Journal of Plant Disease Sciences
Year : 2009, Volume : 4, Issue : 1
First page : ( 95) Last page : ( 98)
Print ISSN : 0973-7456. Online ISSN : 0976-2388.

An Evaluation of Some Bio Agents and Plant Extracts Against Leaf Spot of Jatropha Caused by Cqlletotmrihum Gloeosporioides Penz.*

Watve Y.G., Diwakar M.P., Kadam J.J.

Department of Plant Pathology, Dr. B.S. Konkan Krishi Vidyapeeth, Dapoli, 415 712 Dist. Ratnagiri (M.S.) India.

Abstract

All the bio control agents used in vitro were effective antagonist of Colletotrichum gloeosporioides. Maximum per cent inhibition in colony diameter of the test fungus was achieved due to Trichoderma harzianum (83.33 %) followed by Trichoderma viride (77.78 %) and Bacillus subtilis (77.78 %) when the test fungus was at centre. In the In vivo assay,Trichoderma harzianum recorded the lowest leaf spot intensity (24.74 PDI) with per cent, while Trichoderma viride recorded the leaf spot intensity (25.68 PDI) with per cent diseasereduction 18.48 as compared to carbendazim (0.1 %) which recorded the highest per cent reduction (76.65. %) of leaf spot intensity (7.38 PDI). In vitro effect of plant extracts indicated that maximum inhibition was achieved due to neem leaf extract. (78.15 %) followed by garlic (58.89 %), sadafuli (57.04 %) and tulsi (55.93 %). The least reduction to colony diameter of the test fungus was due to glyricidia (25.93 %).

Top

Keywords

Bioagents, plant extracts, leaf spot disease, jatropha, Colletotrichum gloeosporioides.

Top