Dr. Saranya Devi K
Bio-fungicide potential of araucaria columnaris (cook pine) aqueous resin extract against major phytopathogens.
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Use of chemical fungicide to control plant diseases causes several adverse effects such as, development of resistance in the pathogen, residual toxicity, pollution to the environment etc. So an alternative way to overcome the usage of dreadful chemicals is very important. The use of plant extracts as biofungicide is one of the popular and effective method. Araucaria columnaris is a commonly seen ornamental plant known as Christmas tree. It’s a South African species, under the family Araucariaceae. Hence, in the present study, the plant resin extract was tested in-vitro against major plant pathogensby preliminary bioassay. It was found that up to 95% reduction of mycelium growth was observed against major phytopathogens such as Fusarium oxysporyum, Rhizoctoniasp, Cylindrocladiumsp, Alternariasp, and Colletrotricum sp., causing tomato wilt, damping off, foliage blight, and leaf blight diseases in economically important plants. Up to our knowledge it is the first report showing the antifungal activity of Araucaria columnaris resin as antifungal agent. By using this valuable tree, further work will be done to formulate commercial biofungicide.
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