Study On Effect Factors And Chemical Control Of Ternaria Alternata And Wildfire Disease On Tobacco In Mudanjiang

Tobacco with higher economic benefits is one of Chinese important economic crops.Although tobacco can give the country and enterprises to bring more objective economic benefits,but often can not achieve the expected benefits of tobacco,the most important reason is that tobacco-prone disease,which will seriously reduce the direct result of reduced cigarette production,quality not tall.Therefore,it is very important to clarify the occurrence of tobacco diseases and to reduce the loss of disease prevention and control.The author in 2012-2015 survey of tobacco disease kinds of Mudanjiang major tobacco production line,distribution and extent of the disease,in recent years aimed at understanding Mudanjiang tobacco disease situation.Results showed that:1.There are 10 main tobacco diseases(5 fungal diseases,2 bacterial diseases,2 viral diseases and 1 non-infectious disease)in the main tobacco producing areas of Mudanjiang,Heilongjiang Province.Among them,common mosaic disease,The brown spot disease and the wildfire disease are common and harmful tobacco diseases in Mudanjiang tobacco area.2.Among the factors influencing the occurrence of tobacco brown spot and wildfire disease,the first is that the temperature of Mudanjiang was 23.7-28.5 ? in 6-8 months,and the relative humidity was higher than 68.1%.The second is that soil and tobacco Seed with a tobacco wildfire disease and brown spot of the bacteria source,and the bacteria in the ground with winter survival ability;Third,in the cultivation techniques to prevent tobacco brown spot and wildfire disease occurrence,Mudanjiang tobacco sowing period is best arranged in 3 Between March 15 and March 20;In addition,excessive use of nitrogen fertilizer is likely to cause wildfire disease and outbreaks of brown spot disease.3.The results showed that the control effect of the gram of Kang diluted 500 times and the bacteria to kill diluted 500 times was good,it's Average control effect beyond 75%,40%sclerotium,25%prochloraz,25.5%C The control effect of 80%chlorothalonil(10 mg/L)was better than that of 80%chlorothalonil.The average control effect was over 74%.