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Pakistan Journal of Biological Sciences
Year: 2004  |  Volume: 7  |  Issue: 10  |  Page No.: 1758 - 1761

Identification of the Causal Agent of Leaf Spot of Betelnut and in vitro Evaluation of Fungicides and Plant Extracts Against it

M.R. Islam, M.K. Hossain, M.H. Bahar and M.R. Ali    

Abstract: Naturally infected leaf samples of betelnut having characteristic symptoms of spots were collected from the campus of Khulna University, Bangladesh. The pathogen of this disease was identified on the basis of growth characters, acervuli production and conidial features on PDA medium as Pestalotia palmarum. The species was found pathogenic on excised leaves of the betelnut. Among the six fungicides tested in vitro Bavistin of three doses (100, 200 and 300 ppm) and Tilt 250 EC (100 and 200 ppm) were most effective in inhibiting radial growth of Pestalotia palmarum. Among the seven indigenous plant extracts tested in vitro, two doses (4 and 5%) of garlic (Allium sativum) extracts were found most effective in inhibiting the radial growth of the fungus.

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