ANTIFUNGAL ACTIVITY OF SELECTED PLANT EXTRACTS ON PERIDIOPSORA MORI CAUSING BROWN RUST IN MULBERRYAbstract
Peridiopsora mori (Barclay) K.V. Prasad, B.R.D. Yadav & Sullia is one of the fungi which cause brown leaf rust on Mulberry (Morus spp.). Leaf rust disease is one of the major diseases affecting Mulberry (Morus sp.). Synthetic fungicides are commonly applied to reduce disease; however, its improper use may cause residual toxicity on silkworm, environmental and health problems. The extracts of angiosperm medicinal plants were proven by previous workers to possess antimicrobial activities against plant pathogenic fungi. In this study, the antifungal activity of leaf extracts of 5 rarely occurring medicinal plants in Kerala (Mesua ferrea L., Memecylon randerianum S. M. Almeida & M. R. Almeida, Pittosporum tetraspermum Wight & Arn., Symplocos cochinchinensis (Lour.) S. Moor and Syzygium laetum (Buch.-Ham.) Gandhi) were tested against Peridiopsora mori. Antifungal activity of the leaf extract was tested based on the poisoned food technique on potato dextrose agar (PDA). Leaf extracts, 5%, 10%, 15%, 20% and 25% were tested in this study. The results of this study showed that leaf extract of all the selected plants in different concentration suppressed the growth of Peridiopsora mori significantly. It was observed that the lowest concentration of leaf extract (5%) of Pittosporum tetraspermum was most effective to inhibit the mycelial growth, followed by Syzygium laetum, Symplocos cochinchinensis. But in a higher concentration of leaf extract, Syzygium laetum was most effective to inhibit the mycelial growth, followed by Pittosporum tetraspermum and Symplocos cochinchinensis. Mesua ferrea and Memecylon randerianum were least effective in all the concentrations. The leaf extracts inhibited the fungal radial growth, total biomass, and sporulation significantly.
J. John *, P. R. Ragi, K. A. Sujana and N. A. Kumar
M. S. Swaminathan Research Foundation, Puthoorvayal P. O., Wayanad, Kerala, India.
13 July 2014
18 August 2014
28 August 2014
01 September 2014