Abstract
Laboratory and greenhouse studies were carried out to determine the effects of various concentrations (0·0025%, 0·005%, 0·01%, 0·1%, and 1·0%) of formaldehyde solution on the development of the stem-rot fungus, Sclerotium rolfsii. Laboratory tests were carried out on potato dextrose agar (PDA) in which the fungus was cultured. Significant differences were found in the mycelial growth rate and the number of sclerotia produced by the fungus at various formaldehyde concentrations. The two highest concentrations (0·1% and 1·0%) totally inhibited the growth of the fungus. There was no significant difference in the effect of the lower concentrations (0·0025%, 0·005% and 0·01 %) on fungal growth; sclerotia were formed at these levels. Results of greenhouse tests were similar to those obtained from laboratory tests: there was no stem-rot disease symptom at the two highest concentrations of formaldehyde, and at the lower concentrations where symptoms were manifest, there was no difference in the pathogenicity of the fungus to cowpea seedlings.
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