PJB-2015-355
LEAF BLIGHT OF CATHARANTHUS ROSEUS (L). G. DON CAUSED BY MACROPHOMINA PHASEOLINA (TASSI) GOID AND ITS IN VITRO CONTROL THROUGH BIO-PESTICIDES
M.A.U. MRIDHA AND M. M. RAHMAN
Abstract
Catharanthus roseus (L.).G. Don, a highly valued medicinal plant suffers from a serious disease. A survey on the symptom and severity of the leaf blight of C. roseus was performed in the nurseries of the Institute of Forestry and Environmental Sciences (IFESCU), Bangladesh Council of Industrial Research (BCSIR) and Bangladesh Forest Research Institute (BFRI), Bangladesh. An observation was also made in the avenues and garden of King Saud University (KSU), Kingdom of Saudi Arabia. No disease was recorded in KSU, but severe infections were found in all the locations surveyed in Bangladesh. The highest infection percentage and the highest disease index were found in BCSIR nursery followed by BFRI and the lowest was recorded in IFESCU nursery. Macrophomina phaseolina (Tassi) Goid was isolated and it was proved to be pathogenic. This is the first report of leaf blight of C. roseus caused by M. phaseolina. Azadirachta indica, Ocimum sanctum Vitex negundo, Mucuna pruriens, Calotropis procera, Terminalia arjuna, Allium sativum, Zingiber officinalis and Allium cepa were used as biopesticides. Out of the nine plant species screened, T. arjuna showed the highest (58.37%) inhibition percentage which was followed by A. indica (55.72%) and the lowest (27.4%) inhibition percentage were obtained with V. negundo whereas the rest of the plant extracts showed more or less same inhibitory effect.
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