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 testedin vitroBavistin of three doses (100, 200 and 300 ppm) and Tilt 250 EC (100 and 200 ppm) were most effective in inhibiting radial growth of Pestalotiapalmarum. Among the seven indigenous plant extracts tested in vitro, two doses (4 and 5%) ofgarlic (Allium sativum) extractswere found most effective in inhibiting the radial growth of the fungus.
M.R. Islam , M.K. Hossain , M.H. Bahar and M.R. Ali , 2004. Identification of the Causal Agent of Leaf Spot of Betelnut and in vitro
Evaluation of Fungicides and Plant Extracts Against it. Pakistan Journal of Biological Sciences, 7: 1758-1761.