论文部分内容阅读
河北怀来苹果栽培面积0.8万hm2,是全国经济林百强县之一。近年由于种种原因,苹果腐烂病发生较为严重,已成为制约苹果产业发展的头号病害,发病严重的果园,树干上病疤累累,枝干残缺不全,甚至整株枯死。经调查,怀来县内苹果树腐烂病病株(发生及曾发生)占35%。为寻找该病发生的各种诱发因子,我们深入田间地头,进行了为期2年的调查走访,基本摸清
Hebei Huailai apple cultivation area of 8000 hm2, is one of the top 100 counties of economic forest. In recent years due to various reasons, apple rot disease more serious, has become the number one disease restricting the development of the apple industry, the serious disease of the orchard, the trunk scarring, branches incomplete, and even the entire dead. After investigation, Huailai County apple tree rot disease (occurred and occurred) accounted for 35%. In order to find out the various evoked factors that occurred in this disease, we went deep into the field and conducted a 2-year survey to visit and basically found out