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Pakistan Journal of Biological Sciences
  Year: 2010 | Volume: 13 | Issue: 21 | Page No.: 1023-1029
DOI: 10.3923/pjbs.2010.1023.1029
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Antifungal Activity of Some Plant Extracts on Alternaria alternata, the Causal Agent of Alternaria Leaf Spot of Potato

M. Zaker and H. Mosallanejad

Pure methanol (m) and methanol water (mw) extracts of 5 plants namely: peppermint, eucalyptus, lavandula, Russian knapweed and datura were screened for their antifungal ability against Alternaria alternata, the causal agent of Alternaria leaf spot of potato at 5, 10 and 15% concentrations in vitro. Fungicide mancozeb 0.2% was also used for better comparison. Poisoned food technique and spore germination assay method were used to evaluate the antifungal efficacy of plant extracts. Present findings showed that methanol extracts of eucalyptus, peppermint and lavandula had impressive antifungal effects in inhibiting the mycelial growth as well as spore germination of the pathogen. It was also found that methanol extracts were quite more effective than methanol water extracts in this regard. Methanol extracts of peppermint (15%), lavandula (15%), peppermint (10%) and eucalyptus (15%) demonstrated promising ability in inhibiting the mycelial growth of A. alternata by 0.13, 0.40, 0.43 and 0.50 cm, mycelial growth respectively, while majority of methanol water extracts had either less or no effects in this connection. Spore germination of A. alternata was prominently reduced by methanol extracts, while those of methanol water extracts had very less effects in this regard. Mancozeb (0.2%), methanol extracts of eucalyptus (15%) and peppermint (10%) by 2, 6 and 7% spore germination were best, while methanol water extracts of datura 10, 15 and 5%, lavandula 15 and 10% and also Russian knapweed 5% represented no effect and by 91, 89, 87, 87, 85 and 85% spore germination were at par with control. Findings from this study confirmed that plant extracts can be used as less hazardous natural fungicides in controlling plant pathogenic fungi, thus reducing the dependence on the synthetic fungicides. Methanol extracts of peppermint, eucalyptus and lavandula might be promising materials for natural formulations in controlling Alternaria leaf spot of potato in the field.
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  •    Field Application of Chitosan and Moringa oleifera Extracts as Fungicides Alternatives to Control Early Blight and Improvement Growth and Yield Quality of Potato
  •    Evaluation of Food Preservatives, Low Toxicity Chemicals, Liquid Fractions of Plant Extracts and their Combinations as Alternative Options for Controlling Citrus Post-harvest Green and Blue Moulds in vitro
  •    Biochemical Evidences of Defence Response in Tomato against Fusarium Wilt Induced by Plant Extracts
  •    Effect of Ocimum gratissimum (L.) and Aframomum melegueta (K. Schum.) Extracts on the Growth of Sclerotium rolfsii (Sacc.)
  •    Control of Wheat Rust by Leaves Extract of Poisonous Phanergamic Plants
  •    Phytofungitoxic Properties in the Aqueous Extracts of Some Plants
How to cite this article:

M. Zaker and H. Mosallanejad, 2010. Antifungal Activity of Some Plant Extracts on Alternaria alternata, the Causal Agent of Alternaria Leaf Spot of Potato. Pakistan Journal of Biological Sciences, 13: 1023-1029.

DOI: 10.3923/pjbs.2010.1023.1029


05 January, 2019
syed ghayas ali:
very good research work.




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