近年青岛地区栽培的巨峰系葡萄幼穗期出现了一种新病害,其特征是幼穗轴发生腐烂。据调查,其发病率一般为26％左右,严重地块病穗率可达63％以上。此病有逐年加重趋势,对葡萄生产已构成严重威胁。为此,我们对该病的症状、病原菌等进行了研究。 1 症状 发病部位主要在葡萄幼穗轴,花期前后为该病的盛发期,最初在穗轴上出现烫伤状的浅褐色病斑,以后扩展到整个幼穗轴及各个小穗轴,主穗轴发病后腐烂枯死,染病小穗轴极易脱落。空气潮湿时,病部可见黑色霉状物。当葡萄长到豆粒大小时,一般不再受侵染为害。发病轻的果穗除部分小穗脱落 In recent years, cultivation of Qingdao Jufeng grape spike period of a new disease, characterized by young shaft rotten. According to the survey, the incidence rate is generally about 26%, severe mass disease panicle rate of up to 63%. The disease has increased year by year trend, grape production has posed a serious threat. To this end, we have studied the symptoms of the disease, pathogens and so on. 1 Symptoms Occurred mainly in the grape panicle axis, flowering period of the disease flourishing period, the first burns appeared on the cob of light brown lesions, later extended to the entire panicle axis and each rachilla axis, the main spike After the shaft rot decay, sick spike shaft easily fall off. When the air is humid, the disease can be seen black moldy things. When the grapes grow to size, they are generally no longer affected by the infection. In addition to the incidence of light ear spikelets off some