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Growth, Morphological Alterations and Adaptation of Some Plant Pathogenic Fungi to Benlate and Zineb. A New Look

Amany H. Abo Ellil and Eiman F. Sharaf

The fungicides benlate and zineb were tested in vitro on growth, sporulation and morphological alterations of Alternaria solani, Fusarium oxysporum and Sclerotium cepivorum. Reduction in growth criteria of the tested pathogenic fungi was more correlated with elevation of benlate dose than with zineb. The target fungi showed a limited resistance to zineb training transfers, but could tolerate up to 5- folds of sublethal benlate dose specially Sclerotium cepivorum. The pigmentation and the dark colour of colonies are the most morphological alterations occurring in the growth media, in response to toxic stress of both fungicides. Fifty and about 100% sectoring were incident just before LD50 and lethal dose respectively of both chemicals. Percentage increase of sectoring was associated with progressive reduction in sporulation. Tolerance of these fungi towards zineb, is correlated with increased ability to synthesize extracellular melanin under fungicidal stress. A new look to the mode of action of each fungicide was discussed in the light of current oxygen toxicology theory.

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  How to cite this article:

Amany H. Abo Ellil and Eiman F. Sharaf , 2003. Growth, Morphological Alterations and Adaptation of Some Plant Pathogenic Fungi to Benlate and Zineb. A New Look. Journal of Biological Sciences, 3: 271-281.

DOI: 10.3923/jbs.2003.271.281


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