According to Gorlach et al. (1996), the induction ofSAR in wheat plants against powdery mildew(Blumeria (Erysiphe) graminis f.sp. tritici) by BTHtreatment is accompanied by the induction of a wellcharacterised set of genes (SAR genes). Moreover,Schweizer et al. (1999) reported that rice seedlingstreated with BTH acquired resistance to subsequentattack by the rice blast fungus, Magnaporthe grisea.