黑龙江省克山县克山农场地处黑龙江省西北部，甜菜为农场第四大作物，IWe年纸简育苗移栽面积达6万亩，由于忽视甜菜叶部病害的预防，致使甜菜揭斑病大流行，田间发病率达到100％，流行强度4级，亩减产1吨。一、发病特点甜菜揭斑病属气流传播为主的多循环病害，多发生在老龄叶片 Keshan County, Heilongjiang Province Keshan Farm is located in the northwestern Heilongjiang Province, the fourth largest crop farm beetroot, IWe annual paper planted seedlings transplanted area of ​​6 hectares, due to ignore the prevention of beet leaf disease, resulting in sugar beet disease Pandemic, field incidence rate of 100%, the popular intensity of 4, 1 ton mu reduction. First, the incidence characteristics Beet disease is a multi-cycle airborne diseases, mostly in the aged leaves