トマト根腐病に対するポット条件下における亜リン酸肥料およびピカルブトラゾクス水和剤の発病抑制効果

抄録

Effects of phosphite fertilizers and picarbutrazoxon on tomato root rot caused by Pythium cryptoirregulare Garzón, Yánez & G. W. Moorman and P. recalcitrans Belbahri & E. Moralejo were tested under pot condition. Soil drench of the phosphite liquid fertilizer at 100–1,000 ppm concentrations and picarbutrazox wettable powder at 500-fold dilution showed suppressive effects on root rot. However, the number of chemically damaged plants increased with increasing concentration and frequency of application of the phosphite liquid fertilizer, indicating that phosphite liquid fertilizer at a concentration of 100 ppm was considered suitable for the control of tomato root rot.