大黃葉黑粉病系甘肅省禮縣大黃上的一種新病害。該病發(fā)生后在葉片背面沿脈形成網(wǎng)紋狀腫大，最初紅色-紫紅色，后變?yōu)榧t褐色。葉片正面呈淡黃色網(wǎng)紋。葉柄上形成瘤狀泡斑，排列成行。病株生長(zhǎng)停滯，矮化，葉片變小，有的提早枯死。經(jīng)鑒定病原為什瓦茨曼楔孢黑粉菌Th－ecaphoraschwarzmanina屬國(guó)內(nèi)新記錄種。今對(duì)發(fā)生為害情況、毒狀特點(diǎn)及病原形態(tài)進(jìn)行詳細(xì)描述。并提出防治建議。

A new disease of Rhubarb occured in Gansu Province of China was reported ,T he disease appears along the veins of lower leaf surface of Rhuaarb(Rheum pnlmatum)with swelling， and shows a reddish-purple color at the beginning and turns pale brown late,On the leaf appears yellowish reticulated spots，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二as identified as a smut Thecap/,ora se/,u}orzmcniona and seems to be the first reported case that occurs in China,Methods for its control are suggested.