油菜菌核病发生规律及防治技术研究简报

本地属长江中下游冬油菜区，常年油菜菌核病发生危害重，2001～2002年对其发生消长规律系统观测，结果表明：3月初叶片始病，当气温回升到15℃，相对湿度达80%以上时，病情激增快；5月上旬末茎病株率激增，中旬末达到高峰。花期雨水多，气温高是该病重发的主导因素，品种、播种期、密度、长势、开花期对其发生也有一定影响。防治上，在农业防治基础上，坚持化学防治，实行花期全程药控，可有效地控制油菜菌核病的发生危害。

Brief Report on Occurrence Regularity and Control Technique Research ofSlerotinia Sclerotiorum (Lib) de Bary on Rape

This region belongs to the winter rape zone in the Yangtze River Middle and Lower Reaches.Every year , a serious Sclerotinia Sclerotiorum (Lib) de Bary on rape occurs. The observation over the regularity of the growth and decay system during the period (2001-2002) shows that leaves begin to fall ill in the early March. When the air temperature rises to 15℃ and relative humidity reaches over 80%, the condition rapidly deteriorates. At the end of the early May, the diseased stems quickly increase and come to the climax in the middle May. Plentiful rain and high air temperature in florescence are the leading factors of the serious disease occurrence. Species, sowing period, density ,growth and florescence bring a considerable influence on the occurrence. As for the prevention of the occurrence, on the basis of the ecological prevention, we can stick to the chemical prevention and carry on the pesticide control in the whole process of florescence so as to effectively control the damage caused by the Sclerotinia Sclerotiorum (Lib) de Bary on rape.