On Occurrence of Root Rot Disease of Actinidia chinensis and Its Control

It was showed by field investigation and control experiment that the root rot disease of Actinidia chinensis was more severe in orchards with old trees than those with young trees.It was found out that the disease occurred more seriously in orchards when the trees were over deeply planted, on heavy clay soils with poor drainage and poor gas permeability.It was proved that the disease could be effectively controlled by planting the tree rows on ridges instead of among the ridges.The disease could be also well controlled by pouring the roots with 800 x ' Dijunjing' chemical after the roots were aired, the controlling effect reached 67.7% in the experiment, and the control effect by ' Jiashuangling' chemical reached 64.2%.