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Evaluation of rice genotypes for resistance to sheath blight under field contions / Bedanand Chaudhary
in Proceedings of the 27th National Summer Crops Workshop, held at Rampur, Chitawan, 18-20 April 2013, Vol. I / Giri, Y.P.
Title : Evaluation of rice genotypes for resistance to sheath blight under field contions Material Type: printed text Authors: Bedanand Chaudhary ; Nabin Kumar Dangal, Author ; Parbati Joshi, Author ; Sudeep Kumar Upadhyay, Author Pagination: 303-312 p. Languages : English (eng) Keywords: Genotypes ; resistance field conditions sheath blight Abstract: Sheath blight of rice, caused by Rhizoctonia sol ani, is one of the most important rice diseases
worldwide; however, no rice cultivar has been found to be completely resistant to this fungus .
Resistance of rice to sheath blight is quantitative, and involves two mechanisms:
physiological resistance and disease escape. Disease escape is mainly governed by plant
structure or plant morphology and physiologically resistance genotypes may exhibit disease in
the field conditions. Therefore, field screening experiments were conducted to address
morphological resistance (disease escape) in rice to sheath blight during the 2011 and 2012
wet season at Regional Agricultural Research Station, Tarahara. A total of28 in 2011 and 174
rice genotypes in 2012 were tested for morphological resistance. The susceptible hill (Swama)
of 56 day old plants was inoculated with infected pieces of rice stem. Number of infected
tillers of test entries was recorded on 14 days after inoculation and continued for three
scorings in both years at 7 day-intervals. During 20 11 disease incidence and area under
disease progress curve (AUDPC) varied significantly among the tested rice genotypes. The
varieties Tetep and lAC 165 had the lowest and highest terminal disease incidence and
AUDPC, respectively. Sabitri, MTU 1010 and IR 26 also recorded lower AUDPC values.
During 2012, rice genotypes varied for disease incidence from 0.0 to 50%. Disease incidence
progressed fast in some entries especially in quality rice. In the first scoring, 24 entries were
disease free (DF) and 32 were moderately resistant (MR). Out of 174 entries, 109, 8 and l
lines were moderately susceptible (MS), Susceptible (S) and highly susceptible (HS),
respectively. In the second scoring, 48, 26, 86 and 14 lines were DF, MR, MS and S,
respectively, to the disease. In the final scoring, IR 79913 -B-1 76-B-4, NR 1887-8-1-1-2,
IR79907-B-425-B-3 , IR 83381-B-B-7-1 and IR 87751 -20-4-4-2 were disease free. Out of
174, 29 genotypes were MR; similarly, 128, 11 and I were MS, S and HS to the disease,
respectively. Based on AUDPC values, 5 genotypes were grouped as DF, 67 as MR, 92 as MS
and 10 as S, respectively. More number of entries scored disease free in the second scoring
than that in the ftrst one. This was because separate hills were considered for scoring in the
different dates. Thus, the result showed that the disease incidence in rice genotypes differed
depending on microclimate conditions of the plantsLink for e-copy: http://elibrary.narc.gov.np/?r=916 Evaluation of rice genotypes for resistance to sheath blight under field contions [printed text] / Bedanand Chaudhary ; Nabin Kumar Dangal, Author ; Parbati Joshi, Author ; Sudeep Kumar Upadhyay, Author . - [s.d.] . - 303-312 p.
in Proceedings of the 27th National Summer Crops Workshop, held at Rampur, Chitawan, 18-20 April 2013, Vol. I / Giri, Y.P.
Languages : English (eng)
Keywords: Genotypes ; resistance field conditions sheath blight Abstract: Sheath blight of rice, caused by Rhizoctonia sol ani, is one of the most important rice diseases
worldwide; however, no rice cultivar has been found to be completely resistant to this fungus .
Resistance of rice to sheath blight is quantitative, and involves two mechanisms:
physiological resistance and disease escape. Disease escape is mainly governed by plant
structure or plant morphology and physiologically resistance genotypes may exhibit disease in
the field conditions. Therefore, field screening experiments were conducted to address
morphological resistance (disease escape) in rice to sheath blight during the 2011 and 2012
wet season at Regional Agricultural Research Station, Tarahara. A total of28 in 2011 and 174
rice genotypes in 2012 were tested for morphological resistance. The susceptible hill (Swama)
of 56 day old plants was inoculated with infected pieces of rice stem. Number of infected
tillers of test entries was recorded on 14 days after inoculation and continued for three
scorings in both years at 7 day-intervals. During 20 11 disease incidence and area under
disease progress curve (AUDPC) varied significantly among the tested rice genotypes. The
varieties Tetep and lAC 165 had the lowest and highest terminal disease incidence and
AUDPC, respectively. Sabitri, MTU 1010 and IR 26 also recorded lower AUDPC values.
During 2012, rice genotypes varied for disease incidence from 0.0 to 50%. Disease incidence
progressed fast in some entries especially in quality rice. In the first scoring, 24 entries were
disease free (DF) and 32 were moderately resistant (MR). Out of 174 entries, 109, 8 and l
lines were moderately susceptible (MS), Susceptible (S) and highly susceptible (HS),
respectively. In the second scoring, 48, 26, 86 and 14 lines were DF, MR, MS and S,
respectively, to the disease. In the final scoring, IR 79913 -B-1 76-B-4, NR 1887-8-1-1-2,
IR79907-B-425-B-3 , IR 83381-B-B-7-1 and IR 87751 -20-4-4-2 were disease free. Out of
174, 29 genotypes were MR; similarly, 128, 11 and I were MS, S and HS to the disease,
respectively. Based on AUDPC values, 5 genotypes were grouped as DF, 67 as MR, 92 as MS
and 10 as S, respectively. More number of entries scored disease free in the second scoring
than that in the ftrst one. This was because separate hills were considered for scoring in the
different dates. Thus, the result showed that the disease incidence in rice genotypes differed
depending on microclimate conditions of the plantsLink for e-copy: http://elibrary.narc.gov.np/?r=916 E-copies
http://nkcs.org.np/narc/dl/?r=916URL
in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.
Title : Status of sheath blight disease of rice in central terai of Nepal Material Type: printed text Authors: DB Gharti ; J.B Sah, Author ; Shrestha, C.L., Author ; Khadge, B.R., Author Pagination: 353-362 p. Languages : English (eng) Keywords: Thanatephorus cucumeris ; rice sheath blight prevalance yield loss genetic resistance Abstract: This study consisted of field survey, yield loss assessment and disease screening nursery
undertaken at RARS, Parwanipur and its command area during 2001102 and 2002103 with a ·
view to know the status of sheath blight disease of rice in Central Terai of Nepal and plan
future research programs accordingly. Survey in few command districts revealed sheath
blight prevalence in 75. 7% surveyed fields. Farmers reported almost 28% yield loss due to
this disease in susceptible farmer adopted rice variety "Sona Masuli" However, yield loss
assessment at the research station showed 9. 44% yield loss in this particular variety. Yield
losses varied between 4. 77 to 9.44% in different varieties. However, yield differences
between sprayed and non- sprayed plots were non significant. Relative lesion height was
significantly different among the tested genotypes and between the spray treatments as well.
Sheath Blight Screening Nursery conducted during 2001102 and 2002103 indicated NR 1769- -
20-2-2-3-4 as resistant genotype to rice sheath blight. Genotypes/varieties like Pusa 834, NR
1558-76-1-1-2-3-1-2-3, FRX 29F3B-5F6BF7, FRX 29F5B-5F6BF8, Sabitri, Radha-11,
Jaya, NR 1743-1-2-4-1-2-2, BR 802-78-2-1, NR 1736-4-6-2-1-1-1 were found moderately
resistant over years.Link for e-copy: http://elibrary.narc.gov.np/?r=1123 Status of sheath blight disease of rice in central terai of Nepal [printed text] / DB Gharti ; J.B Sah, Author ; Shrestha, C.L., Author ; Khadge, B.R., Author . - [s.d.] . - 353-362 p.
in Rice research in Nepal : Proceedings of 24th National Summer Crops Research Workshop, Khumaltar, Lalitpur, 30-31 June 2004 / Adhikari, N.P.
Languages : English (eng)
Keywords: Thanatephorus cucumeris ; rice sheath blight prevalance yield loss genetic resistance Abstract: This study consisted of field survey, yield loss assessment and disease screening nursery
undertaken at RARS, Parwanipur and its command area during 2001102 and 2002103 with a ·
view to know the status of sheath blight disease of rice in Central Terai of Nepal and plan
future research programs accordingly. Survey in few command districts revealed sheath
blight prevalence in 75. 7% surveyed fields. Farmers reported almost 28% yield loss due to
this disease in susceptible farmer adopted rice variety "Sona Masuli" However, yield loss
assessment at the research station showed 9. 44% yield loss in this particular variety. Yield
losses varied between 4. 77 to 9.44% in different varieties. However, yield differences
between sprayed and non- sprayed plots were non significant. Relative lesion height was
significantly different among the tested genotypes and between the spray treatments as well.
Sheath Blight Screening Nursery conducted during 2001102 and 2002103 indicated NR 1769- -
20-2-2-3-4 as resistant genotype to rice sheath blight. Genotypes/varieties like Pusa 834, NR
1558-76-1-1-2-3-1-2-3, FRX 29F3B-5F6BF7, FRX 29F5B-5F6BF8, Sabitri, Radha-11,
Jaya, NR 1743-1-2-4-1-2-2, BR 802-78-2-1, NR 1736-4-6-2-1-1-1 were found moderately
resistant over years.Link for e-copy: http://elibrary.narc.gov.np/?r=1123 E-copies
http://nkcs.org.np/narc/dl/?r=1123URL
in Summer crops research in Nepal: Proceedings of the 25th Summer Crops Workshop held at Kathmandu 21-23 June 2007 / Adhikari, N.P.
Title : Varietal evaluation of rice for disease resistance in the high hills at Jumla Material Type: printed text Authors: Vaidya, M.L., Editor Publication Date: 2010 Pagination: 427-428 p. Keywords: Sheath brown rot ; rice ;sheath blight Abstract: Sheath brown rot (Pseudomonoas fuscovaginae) Sheath blight (Rhizoctonia so/ani) disease recently is prevailing in Jumla so it has
become quite necessary to carry out a study over it. Therefore, as an initiative this triaql has been conducted in Agricultural Research
Station, Jumla to find out the resistant and susceptible genotype against this disease. The experiment was laid out in Randomized
Complete Block Design (RCBD) with nine treatments and three replications. The statistical analysis showed significant difference in
terms of yield and diseases resistance among the nine genotypes evaluated NR 10288-0lSJ-OlSJ-7 and NR 10262-9-2-3 have been
found resistant to both disease so far.Link for e-copy: http://elibrary.narc.gov.np/?r=1048 Varietal evaluation of rice for disease resistance in the high hills at Jumla [printed text] / Vaidya, M.L., Editor . - 2010 . - 427-428 p.
in Summer crops research in Nepal: Proceedings of the 25th Summer Crops Workshop held at Kathmandu 21-23 June 2007 / Adhikari, N.P.
Keywords: Sheath brown rot ; rice ;sheath blight Abstract: Sheath brown rot (Pseudomonoas fuscovaginae) Sheath blight (Rhizoctonia so/ani) disease recently is prevailing in Jumla so it has
become quite necessary to carry out a study over it. Therefore, as an initiative this triaql has been conducted in Agricultural Research
Station, Jumla to find out the resistant and susceptible genotype against this disease. The experiment was laid out in Randomized
Complete Block Design (RCBD) with nine treatments and three replications. The statistical analysis showed significant difference in
terms of yield and diseases resistance among the nine genotypes evaluated NR 10288-0lSJ-OlSJ-7 and NR 10262-9-2-3 have been
found resistant to both disease so far.Link for e-copy: http://elibrary.narc.gov.np/?r=1048 E-copies
http://nkcs.org.np/narc/dl/?r=1048URL