Antibiosis of Xenorhabdus nematophilus Metabolites Against Phytophthora infestans

The antibiosis of metabolites from Xenorhabdus nematophilus against Phytophthora infestans was studied by using inhibitory test on plate The growth rate was inhibited 70% at concentration of 1 5-3ml/L of the fermentation filtrate, and 90%-100% at 6-50ml/L The hyphae was inhibited in growth but not destroyed completely at 12-50ml/L of the fermentation filtrate 50ml/L fermentation filtrate also resulted in 50% inhibition of sporangia germination of the fungus The metabolites permeated through potato tuber tissue for up to 3cm in depth within 24h, and thus could be used for the control of potato late blight by soaking potato tuber in the fermentation liquid