Author details
Author Sundar K. Shrestha |
Available item(s) by this author
Refine your searchCharacteristics of Ralstonia Solanacearum Strains of Potato Wilt Disease from Nepal and Thailand / Dhital, S.P. in Nepal Agriculture Research Journal, Vol. 4 (2000/2001)
Title : Characteristics of Ralstonia Solanacearum Strains of Potato Wilt Disease from Nepal and Thailand Material Type: printed text Authors: Dhital, S.P., Author ; N. Thaveechai, Author ; Sundar K. Shrestha, Author Publication Date: 2000 Article on page: 42-47 p Languages : English (eng) Keywords: Key words: Bacterial wilt, potato, Pseudomonas solanacearum, Ralstonia solanacearum Abstract: Characterization of strains of Ralstonia solanacearum, the causal agent of potato bacterial wilt
disease from Nepal and Thailand was performed based on pathogenicity,
biochemical/physiological and serological tests. Fifteen R. solanacearum strains isolated from wilt
infected potato plants and tubers grown in Nepal were characterized as race 3, biovar II based on
the pathogenicity on different host plants, hypersensitive reaction on tobacco leaf and utilization of
some sugars. Results of pathogenicity test show that all strains from Nepal had limited host range.
Degree of virulence of all strains varied from high to medium in potato and tomato and medium to
low in eggplant. They did not cause wilting in tobacco, pepper and peanut plants. Six strains from
Thailand were characterized as biovar II and III. Additionally, comparisons on the physiological,
biological and serological characters of seven strains from Nepal and six from Thailand revealed
similar characters. Race 3 and biovar II of the pathogen was widely spread over potato growing
areas of mid and high hills of Nepal. Both biovars II and III were prevalent in the potato growing
areas of Thailand but biovar III was the most dominating one.Link for e-copy: http://elibrary.narc.gov.np/?r=92
in Nepal Agriculture Research Journal > Vol. 4 (2000/2001) . - 42-47 p[article] Characteristics of Ralstonia Solanacearum Strains of Potato Wilt Disease from Nepal and Thailand [printed text] / Dhital, S.P., Author ; N. Thaveechai, Author ; Sundar K. Shrestha, Author . - 2000 . - 42-47 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 4 (2000/2001) . - 42-47 p
Keywords: Key words: Bacterial wilt, potato, Pseudomonas solanacearum, Ralstonia solanacearum Abstract: Characterization of strains of Ralstonia solanacearum, the causal agent of potato bacterial wilt
disease from Nepal and Thailand was performed based on pathogenicity,
biochemical/physiological and serological tests. Fifteen R. solanacearum strains isolated from wilt
infected potato plants and tubers grown in Nepal were characterized as race 3, biovar II based on
the pathogenicity on different host plants, hypersensitive reaction on tobacco leaf and utilization of
some sugars. Results of pathogenicity test show that all strains from Nepal had limited host range.
Degree of virulence of all strains varied from high to medium in potato and tomato and medium to
low in eggplant. They did not cause wilting in tobacco, pepper and peanut plants. Six strains from
Thailand were characterized as biovar II and III. Additionally, comparisons on the physiological,
biological and serological characters of seven strains from Nepal and six from Thailand revealed
similar characters. Race 3 and biovar II of the pathogen was widely spread over potato growing
areas of mid and high hills of Nepal. Both biovars II and III were prevalent in the potato growing
areas of Thailand but biovar III was the most dominating one.Link for e-copy: http://elibrary.narc.gov.np/?r=92
Title : Role of weather on Alternaria Leaf Blight Disease and its effect on Yield and Yield Components of Mustard Material Type: printed text Authors: Sundar K. Shrestha, Author ; Lisa Munk, Author ; Mathur, S.B., Author Publication Date: 2005 Article on page: 62-72 p Languages : English (eng) Keywords: Alternaria brassicae, epidemics, iprodione, mancozeb, mustard, oil content Abstract: Alternaria leaf blight disease caused by Alternaria brassicae in mustard (Brassica juncea (L)
Czern and Coss) was studied in two crop seasons, 1992 and 1993 in Nepal at Nawalpur, Sarlahi
(Tarai) and Khumaltar, Lalitpur (mid hill). At Nawalpur, epidemics of the disease was recorded for
both seasons. Weather conditions like humidity, temperature and frequent rainfall played key role
for the epidemics. In experimental fields, the disease appeared first in mid-December when the
relative humidity was more than 80% with maximum temperature ranging between 18-250C and minimum
between 10-140C. At Khumaltar, incidence of the disease was low in both seasons due to low average
temperature from December to February. Among cultivars, Krishna and Pusabold were less susceptible
than Varuna. Both mancozeb and iprodione had effectively reduced disease in the sprayed plots and
increased seed yield by 48% and 130% respectively. The correlation between disease severity and
yield, and yield components was negative and highly significant. Average yield loss was estimated
to be in the range of 32 to 57%. Seed infection was also significantly higher in non sprayed
treatment than sprayed one. The disease showed a negative effect on oil content causing losses on
oil between 4.2 to 4.5%.Link for e-copy: http://elibrary.narc.gov.np/?r=63
in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 62-72 p[article] Role of weather on Alternaria Leaf Blight Disease and its effect on Yield and Yield Components of Mustard [printed text] / Sundar K. Shrestha, Author ; Lisa Munk, Author ; Mathur, S.B., Author . - 2005 . - 62-72 p.
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 62-72 p
Keywords: Alternaria brassicae, epidemics, iprodione, mancozeb, mustard, oil content Abstract: Alternaria leaf blight disease caused by Alternaria brassicae in mustard (Brassica juncea (L)
Czern and Coss) was studied in two crop seasons, 1992 and 1993 in Nepal at Nawalpur, Sarlahi
(Tarai) and Khumaltar, Lalitpur (mid hill). At Nawalpur, epidemics of the disease was recorded for
both seasons. Weather conditions like humidity, temperature and frequent rainfall played key role
for the epidemics. In experimental fields, the disease appeared first in mid-December when the
relative humidity was more than 80% with maximum temperature ranging between 18-250C and minimum
between 10-140C. At Khumaltar, incidence of the disease was low in both seasons due to low average
temperature from December to February. Among cultivars, Krishna and Pusabold were less susceptible
than Varuna. Both mancozeb and iprodione had effectively reduced disease in the sprayed plots and
increased seed yield by 48% and 130% respectively. The correlation between disease severity and
yield, and yield components was negative and highly significant. Average yield loss was estimated
to be in the range of 32 to 57%. Seed infection was also significantly higher in non sprayed
treatment than sprayed one. The disease showed a negative effect on oil content causing losses on
oil between 4.2 to 4.5%.Link for e-copy: http://elibrary.narc.gov.np/?r=63
Title : Rosellinia Rot: A New Record of Potato Disease in Nepal Material Type: printed text Authors: Sundar K. Shrestha, Author Publication Date: 2004 Article on page: 71-72 p General note: Research note Languages : English (eng) Link for e-copy: http://elibrary.narc.gov.np/?r=83
in Nepal Agriculture Research Journal > Vol. 5 (2004) . - 71-72 p[article] Rosellinia Rot: A New Record of Potato Disease in Nepal [printed text] / Sundar K. Shrestha, Author . - 2004 . - 71-72 p.
Research note
Languages : English (eng)
in Nepal Agriculture Research Journal > Vol. 5 (2004) . - 71-72 p
Link for e-copy: http://elibrary.narc.gov.np/?r=83
