江苏淮河以南地区,雨水多、湿度大,十分利于梨黑星病的发生。近年来,本区在梨黑星病的防治上,作了不少试验,在一定场合下起到了积极作用。但仍有部分地区反应防治效果不稳定,这不仅表现在不同年份由于气候条件的变化所带来的差异,即使气候条件基本相似,防治措施基本一致的不同年份,差异也很大。 South of Huaihe River in Jiangsu Province, rain and humidity, is very conducive to the occurrence of pear scab. In recent years, many tests have been made on the prevention and treatment of pear scab in this area, which has played a positive role under certain circumstances. However, there are still some areas where the response to pest control is unstable. This is not only reflected in the differences brought by climate change in different years, but also in different years with basically similar climatic conditions and similar control measures.