Screening,Identification and Control Effect of Antagonistic Strain Bs2 on Hot Pepper Powdery Mildew

69 strains antagonistic against Fusarium oxysporum,Botrytis cinerea,Colletotrichum gloeosporioides,Cylindrocarpon,were screened from the 40 field soil samples.A strain Bs2 with 50-fold dilution(5.6×107cfu/mL) of the fermentation broth gave good control efficacy of 60.77 % against hot pepper powdery mildew in the field test after 3 sprays,which was lower than that of fungicide triadimefon(0.8 g/L).Bs2 was identified as Bacillus pumilus on the basis of its morphological,physiological and biochemical characters as well as its sequence analysis of 16S rDNA with 99.41 % similarity to B.pumilus SBT2-9.