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    Management of grey blight disease of Som plants using value added vermicompost with Glomus constrictum and Bacillus altitudinis
    (University of North Bengal, 2015-03) Acharya, A.; Chakraborty, U.; Ghosh, S.; Chakraborty, B.N.
    Grey blight disease caused by Pestalotiopsis disseminata, is one of the major foliar fungal diseases that constantly affects Persea bombycina Kost, a primary host plant of muga silkworm. Under nursery condition, grey blight disease was recorded mostly in SS and S6 morphotypes of som plants. Vermicompost, PGPR and AMF, alone and in combination were applied for the improvement of the growth of eight morphotypes of som plant as well as to reduce incidence. Growth in terms of height (cm), no. of leaves and no. of branches were studied. Analysis of some major defence related enzymes such as POX, PAL, CHT and GLU was also carried out to check induction of resistance after treatment. Artificial inoculation of som plants under nursery condition with spore suspension of P. disseminata was performed and disease progression noted for 7, 14, 21 and 28 days. It was clearly seen that disease progression was slow and less in treated inoculated plants. The results emphasize the fact that application of bioinoculants can be studied in larger scale for the upliftment of the health status of muga host plants.
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    Physico-chemical analysis of rhizospheric soil, mycorrhizal association and root colonization of Mulberry (Morus alba L) plants grown in Kalimpong hills
    (University of North Bengal, 2014-03) Acharya, A.; Allay, S.; Ram, R. L.; Chakraborty, B. N.
    Morus alba L, known as white mulberry, is widely cultivated in the hills and its leaves are the major source of food for the silkwoms (Bombya mori L.) employed in the commereial production of silk. The physico-chemical properties of the soil where this plant is cultivated were analysed. The soils analysed had medium to high nitrogen content, but low to medium phosphorus and potash. Since mycorrhizal fungi can help in nutrient mobilization, AMF associated with the rhizosphere of the mulberry tree cultivated in RSRS, Kalimpong were extensively studied in relation to their population in soil, root colonization as well as their diversity. Predominant species of Glomus and few species of Gigaspora was determined. Histo-pathological studies of host roots showed the presence of vesicles and different kind of hyphal network. AMF spores were tried to be identified up to species level with the belp of standard keys. The result indicates that various species of AMF have established successful colonization with the host plant that will further support and help the plant for better growth and development