PJB-1974-20
BIOLOGICAL CONTROL OF SCLEROTIUM ORYZAE CATT., THE CAUSE OF STEM TOOR OF RICE IS POPULATION AND VIABILITY OF SCLEROTIA IN SOIL
S.M.
HAROON USMANI AND ABDUL GHAFFAR
Abstract
A floatation technique was developed for the
recovery and enumeration of sclerotia of Sclerothum oryzae from soil. During a study of the population of sclerotia od S. oryzae in soil
of rice-wheat-rice or rice-fallow-rice rotations a
greater number of sclerotia were observed in soil under wheat as compared to rice or fallow fields . More sclerotia were found on the soil surface with gradual in numbers at 6’’ and
9’’depths. Viability of sclerotia on rice stubbles and in rice fields was much higher than the sclerotia isolated from the soil under wheat crop or fallow field. Decreased viability of sclerotia at greater depths was related to a predominant colonization of sclerotia by bacteria.
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