Botanical, chemical and biological management of Stemphylium botryosum blight disease of lentil in Nepal


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Authors

  • SUBASH SUBEDI*, SUNDAR MAN SHRESTHA, K.C. GOPAL BAHADUR, RESHAM BAHADUR THAPA, SURYA KANTA GHIMIRE, SARASWATI NEUPANE and BADRUN NESSA

Abstract

Integrated disease management approach was attempted for lentil stemphylium blight caused by Stemphylium botryosum Walr during 2011-12 and 2012-13 in vitro, in vivo and also screened for host resistance genotypes. Over years, botanicals Acorus calamus L. and Xanthozylum armatum DC, fungicides Mancozeb and Krilaxyl and antagonist Trichoderma viridae were effective for disease control and yield increment. Extract of A. calamus at higher dose (8% W/V) and Krilaxyl even at lower (500 ppm) checked the pathogen growth completely in-vitro. On 5th day of incubation period, mycelium growth of the pathogen was collapsed due to fungal antagonist T. viridae. Mycelial growth inhibition percent of X. armatum (8% W/V) and Mancozeb (2000 ppm) on PDA was 31.17 and 55.94, respectively. In field, botanicals were sparingly effective for a short period. Percent disease control (PDC) was higher in A. calamaus (46.60%) and X. armatum (46.26%) compared to unsprayed plot. Higher percent yield increase (PYI) was obtained from Krilaxyl (71.22%) and Mancozeb (55.31%) @ 2 g/l of water over control. The lower Percent Disease Index (PDI) was observed in Krilaxyl (36.00) and Mancozeb (37.35). The PDC and PYI were higher in T. viridae (PPD isolate) i.e. 42.14% and 58.80% respectively. Out of 58 genotypes screened, RL-28, ILL 10134, RL-44, FLIP 2008-7L, NR-2001-71-3, NR-2001-71-4 and ILL 7657 were found resistant to the disease.

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Vol. 68 No. 4 (2015): Indian Phytopathology

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Research Articles

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How to Cite

RESHAM BAHADUR THAPA, SURYA KANTA GHIMIRE, SARASWATI NEUPANE and BADRUN NESSA, S. S. S. M. S. K. G. B. (2015). Botanical, chemical and biological management of Stemphylium botryosum blight disease of lentil in Nepal. Indian Phytopathology, 68(4). https://epubs.icar.org.in/index.php/IPPJ/article/view/54622