ビワ紋羽病の生態的研究(第1報)

腐植とビワ紋羽病の発病について

抄録

This paper gives a knowledge on the relationship between the humus contents of soil and the occurence of white root rot (caused by Rosellinia necatrix Prill) in 26 loquat orchards at Mogi, Nagasaki Prefecture.
In this study, the authers found a positive correlation between the amount of humus in orchard soil and the percentage of infested trees by white root rot (see Fig. 2 and Fig. 3).
It seems that the contents of humic acid in soil humus have a positive correlation with the percentage of infested trees in the orchard (see Fig.4).