据全省各地有关部门调查,今年苹果树腐烂病普遍发生,是近几年来最重的一年,辽南、鞍山果区尤为严重,锦州、朝阳等地也普遍重于往年.据统计,全省腐烂病平均发病株率为62.35%,平均每株病疤数为3.53块.有的县、区腐烂病株率达89.3%,平均每株病疤数为8.5块,有的果园发病株率达100%.造成苹果树腐烂严重发生的主要原因是: According to a survey conducted by relevant departments across the province, apple tree rot disease is widespread this year and is the heaviest year in recent years. The areas of Liaonan and Anshan are particularly serious, with areas such as Jinzhou and Chaoyang generally heavier than in previous years. According to statistics, The average incidence rate of provincial rot disease was 62.35%, the average number of disease per plant was 3.53. In some counties and districts, the rate of rotted plants was 89.3% and the average number of disease per plant was 8.5, Up to 100%. The main reason for the serious occurrence of apple tree decay is: