It is discussed the occurrence and harmfulness of valsa sordida of poplar in 4 aspects.
从4个方面论述了杨树烂皮病的发生规律及危害性。
2
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.
采用平板和离体培养法测定S-921菌株及其发酵液对苹果树腐烂病菌的作用。
3
It was revealed in an extensive survey that the occurrence of apple Valsa canker (Valsa ceratosperma) is correlated negatively with potassium content in bark.