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6 result(s) search for keyword(s) 'severity'
Determination of a relationship between disease severity of leaf blight of wheat and grain yield loss / P.C.P. Chaurasia
in National Wintercrops Technology Workshop, September 7-10, 1995 (Bhadra 22-25, 2052): Proceedings of Wheat Research Reports, National Wheat Research Program, Siddharthanagar, Bhairahawa / Rabindra Nath Devkota
Title : Determination of a relationship between disease severity of leaf blight of wheat and grain yield loss Material Type: printed text Authors: P.C.P. Chaurasia, Author Pagination: 355-359 p. Languages : English (eng) Keywords: Leaf Blight, Commulative disease severity regression. Abstract: Sixty-six single hill plants were randomly selected and pagged Disease severity of leaf blight was scored on all leaves including flag leaf separately. Three srades of commulative disease severity were calculated and regressed with grain yield to establish a relationship between percentage disease severity and grain yield The commulative disease severity based on flag leaf or 2nd plus flag leaves gives better estimate of yield loss at various leaves of disease severity.
Link for e-copy: http://elibrary.narc.gov.np/?r=2787 Determination of a relationship between disease severity of leaf blight of wheat and grain yield loss [printed text] / P.C.P. Chaurasia, Author . - [s.d.] . - 355-359 p.
in National Wintercrops Technology Workshop, September 7-10, 1995 (Bhadra 22-25, 2052): Proceedings of Wheat Research Reports, National Wheat Research Program, Siddharthanagar, Bhairahawa / Rabindra Nath Devkota
Languages : English (eng)
Keywords: Leaf Blight, Commulative disease severity regression. Abstract: Sixty-six single hill plants were randomly selected and pagged Disease severity of leaf blight was scored on all leaves including flag leaf separately. Three srades of commulative disease severity were calculated and regressed with grain yield to establish a relationship between percentage disease severity and grain yield The commulative disease severity based on flag leaf or 2nd plus flag leaves gives better estimate of yield loss at various leaves of disease severity.
Link for e-copy: http://elibrary.narc.gov.np/?r=2787 E-copies
http://nkcs.org.np/narc/dl/?r=2787URL Evaluation of pesticides against grey leaf spot disease of maize in the eastern mid-hills of Nepal / N.K Dangal
in Proceedings of the 27th National Summer Crops Workshop, held at Rampur, Chitawan, 18-20 April 2013, Vol. II / Giri, Y.P.
Title : Evaluation of pesticides against grey leaf spot disease of maize in the eastern mid-hills of Nepal Material Type: printed text Authors: N.K Dangal, Editor ; P Joshi ; D.L. Mandal, Author ; Chaudhary, R.N., Author ; Chaudhary, B.N., Author Pagination: 318-321 p. Keywords: Bio-control agent cercospora zeae maydis ; disease severity scory yield Abstract: Grey leaf spot (GLS), caused by Cercospora zeae maydis, is a major disease of maize in the
eastern hills of Nepal. It is also becoming a threat to maize cultivation in the western hills
ofthe country. A field experiment was conducted during 2011 and 2012 in the eastern mid
hills of Nepal to identify the effective pesticides for management of the disease. The
experiment was conducted in Diktel, Khotang at 1400 mas) under natural incidence of grey
leaf spot disease. The experiment was conducted in a randomized complete block design
with 3 replications. Local variety of maize was planted in a plot of 9 m2
• Five pesticides
including bio-control agents were evaluated along with a control (water spray) for their
efficacy in the management of grey leaf spot of maize. The treatments were
Metalaxyi+Mancozeb, Carbendazim, Copper oxychloride, Pseudomonas+ Trichoderma and
Pseudomonas, The pesticideswere applied after the appearance of the disease at silking
stage. Disease scoring was done at 15 days after spraying. Pesticides and bio-control agents
differed significantly in controlling the target disease and producing higher grain yield.
Carbendazim and Metalaxyi+Mancozeb were equally effective in lowering disease severity
(45 .53 and 46.87%). Use of Copper oxychloride (48.33%) was similar to use of
Pseudomonas+Trichoderma (54.17%) in minimizing disease severity. All chemicals and
bio-control agents were superior to control in managing grey leaf spot and producing higher
grain yield. Application of Carbendazim produced the highest grain yield (3.84 tlha)
followed by Metalaxyl+Mancozeb (3.80 tlha) and Copper oxychloride (3.66 t/ha).The
control plot recorded the highest disease severity of 61.53% with production of the lowest
grain yield of 3.03 t/ha. Thus, incidence and severity of the grey leaf spot disease can be
minimized with higher grain production of maize by the use of pesticide Carbendazim in
the disease prone areas of eastern hills.Link for e-copy: http://elibrary.narc.gov.np/?r=961 Evaluation of pesticides against grey leaf spot disease of maize in the eastern mid-hills of Nepal [printed text] / N.K Dangal, Editor ; P Joshi ; D.L. Mandal, Author ; Chaudhary, R.N., Author ; Chaudhary, B.N., Author . - [s.d.] . - 318-321 p.
in Proceedings of the 27th National Summer Crops Workshop, held at Rampur, Chitawan, 18-20 April 2013, Vol. II / Giri, Y.P.
Keywords: Bio-control agent cercospora zeae maydis ; disease severity scory yield Abstract: Grey leaf spot (GLS), caused by Cercospora zeae maydis, is a major disease of maize in the
eastern hills of Nepal. It is also becoming a threat to maize cultivation in the western hills
ofthe country. A field experiment was conducted during 2011 and 2012 in the eastern mid
hills of Nepal to identify the effective pesticides for management of the disease. The
experiment was conducted in Diktel, Khotang at 1400 mas) under natural incidence of grey
leaf spot disease. The experiment was conducted in a randomized complete block design
with 3 replications. Local variety of maize was planted in a plot of 9 m2
• Five pesticides
including bio-control agents were evaluated along with a control (water spray) for their
efficacy in the management of grey leaf spot of maize. The treatments were
Metalaxyi+Mancozeb, Carbendazim, Copper oxychloride, Pseudomonas+ Trichoderma and
Pseudomonas, The pesticideswere applied after the appearance of the disease at silking
stage. Disease scoring was done at 15 days after spraying. Pesticides and bio-control agents
differed significantly in controlling the target disease and producing higher grain yield.
Carbendazim and Metalaxyi+Mancozeb were equally effective in lowering disease severity
(45 .53 and 46.87%). Use of Copper oxychloride (48.33%) was similar to use of
Pseudomonas+Trichoderma (54.17%) in minimizing disease severity. All chemicals and
bio-control agents were superior to control in managing grey leaf spot and producing higher
grain yield. Application of Carbendazim produced the highest grain yield (3.84 tlha)
followed by Metalaxyl+Mancozeb (3.80 tlha) and Copper oxychloride (3.66 t/ha).The
control plot recorded the highest disease severity of 61.53% with production of the lowest
grain yield of 3.03 t/ha. Thus, incidence and severity of the grey leaf spot disease can be
minimized with higher grain production of maize by the use of pesticide Carbendazim in
the disease prone areas of eastern hills.Link for e-copy: http://elibrary.narc.gov.np/?r=961 E-copies
http://nkcs.org.np/narc/dl/?r=961URL Evaluation of rice genotypes against bacterial leaf blight under field conditions / 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 against bacterial leaf blight under field conditions Material Type: printed text Authors: Bedanand Chaudhary ; Nabin Kumar Dangal, Author ; Parbati Joshi, Author ; Ang Tenjing Sherpa, Author Pagination: 313-318 p. Languages : English (eng) Keywords: Disease severity ; Xanthomonas oryzae pv. Genotype Resistant and Susceptible Abstract: Bacterial Leaf blight (BLB) of rice; caused by Xanthomonas oryzae pv. oryzae, is one of the
most important diseases of rice in the eastern terai ofNepal. A field screening experiment was
conducted to identify the resistance in rice to the disease during 2011 and 2012 wet season at
Regional Agricultural Research Station, Tarahara. A total of 134 (OBN-71 , RA VTRL-26,
RA VTN -21 , Quality-16) rice genotypes were evaluated for resistance in both the years. Each
entry was planted in 2 rows of 2m length. Susceptible variety of rice (purple) was planted at
an interval of every 10 entries. The pathogen was inoculated in all entries at 56 days after
transplanting using Kauffmans clipping method. The disease was scored at 21 days after
inoculation and continued for three scorings at 7 days interval using 0-9 scale. Severity of the
disease varied significantly among the tested rice genotypes in both years. Level of disease
severity was higher in most entries in 2012 than 2011 . Disease severity varied 11 to 100%.
None of the genotypes were free from the disease. Out of 134 genotypes, 34 genotypes were
moderately resistant to BLB disease during both the years which were IR09F 146, IR09F 166,
IR09Fl72, IR09F174, IR09Fl89, IR09Fll3, IR09Fl17, IR09Fl43, IR09Fl47, IR09Fl58,
IR09Fl77, IR09F229, CH-2, IR 80411-B-28-4, NR 1887-8-1-1-2, IR09Fl02, IR09F104,
IR09F187, IR09Fl95, IR09Fl03, IR09F105, IR09F106, IR09FIIO, IR09Fl23, IR09Fl78,
IR09F221 , IR09F226, IR09F283 , IR09F293, Sura vi, Sipi 5920-333 , Tarahara-1, Swarna and
Swam a sub-1. Altogether 96 genotypes were moderately resistant during 2011 which
decreased to 36 in 2012. Similarly, 16 genotypes were moderately susceptible during 2011
which increased to 55 in 2012. There were no highly susceptible genotypes during 2011 , but
32 genotypes became highly susceptible during 2012. Higher level of BLB disease was
observed in 2012 than 2011. IR 78937-B-B-B-B-1, IR 79913-B-176-B-4, IR 80973-B-186-
41-2, IR 70210-39-CPA7-1-1-4-2 were moderately resistant in 2011 but became highly
susceptible in 2012. BRRI Dhan-38, Mahima, IR70422-95-J-l , IR74052-95-3-3, Hardinath-2,
BASMATI 10 I were moderately susceptible during 2011 but became highly susceptible
during 2012. Similarly, IR 82635-B-B-47-2, Lalka basmati, IR 74371-54-1-1 , IR 86815-23-4-
1-2 and JH 15-1-1-1 were highly susceptible during 2012. Disease severity increased in
second and third scoring in all entries.Link for e-copy: http://elibrary.narc.gov.np/?r=917 Evaluation of rice genotypes against bacterial leaf blight under field conditions [printed text] / Bedanand Chaudhary ; Nabin Kumar Dangal, Author ; Parbati Joshi, Author ; Ang Tenjing Sherpa, Author . - [s.d.] . - 313-318 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: Disease severity ; Xanthomonas oryzae pv. Genotype Resistant and Susceptible Abstract: Bacterial Leaf blight (BLB) of rice; caused by Xanthomonas oryzae pv. oryzae, is one of the
most important diseases of rice in the eastern terai ofNepal. A field screening experiment was
conducted to identify the resistance in rice to the disease during 2011 and 2012 wet season at
Regional Agricultural Research Station, Tarahara. A total of 134 (OBN-71 , RA VTRL-26,
RA VTN -21 , Quality-16) rice genotypes were evaluated for resistance in both the years. Each
entry was planted in 2 rows of 2m length. Susceptible variety of rice (purple) was planted at
an interval of every 10 entries. The pathogen was inoculated in all entries at 56 days after
transplanting using Kauffmans clipping method. The disease was scored at 21 days after
inoculation and continued for three scorings at 7 days interval using 0-9 scale. Severity of the
disease varied significantly among the tested rice genotypes in both years. Level of disease
severity was higher in most entries in 2012 than 2011 . Disease severity varied 11 to 100%.
None of the genotypes were free from the disease. Out of 134 genotypes, 34 genotypes were
moderately resistant to BLB disease during both the years which were IR09F 146, IR09F 166,
IR09Fl72, IR09F174, IR09Fl89, IR09Fll3, IR09Fl17, IR09Fl43, IR09Fl47, IR09Fl58,
IR09Fl77, IR09F229, CH-2, IR 80411-B-28-4, NR 1887-8-1-1-2, IR09Fl02, IR09F104,
IR09F187, IR09Fl95, IR09Fl03, IR09F105, IR09F106, IR09FIIO, IR09Fl23, IR09Fl78,
IR09F221 , IR09F226, IR09F283 , IR09F293, Sura vi, Sipi 5920-333 , Tarahara-1, Swarna and
Swam a sub-1. Altogether 96 genotypes were moderately resistant during 2011 which
decreased to 36 in 2012. Similarly, 16 genotypes were moderately susceptible during 2011
which increased to 55 in 2012. There were no highly susceptible genotypes during 2011 , but
32 genotypes became highly susceptible during 2012. Higher level of BLB disease was
observed in 2012 than 2011. IR 78937-B-B-B-B-1, IR 79913-B-176-B-4, IR 80973-B-186-
41-2, IR 70210-39-CPA7-1-1-4-2 were moderately resistant in 2011 but became highly
susceptible in 2012. BRRI Dhan-38, Mahima, IR70422-95-J-l , IR74052-95-3-3, Hardinath-2,
BASMATI 10 I were moderately susceptible during 2011 but became highly susceptible
during 2012. Similarly, IR 82635-B-B-47-2, Lalka basmati, IR 74371-54-1-1 , IR 86815-23-4-
1-2 and JH 15-1-1-1 were highly susceptible during 2012. Disease severity increased in
second and third scoring in all entries.Link for e-copy: http://elibrary.narc.gov.np/?r=917 E-copies
http://nkcs.org.np/narc/dl/?r=917URL Nebijln (flusulfamide) on the Management of Clubroot Disease of Caullflower / Ram Devi Timila ; Janaki D. Neupane
in Proceedings of the fifth National Seminar on Horticulture June 9-10, 2008 / Nepal Agricultural Research Council (NARC) (Khumaltar, Lalitpur, Nepal)
Title : Nebijln (flusulfamide) on the Management of Clubroot Disease of Caullflower Material Type: printed text Authors: Ram Devi Timila, Author ; Janaki D. Neupane, Author Pagination: 274-279 p. Languages : English (eng) Keywords: Cauliflower, clubroot, incidence, nebijin, severity Abstract: Cultivation of cauliflower and cabbages is one of the ·important income generating
sources for the ,livelihood of the farmers of Tistung/Palung valley of Makwanpur
district .. Clubroot disease caused by Plasmodiophora brassicae Woronin is the most
devastating t;Jis.ease of brassica vegetables since last few years and causing huge
losses in cabbage_ and cauliflower production of that area. During 2006, an
experiment was conducted to find effective management tactics in farmers infested
field (farmer as replication) at Palung/Daman, Makwanpur. Nebijin was found the
most effective treatment against clubrt;Jot disease. It reduced clubroot severity and
incidence by 59.5% and 40.4% respectively. In the following consecutive year
(2007), Nebijin was further evaluated incorporating in soil @ 200 kg/h in 5 farmer's
field to verify its effectiveness. Mean clubroot severity index (1.5) and incidence
(44.7%) in Nebijin treated plot were significantly different at P=0.05 from the control
(3.9 severity index and 94% incidence). Reduction of clubroot severity and
incidence were 60.65% and 52.8% respectively by the use of Nebijin. Marketable ·
cauliflower curd yield was also increased by 162% over control. However. lime
amendment in soil · effectively reduced clubroot disease but could not be
implemented timely for its management due to intensive cropping in the area. It is
concluded that in the lack of other effective management tactics, use of Nebijin
could be a better option for integrated management of clubroot disease to enhance
economy of the farmers of that area.Link for e-copy: http://elibrary.narc.gov.np/?r=260 Nebijln (flusulfamide) on the Management of Clubroot Disease of Caullflower [printed text] / Ram Devi Timila, Author ; Janaki D. Neupane, Author . - [s.d.] . - 274-279 p.
in Proceedings of the fifth National Seminar on Horticulture June 9-10, 2008 / Nepal Agricultural Research Council (NARC) (Khumaltar, Lalitpur, Nepal)
Languages : English (eng)
Keywords: Cauliflower, clubroot, incidence, nebijin, severity Abstract: Cultivation of cauliflower and cabbages is one of the ·important income generating
sources for the ,livelihood of the farmers of Tistung/Palung valley of Makwanpur
district .. Clubroot disease caused by Plasmodiophora brassicae Woronin is the most
devastating t;Jis.ease of brassica vegetables since last few years and causing huge
losses in cabbage_ and cauliflower production of that area. During 2006, an
experiment was conducted to find effective management tactics in farmers infested
field (farmer as replication) at Palung/Daman, Makwanpur. Nebijin was found the
most effective treatment against clubrt;Jot disease. It reduced clubroot severity and
incidence by 59.5% and 40.4% respectively. In the following consecutive year
(2007), Nebijin was further evaluated incorporating in soil @ 200 kg/h in 5 farmer's
field to verify its effectiveness. Mean clubroot severity index (1.5) and incidence
(44.7%) in Nebijin treated plot were significantly different at P=0.05 from the control
(3.9 severity index and 94% incidence). Reduction of clubroot severity and
incidence were 60.65% and 52.8% respectively by the use of Nebijin. Marketable ·
cauliflower curd yield was also increased by 162% over control. However. lime
amendment in soil · effectively reduced clubroot disease but could not be
implemented timely for its management due to intensive cropping in the area. It is
concluded that in the lack of other effective management tactics, use of Nebijin
could be a better option for integrated management of clubroot disease to enhance
economy of the farmers of that area.Link for e-copy: http://elibrary.narc.gov.np/?r=260 E-copies
http://nkcs.org.np/narc/dl/?r=260URL Varietal evaluation of maize against grey leaf spot disease in the Eastern Mid-hills of Nepal / NK Dangal
in Proceedings of the 27th National Summer Crops Workshop, held at Rampur, Chitawan, 18-20 April 2013, Vol. II / Giri, Y.P.
Title : Varietal evaluation of maize against grey leaf spot disease in the Eastern Mid-hills of Nepal Material Type: printed text Authors: NK Dangal, Editor ; P Joshi, Author ; D.L. Mandal, Author ; Chaudhary, R.N., Author ; Chaudhary, B.N., Author Pagination: 326-328 p. Keywords: Cercospora zeae maydis ; improved varieties severity scoring yield Abstract: Grey leaf spot, caused by Cercospora zeae maydis, is a major disease of maize in the
eastern hills of Nepal. It has been causing significant maize yield loss in the eastern high
and mid hills, and is also spreading towards the western hills of the country. A field
experiment was conducted during 2011 and 2012 in the eastern mid hills of Nepal to
identify the high yielding GLS resistant maize variety. The experiment was conducted in
Diktel, Khotang at 1400 mas! under natural incidence of grey leaf spot disease. The
experiment was conducted in a randomized complete block design with 3 replications. Plot
size was 9 m2
• Six improved varieties (viz. Ganesh-1, Manakamana-3, Manakamana-4,
Deuti, Sheetala and Posilo makai-1) of maize were evaluated along with the local variety.
Scoring of the disease was done after the incidence of the disease at grain filling stage.
Maize genotypes differed significantly for grey leaf spot severity and grain yield. All the
improved varieties had lower disease severity and produced higher grain yield compared to
the local variety (51.13% disease severity and 3.71 tlha yield). Ganesh-1 gave the highest
grain yield (4.87 tlha) with lowest disease severity of 37.40%. Similarly, Manakamana-3,
Posilo makai-1 and Manakamana-4 yielded 4.44, 4.53 and 4.43 tlha grain yield with disease
severity of 38.87, 41.60 and 41.27%, respectively. Thus, incidence and severity of the
disease can be minimized and yield can be increased by using improved maize varieties like
Ganesh-1 and Manakamana-3 in the grey leaf spot prone areas of the eastern hills.Link for e-copy: http://elibrary.narc.gov.np/?r=963 Varietal evaluation of maize against grey leaf spot disease in the Eastern Mid-hills of Nepal [printed text] / NK Dangal, Editor ; P Joshi, Author ; D.L. Mandal, Author ; Chaudhary, R.N., Author ; Chaudhary, B.N., Author . - [s.d.] . - 326-328 p.
in Proceedings of the 27th National Summer Crops Workshop, held at Rampur, Chitawan, 18-20 April 2013, Vol. II / Giri, Y.P.
Keywords: Cercospora zeae maydis ; improved varieties severity scoring yield Abstract: Grey leaf spot, caused by Cercospora zeae maydis, is a major disease of maize in the
eastern hills of Nepal. It has been causing significant maize yield loss in the eastern high
and mid hills, and is also spreading towards the western hills of the country. A field
experiment was conducted during 2011 and 2012 in the eastern mid hills of Nepal to
identify the high yielding GLS resistant maize variety. The experiment was conducted in
Diktel, Khotang at 1400 mas! under natural incidence of grey leaf spot disease. The
experiment was conducted in a randomized complete block design with 3 replications. Plot
size was 9 m2
• Six improved varieties (viz. Ganesh-1, Manakamana-3, Manakamana-4,
Deuti, Sheetala and Posilo makai-1) of maize were evaluated along with the local variety.
Scoring of the disease was done after the incidence of the disease at grain filling stage.
Maize genotypes differed significantly for grey leaf spot severity and grain yield. All the
improved varieties had lower disease severity and produced higher grain yield compared to
the local variety (51.13% disease severity and 3.71 tlha yield). Ganesh-1 gave the highest
grain yield (4.87 tlha) with lowest disease severity of 37.40%. Similarly, Manakamana-3,
Posilo makai-1 and Manakamana-4 yielded 4.44, 4.53 and 4.43 tlha grain yield with disease
severity of 38.87, 41.60 and 41.27%, respectively. Thus, incidence and severity of the
disease can be minimized and yield can be increased by using improved maize varieties like
Ganesh-1 and Manakamana-3 in the grey leaf spot prone areas of the eastern hills.Link for e-copy: http://elibrary.narc.gov.np/?r=963 E-copies
http://nkcs.org.np/narc/dl/?r=963URL Use of Host Reducing Application of Fungicide for the Management of Potato Late Blight in Nepal / Buddhi P. Sharma, in Nepal Agriculture Research Journal, Vol.12 (2012)Permalink