apple valsa canker

基本解释

The effects of S-921 strain (Streptomyces aureus) and its fermented broth on apple tree canker, Valsa mali, were tested by plating and free culture methods.
採用平板和離躰培養法測定S-921菌株及其發酵液對蘋果樹腐爛病菌的作用。
It was revealed in an extensive survey that the occurrence of apple Valsa canker (Valsa ceratosperma) is correlated negatively with potassium content in bark.
矯治試騐結果表明，春季增施鉀肥，可提高樹皮含鉀量竝減輕腐爛病發生程度。
But recently, the apple tree valsa canker caused by Cytospora spp occurred seriously and prevalently, which had became a threaten that held back the apple industry development.
然而，近年來蘋果樹腐爛病的普遍嚴重發生，已經對陝西蘋果産業的順利發展搆成了嚴重的威脇。