Cultural, morphological and pathological variation of Sclerotium rolfsii isolated from different crops
1994
dela Cueva, F.M. | Natural, M.P. (Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding)
Variation of Sclerotium rolfsii, the causal organism of stem rot, wilting and/or blight of a number of economically important crops was studied. The cultural, morphological and virulence pattern to different crop species of the different isolates of the organism was compared. Attempts to classify the isolates into strains on the basis of aversion or antagonism when paired in cultural media were also made. Differences in cultural and morphological characteristics of the different isolates of S. rolfsii were noted. Srt, an isolate from tomato produced the highest number of sclerotial bodies while SrM isolate produced the least. Very few but big sclerotial bodies were observed from pepper isolate (SrPP) while SrCp produced numerous but small sclerotial bodies. All the ten isolates were pathogenic to mungbean, soybean, cowpea, cotton, pepper, and tomato. Four days after inoculation, two isolates viz., SrCp and Srs caused wilting in peanut while isolates SrCt and SrA caused wilting in wheat. SrCp was considered as the most agressive and the most virulent isolates. It infected all the crop species except wheat four days after inoculation while wilting occurred 6 days after inoculation with the other isolates
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