|
[article] | Title : |
Yield Loss and Economic Threshold Level of Soybean due to Leaf Roller (Apoderus Cyaneus Hope) in Nepal |
| Material Type: |
printed text |
| Authors: |
Gyawali, Bishnu K., Author |
| Publication Date: |
2005 |
| Article on page: |
73-77 p |
| Languages : |
English (eng) |
| Keywords: |
Economic threshold level, leaf roller, physiological growth stages, yield loss |
| Abstract: |
Yield loss in soybean due to leaf roller (Apoderus cyaneus Hope) was studied at Khumaltar during
1985 and 1986 seasons. Field experiments were conducted during vegetative as well as reproductive
stages of soybean. Rolled leaves of soybean with eggs, grubs and pupae were collected from the
field and reared in the laboratory for adults. Adults were introduced into nylon cages installed at
the central rows of each plot just after germination of soybean. Insects were maintained at
population density of 25, 50 and 100 per m2. At maximum (100) adult density, the potential grain
yield loss of cultivar, Ransom soybean in its vegetative and reproductive stages were 103 and 48 mg
per day respectively from each adult of A. cyaneus. Percentages of yield losses were 36.2, 45.2,
and 58.0 during vegetative and 37.5, 48.5 and 66.0 during reproductive stages from the insect
population of 25, 50 and 100, respectively which, was
not in accordance with the level of two and four fold increased population density of insect. Yield
reduction was higher (260 and 108 mg per day) from each adult beetle at lower population level (25)
in both vegetative and reproductive stages of soybean.
|
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=64 |
in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 73-77 p
[article] Yield Loss and Economic Threshold Level of Soybean due to Leaf Roller (Apoderus Cyaneus Hope) in Nepal [printed text] / Gyawali, Bishnu K., Author . - 2005 . - 73-77 p. Languages : English ( eng) in Nepal Agriculture Research Journal > Vol. 6 (2005) . - 73-77 p | Keywords: |
Economic threshold level, leaf roller, physiological growth stages, yield loss |
| Abstract: |
Yield loss in soybean due to leaf roller (Apoderus cyaneus Hope) was studied at Khumaltar during
1985 and 1986 seasons. Field experiments were conducted during vegetative as well as reproductive
stages of soybean. Rolled leaves of soybean with eggs, grubs and pupae were collected from the
field and reared in the laboratory for adults. Adults were introduced into nylon cages installed at
the central rows of each plot just after germination of soybean. Insects were maintained at
population density of 25, 50 and 100 per m2. At maximum (100) adult density, the potential grain
yield loss of cultivar, Ransom soybean in its vegetative and reproductive stages were 103 and 48 mg
per day respectively from each adult of A. cyaneus. Percentages of yield losses were 36.2, 45.2,
and 58.0 during vegetative and 37.5, 48.5 and 66.0 during reproductive stages from the insect
population of 25, 50 and 100, respectively which, was
not in accordance with the level of two and four fold increased population density of insect. Yield
reduction was higher (260 and 108 mg per day) from each adult beetle at lower population level (25)
in both vegetative and reproductive stages of soybean.
|
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=64 |
|
Refine your searchFeeding behavior and damage assessment of rice bug, (Leptocorisa oratorius (Fabricius) on rice / Gyawali, Bishnu K.
Yield Loss and Economic Threshold Level of Soybean due to Leaf Roller (Apoderus Cyaneus Hope) in Nepal / Gyawali, Bishnu K. in Nepal Agriculture Research Journal, Vol. 6 (2005)
