Some production factors and characteristics of H(?)lminthosporiumturcicum pathotoxin(Ht-toxin)were studied.The experimental results showedthat the most suitable cultural condition for Ht-toxin production was understatic and dark liquid culturing at 25~28℃ for 20 days.Among differentsolid cereal media,the crushed maize granule was the best one(1.653g crudepurified Ht-toxin/100g maize granules),Sorghum and rice kernel were thenext.Ht-toxin was a heat-stable but light-unstable pathotoxin.Its toxicactivity did ...