大黄叶黑粉病研究初报

A Preliminary Study on Leaf Smut of Rhubarb

大黄叶黑粉病系甘肃省礼县大黄上的一种新病害。该病发生后在叶片背面沿脉形成网纹状肿大，最初红色-紫红色，后变为红褐色。叶片正面呈淡黄色网纹。叶柄上形成瘤状泡斑，排列成行。病株生长停滞，矮化，叶片变小，有的提早枯死。经鉴定病原为什瓦茨曼楔孢黑粉菌Th－ecaphoraschwarzmanina属国内新记录种。今对发生为害情况、毒状特点及病原形态进行详细描述。并提出防治建议。

A new disease of Rhubarb occured in Gansu Province of China was reported.The disease appears along the veins of lower leaf surface of Rhuaarb (Rheum palmatum) with swelling,and shows a reddish-purple color at the beginning and turns pale brown late. On the leaf appears yellowish reticulated sppts, in Petioles the spots are tumourlike blisters arranged in rows.The growth of the smaller and in severe attacks the whole plant eventually withered.The causal pathogen was identified as a smut Thecaphora schwarzmaniana and seems to be the first reported case that occurs in China.Methods for its control are suggested.