近年来甜菜根腐病在我地普遍发生,一般发病率5％左右,重达50％,成为甜菜生产上的重要病害之一。1990年8月针对根腐病的发生为害做了系统的调查,现将结果介绍如下: 一、为害状及程度甜菜受害后一般使块根组织腐烂、下陷、变褐、最后病块根呈干腐状,病根内部形成空腔或乱麻状。严重时块根溃烂,叶片随之凋萎枯死。为害状因侵染的病原菌不同而各异,但一般发病率接近 In recent years, beet root rot occurred in my place, the general incidence of about 5%, weighing 50%, become beet production one of the important diseases. August 1990 for the root rot disease done a systematic investigation, the results are as follows: First, the degree of damage and the degree of sugar beet after the general damage to root tuber tissue, subsidence, browning, the final root tubercle was dry rot , The root causes the formation of internal cavity or messy. In severe cases, the tuberous ulcer leaves wither and wither. Harm due to infection of different pathogens vary, but the general incidence rate close