中文摘要：

确定马铃薯窖储主要真菌病害马铃薯干腐病的致病茵株，为科学防治提供依据。从黑龙江省哈尔滨地区具有典型马铃薯干腐病症状的薯块中分离获得了2个镰刀茵菌株，通过生物学特征、致病性测定和ITS序列分析进行鉴定。根据测定茵株的生长速度、茵丝形状、茵落色泽、基物表面色泽等初步确定2个致病茵株为黄色镰刀茵（F．culmorum）和燕麦镰刀茵（F．avenaceum），两菌株对离体块茎的致病率分别为41．05％和72．20％。2。个菌株的ITS序列与GeneBank中的黄色镰刀菌和燕麦镰刀茵的完全一致，相似度均达到100％，也验证了依据传统特征的鉴定结果。明确了黄色镰刀菌为我国马铃薯干腐病的致病菌。

英文摘要：

Determining the pathogenic strain of dry rot during potato storage period is of great significance for sci- entific defending and controlling. In this experiment, we isolated two Fusarium strains with pathogenicity from Har- bin, Heilongjiang province and identified by biological characteristics, pathogenicity and ITS sequencing analysis. According to the growth rate of strain, mycelium shape, colony color, and substrate surface color etc ,two pathogenic strains were preliminary identified as Fusarium culmorum and Fusarium avenaceum, and their pathogenicity rate were 41.05% and 72.20%, respectively. The rDNA-ITS fragments of two pathogenic strains were completely con- sistent with Fusarium cubnorum and Fusarium avenaceum in GeneBank. Combined with the results of morphological identification,we determined two Fusarium strains for potato dry rot pathogen in Heilongjiang province.