油菜菌核病是油菜上三大病害之一，近年来发生严重，轻者造成油菜减产２０％～３０％，重者高达５０％以上，严重影响油菜产量和菜籽的含油量。对油菜菌核病的发生规律及防治技术的研究，国内已有报道［１，２，３］，而对其防治适期研究尚少，且防治适期描述比较模糊。为... Sclerotinia sclerotiorum is one of the three major diseases in rapeseed. In recent years, it has become serious. Light rape causes 20% -30% of rapeseed production and more than 50% of heavy rapeseed, which seriously affects rapeseed yield and rapeseed oil content. The occurrence of rape Sclerotinia and prevention and control of the law, has been reported in China [1,2,3], and its research on the appropriate period of control is still less, and the description of the appropriate period of control is vague. for...