In-vitro studies on antagonistic potential of biocontrol agents against tea pathogens. Hypoxylon sp. and Pestalotiopsis sp

摘要

Grey blight disease caused by Pestalotiopsis theae is an economically important disease, which has been reported from all major tea-growing countries of the world (Muraleedharan and Chen, 1997). The disease generally affects mature leaves, through itappears on bare stalks and young shoots as well (Sanjay and Baby, 2005). In southern India, grey blight disease is noticed throughout the year, peak during July to December (Baby and Sanjay, 2006). Wood rot is another important fungal disease caused by Hypoxylon serpens (Pers. ex Fr.) (Agnihothrudu, 1967). These pathogens used to invades the aerial parts of the tea bushes, main stem and branches. Biological control using beneficial and efficient microorganisms can be economic, self perpetuating and usually free from residual side effects (Lemanceau and Alabouvette, 1993). The present investigation is an attempt to confirm the bio control potential of selected strains in controlling Grey blight and Wood rot diseases in tea.