Abstract
New selective medium was used for S. cepivorum growth, forming sclerotia and sclerotial germination. Other affecting condition were evaluated such as pH degree and microelements. Onion bulb-extract at 50% in Potato dextrose agar (OE50PDA) was the best medium for the growth of S. cepivorum gave significant heavy mycelial growth and large numbers of sclerotia. The best growth of the fungus occurred at pH 6.0. Magnesium (Mg), sulfur (S), manganese (Mn) increased the mycelial growth regularity in all concentrations and formed large numbers of sclerotia and achieved significantly sclerotial germination.