It was revealed in an extensive survey that the occurrence of appleValsacanker (Valsa ceratosperma) is correlated negatively with potassium content in bark.
矫治试验结果表明,春季增施钾肥,可提高树皮含钾量并减轻腐烂病发生程度。
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.