Abstract
South African bituminous coal can be converted by controlled wet oxidation to a highly oxidized water-insoluble product (oxihumic acids) and water-soluble oxifulvic acids (OFA). OFA, OFA-Cu and OFA-Fe, including various complexes, were evaluated against four fungal ( Aspergillus flavus, Fusarium oxysporum, Colletotrichum dematium and Alternaria cassiae) and three bacterial ( Erwinia carotovora, Pseudomonas syringae and Clavlbacter michiganense pv. michiganense) plant pathogens. CuSO 4 and CuSO 4 & FeSO 4 significantfy reduced growth of Erwinia, Clavibacter and Pseudomonas when compared to the control. CuOCI significantly reduced growth of Erwinia and Clavibacter. OFA, OFA-Fe, FeSO 4 , OFA-Cu & OFA-Fe and OFA-Cu reduced the growth of Pseudomonas and with the exception of the latter two, Clavibacter. CuSO 4 inhibited the growth of Colletotrichum. Alternaria and Fusarium significantly. OFA-Cu & OFA-Fe reduced the growth of Colletotrichum when compared to the control whereas OFA-Cu reduced growth in Alternaria significantly.
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