Abstract
Plant diseases caused by sclerotial fungi are widespread and cause considerable losses to crop plants. The sclerotial propagules of disease causing pathogens are difficult to eliminate because they are well adapted to survive under adverse environmental conditions. Sclerotia are complex vegetative structures formed by the aggregation of hyphae in some filamentous fungi. Biological control has been defined by Garrett as “any condition under which, or practice whereby, survival or activity of a pathogen is reduced through the agency of any other living organisms except man with the result that there is reduction in the incidence of disease caused by the pathogen”. Phymatotrichum omnivorum Duggar is a serious pathogen of more than 2000 species of dicotyledonous plants and is reported on any monocotyledonous plant. Phymatotrichum root rot, also known as Texas root rot or Ozonium root rot, is one of the most destructive diseases of plants like cotton, alfalfa, etc., grown in soils which are alkaline and have high summer temperatures.
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