly less than the normal year (18 days). Based on the analysis of the above factors, the incidence of Sclerotinia sclerotiorum in our region is moderate this year.
Second, prevention and treatment of rape Sclerotinia disease prevention and treatment must be based on prevention, adhere to the "catch the appropriate period, take the initiative, comprehensive protection of the drug" prevention and control measures, once the disease occurs in rape, symptoms appear on the stem, and then take control Measures, the effect is poor. The township plant protection departments should strengthen publicity, scientifically guide the use of drugs, do a good job in the prevention and treatment of Sclerotinia sclerotiorum, and strive to harvest high yields of rapeseed.
(1) Control objects: all rape.
(2) The appropriate control period: The flowering period of rape is about the beginning of April. In case of rainy weather, prevent it once every 7-10 days.
(3) Control agent: Mu 50% carbendazim WP 150g, or 25% polyketone (Gibberellin) WP 100 g, evenly spray 50 kg water.
Note: The heavier plots of rape locust and slug can be treated with 25% pymetrozine wettable powder 20 grams per mu.
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