|
[article] | 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 |
|
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