apple valsa canker

基本解釋

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.
采用平板和離體培養(yǎng)法測定S-921菌株及其發(fā)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.
矯治試驗(yàn)結(jié)果表明，春季增施鉀肥，可提高樹皮含鉀量并減輕腐爛病發(fā)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(yán)重發(fā)生，已經(jīng)對陜西蘋果產(chǎn)業(yè)的順利發(fā)展構(gòu)成了嚴(yán)重的威脅。