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2011年春,通过对河北省张家口市3个苹果园237株苹果树1 691个苹果树腐烂病病斑调查发现,病斑大小与数量呈负相关;以单个调查单元计算,不同部位病斑总数从高至低为:中心干>主干>主枝>干与基部三主枝交叉处>其他交叉处>侧枝>其他部位,有枝干越粗病斑越多的趋势,主干、中心干、主枝、干与基部三主枝交叉处等关键部位病斑数占总病斑数的74.09%;不同方位病斑数排序为:西南>东南>正南>东北>西北>正西>正北>正东>四周,南面、东南面和西南面病斑数约占总病斑数的60%;不同高度病斑数排序为:1 m以下>1～2 m>2 m以上,2 m以下病斑数占总病斑数的96.63%,有高度越低病斑越多的趋势。随着病情加重,特大型和大型病斑、主枝部位病斑、“四周”型病斑、东南和东北方位病斑数量均有增加的趋势。
In the spring of 2011, a total of 1 691 apple tree rot disease spots from 237 apple tree orchards in 3 apple orchards of Zhangjiakou City, Hebei Province were investigated. The results showed that there was a negative correlation between the lesion size and the number of diseased apple trees. From a single investigation unit, High to low as: Center dry> trunk> main branch> dry and base three main branches of the intersection> other intersections> side branches> other parts, there are branches of the more coarse spot more trends, the trunk, the center dry, the main branch , Stems and basal three main branches of the intersection and other key spots in the total number of lesions accounted for 74.09% of the total number of spots; different orientations of lesions were: Southwest> Southeast> Zhengnan> Northeast> Northwest> Zhengxi> Zhengbei> Zhengzheng East> four weeks, south, southeast and southwest of the total number of lesions accounted for about 60% of the total number of lesions; different height lesions were: 1 m below> 1 ~ 2 m> 2 m above the 2 m lesions The number accounted for 96.63% of the total number of spots, the lesser the height of lesion more trend. With the aggravation of the disease, extra large and large lesions, the main branch of the lesion, “four weeks” type lesions, southeast and northeast directions lesions have increased the number of lesions.