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THE EFFECT OF ASSOCIATED SOIL MICROFLORA ON FUSARIUM UDUM BUTL., THE FUNGUS CAUSING WILT OF PIGEON‐PEA (CAJANUS CAJAN (L.) MILLSP.)
Author(s) -
VASUDEVA R. S.,
ROY T. C.
Publication year - 1950
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1950.tb01037.x
Subject(s) - biology , cajanus , inoculation , fungus , bacillus subtilis , fusarium , fusarium wilt , horticulture , aspergillus , fusarium oxysporum , botany , agronomy , bacteria , genetics
Inoculation with Fusarium udum Butl. produced more wilt of pigeon‐pea in sterilized than in unsterilized soils at the same pH. From unsterilized soils with low disease incidence, nine fungi, Bacillus subtilis and an Actinomyces were isolated. The number of isolations of a particular organism varied from month to month during the cropping season of pigeon‐pea in Delhi. Interaction of Fusarium udum and other organisms isolated was studied. Aspergillus niger and A. terreus secreted inhibitory substances in potato‐dextrose broth: Bacillus subtilis inhibited growth on solid medium and also produced a toxic substance in potato‐dextrose broth. The nature of the medium employed and period of growth were important factors in the production of the inhibitory principle, which is thermostable. The low incidence of pigeon‐pea wilt in unsterilized soils may result from the inhibitory activity of the associated microflora in the soil.