苹果树多年生锯口腐烂病发生情况及原因

Occurrence and Reason of Valsa mali Miyabe et Yamada in Perennial Apple Kerf

苹果树腐烂病在黑龙江各地发生越来越严重。据调查,2012年春东宁县7家果园的盛果期苹果树腐烂病病株率达到90%以上,其中多年生锯口发生腐烂病率很高。锯口是苹果树腐烂病发生的主要部位,锯口越多腐烂病发生越严重,锯口越大愈合时间越长,腐烂病发生机率就越高。所以在苹果树修剪中,不宜留下太大和过多的锯口,并对较大的锯口每年应采取合理的保护措施。

Valsa mali Miyabe et Yamada occurs more and more serious all over Heilongjiang province. According to the survey,in the spring of 2012,diseased rate of rot was above 90% in seven apple orchards in Dongning,and the perennial kerr rot occurrence rate was very high. Kerr was the major part of the apple tree canker occurred, the more kerf rot disease occurred,the greater the kerr healing time and the decay rot disease occurrence probability was higher. So in the tree pruning,too big and too many kerr was not reasonable,and reasonable protective measures should be taken year after year if it had larger kerr.