Abstract: The effect of spore germ ination and pathogenecity of 4 parasitic fungi by 3 solvents and temperature was investigated.The spore germination was enhanced by 2% sucrose for Alternatia tenuis and by 0.1% Tuwen-80 for Pestalotiopsis guepinii .While there was no significant difference of spore germination by 2% sucrose,0.1% Tuwen-80 and disinfected water for Fusarium semitectum. The temperature had a significant effect on the fungal pathogenecity. High tem perature resulted in high pathogenecity. The temperature for infection dodders in vitro was lower for F .semitectum and A.tenuis than thatfor P.guepinii.