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葡萄穗轴褐枯病是交链孢菌(Altern ariaviticotaBrun)所致。葡萄感病后,病株果穗逐渐萎缩干枯,常被误认为房枯病。巨峰感病最重,玫瑰香抗病。据在唐山新区东马庄葡萄园调查,巨峰果穗发病率最高达31.7％,减产25％～30％。 一、特征和病症状 发病初期,穗轴分枝上出现水浸状斑,迅速扩展,最后穗轴变褐坏死,果粒变褐随之萎蔫脱落;严重时由局部穗轴延至整个果穗干枯脱落。
Grape Cotyledon rot disease is caused by Alternaria alternata (Brun). After the grapes are infected, the ear of the diseased plant gradually shrinks and dries, and is often mistaken for the room blight. Jufeng the heaviest, rose incense disease. According to the investigation of Dongma Zhuang vineyard in Tangshan New District, the peak incidence of fruit ear in Kyoho reached 31.7% and the yield was reduced by 25% -30%. First, the characteristics and symptoms Early onset, burgeon-like spots appeared on the rachis branches, rapidly expanding, the last cob browning necrosis, browning browning along with wilt off; severe comatose from the local extension to the whole ear dry off .