Abstract
Bulk density, soil moisture content, and soil porosity were studied to determine their effects on the survival of sclerotia ofMacrophomina phaseolina in the Ap horizon of a Mexico silt loam. A gravimetric moisture content of w=0.15 supported sclerotial numbers whereas higher (w=0.25) and lower (w=0.05) moisture levels did not. Sclerotial germination was maintained only at w=0.15. High bulk density Db=1.56 did not support fungal sclerotial numbers as well as Db=1.30 or 1.15. Survival was poorest when Db=1.56 and w=0.25 were combined.
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