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Jute is the most important cash crop of Bangladesh. It is obtained mainly from Corchorus capsularis L. and C. olitorius L. The contribution of jute sector to economy of Bangladesh is enormous. But diseases play a major role for the severe yield loss of jute. According to Ahmed(1) 24.5% loss in yield of fiber occurred owing to different diseases. Among the destructive diseases of jute, anthracnose and soft rot have significant impact on the yield of the crop. Anthracnose affected plants yield for poor quality fiber, mostly knotty in nature with adherent barks which resists the retting. Various workers in different countries evaluated the efficacy of various fungicides against Colletotrichum spp. and S. rolfsii under laboratory and field conditions(2-9). Very few works have been done for the control of anthracnose and soft rot diseases of jute by fungicides and plant extracts. Therefore, the present investigation was ascertained to investigate the inhibitory effect of extracts of various plant species and fungitoxicity of fungicides on the mycelial growth of C. gloeosporioides and S. rolfsii under in vitro conditions. Jute plants with anthracnose and soft rot symptoms were collected from selected fields of Manikganj (BJRI) and research field of the Botanical Garden, Dhaka University to record the prevalence of diseases during May, 2014 to November, 2014. Jute samples were collected in separate sterile polyethylene bags, labeled properly and then brought to the laboratory for isolating associated pathogenic fungi following "Tissue planting method" on PDA medium. Five fungicides, viz., Bavistin DF, Capvit 50 WP, Dithane M-45, Greengel 72 WP and Tilt 250 EC were collected from the Krishi Upokoron Biponi Kendro, Khamarbari, Farmgate, Dhaka. The fungicides which were effective at 500 ppm for controlling the test pathogens were further tested at 100, 200 and 400 ppm following poisoned food technique(10).

the dhaka university journal of biological sciences

In vitro efficacy of fungicides and plant extracts on the growth of Colletotrichum gloeosporioides (Penz.) Penz. &amp; Sacc. and Sclerotium rolfsii Sacc. the causal organisms of anthracnose and soft rot of jute