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Peanut scab was rampant at the large scale of peanut planting areas in northern of China,resulting in 10% ~30% losses in the general fields and up to over 50% losses in the severe disease fields, which was becoming a problem that should be solved quickly with the being spread rapidly.The relevant research on disease epidemiology was comparatively scarce at home and abroad, which posed a huge difficulty for the forecasting and control of peanut scab.To clear the harm degree of peanut scab at different Producing areas in Liaoning province, the disease damage and epidemic dynamics were studied.The model had been established which can be used to derivate the epidemic periods of peanut scab and it can provide scientific basis for prevention and treatment of diseases in the field.The different varieties of peanut scab in Liaoning province was investigated by the method of five investigation sites.