Abstract
Diallyldisulfide (DADS) and onion seedlings grown from bacterized seeds significantly enhanced the germination of Sclerotium cepivorum sclerotia in muck soil compared with germination in the absence of seedlings or in the presence of seedlings grown from surface-sterilized nonbacterized seeds. Germination was greater for sclerotia on the soil surface than for buried sclerotia. When used for seed bacterization, Bacillus subtilis strain B-2 and four other bacterial strains obtained from rhizospheres of field-grown onions differed in their abilities to enhance germination of sclerotia. Strains B-2, UI-2, and B caused significantly greater germination of sclerotia than did strains UI-1 and W. Sclerotia in soil containing onion seedlings bacterized with B-2, UI-2, and B significantly supported reduced general indigenous bacterial and fungal populations. Treatment of soil with DADS reduced general indigenous bacterial but not fungal populations associated with sclerotia. There were significant inverse correlations between the proportions of sclerotia germinating and populations of bacteria and fungi associated with sclerotia of S. cepivorum. Key words: onion white rot, sclerotia, seed bacterization, mycosphere microflora, germination.
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