Integrated Approach for the Management of New Threat Stemphylium botryosum walr Causing Blight of Lentil (Lens culinaris Medik)

Subash Subedı; Sundar Man Shrestha; Gopal Bahadur Kc; Resham Bahadur Thapa; Surya Kanta Ghımıre; Dhan Bahadur GHARTI Saraswati Neupane

Integrated Approach for the Management of New Threat Stemphylium botryosum walr Causing Blight of Lentil (Lens culinaris Medik)

Year 2014, Volume: 1 Issue: Özel Sayı-1, 1209 - 1220, 01.03.2014

Subash Subedı Sundar Man Shrestha Gopal Bahadur Kc Resham Bahadur Thapa Surya Kanta Ghımıre Dhan Bahadur GHARTI Saraswati Neupane

Abstract

Efforts were made to study integrated disease management for lentil stemphylium blight caused by Stemphylium botryosum Walr at GLRP, Rampur, Chitwan, Nepal during 2011/12 and 2012/13 using CRD in laboratory (in-vitro), RCBD in field (in-vivo) and screening host resistance genotypes. Over years, botanicals Acorus calamus L. and Zanthozylum armatum DC, fungicides Mancozeb and Krilaxyl and antagonist Trichoderma viridae were effective for disease control and yield increment. Acorus calamus L. at higher dose (8% W/V) and Krilaxyl even at lower (500 ppm) on potato dextrose agar (PDA) checked the pathogen growth completely in-vitro. On 5th day of incubation period, mycelium growth of the pathogen was collapsed by fungal antagonist T. viridae. The mycelial growth inhibition percent of Z. armatum DC (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. The Percent disease control (PDC) was higher in A. calamaus L. (46.60%) and Z. armatum DC (46.26%) compared to unsprayed plot. The higher percent yield increase (PYI) was obtained from Krilaxyl (71.22%) and Mancozeb (55.31%) and @ 2 gm/litre 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, in screening nursery, RL-28, ILL 10134, RL-44, FLIP 20087L, NR-2001-71-3, NR-2001-71-4, ILL 7657, ILL 2437, ILL 7349, RL 23, RL 25, RL 47, RL 62, ILL 10856 were found resistant to the disease

Keywords

Lentil, Stemphylium botryosum, botanicals, fungicides, antagonist, resistant genotypes

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