亚磷酸二氢钾对生姜茎基腐病菌腐霉的抑制作用

Inhibitory Effect of Potassium Dihydrogen Phosphate on Pythium Causing Ginger Rhizome Rots

由腐霉菌(Pythium myriotylum)引起的生姜茎基腐病是目前危害生姜生产的主要病害,为实现生姜茎基腐病的绿色防治,通过亚磷酸二氢钾的室内毒力测定,观察亚磷酸二氢钾对生姜茎基腐病原菌的抑制作用;采用菌丝生长速率法,测定亚磷酸二氢钾对生姜茎基腐病原菌腐霉以及立枯丝核菌等7种病原菌的抑菌效果。结果表明:亚磷酸二氢钾对小麦纹枯病菌、立枯丝核菌、白菜叶斑病菌、生姜茎基腐病原菌菌丝生长抑制效果较显著,其中亚磷酸二氢钾对生姜茎基腐病原菌菌丝生长抑制效果最好,其次是白菜叶斑病菌,4g·L^(-1)时抑菌率达84.4%,EC_(50)=0.632 6g·L^(-1)。

Ginger rhizonme rot caused by Pythium myriotylumis the main disease that influence the production of ginger.In order to achieve green control of ginger rhizome stem,the inhibition effect of potassium dihydrogen phosphite on Pythium myriotylum was observed by the indoor toxicity using the mycelial growth rate method.The bacteriostatic effect of 7 pathogenic fungi such as Pythium myriotylum and Rhizoctonia solani,etc were also tested.The results showed that the inhibitory effect of potassium subhydrogen phosphate on the mycelium growth of Rhizoctonia zeae,Rhizoctonia solani,Alternaria alternata and ginger rhizome rot was significant.The inhibitory effect of ginger rhizome rot was the best,followed by Alternaria alternata,and the inhibition efficiency was 84.4%in 4 g·L^-1,and the EC_（50） was 0.632 6 g·L^-1.