ECO-FRIENDLY MANAGEMENT OF INSECT PESTS OF MAIZE WITH SPECIAL REFERENCE TO STEM BORER
Loading...
Date
2012
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Birsa Agricultural University, Kanke, Ranchi, Jharkhand
Abstract
The field experiment was conducted to study the “Eco-friendly management
of insect pests of maize with special reference to stem borer” on maize variety
HQPM-1during kharif 2010 in the research farm of Birsa Agricultural University,
Ranchi. The five pests were observed i.e. stem borer, leaf folder, grasshopper,
termite and cob borer. The maximum infestation of stem borer (19.6%), leaf folder
(8.6%), dead heart (2.6%) and termite (4.6%) was recorded at research farm BAU
and grasshopper (5.3%) at khunti and cob borer (3.2%) at Manatu, respectively.
The first infestation of insect was noticed on 3rd August 2010 (31st std. wk.)
which increased to the level of 6.9 per cent on 17th August 2010 (33rd std. wk.) and
thereafter declining trend was noticed and its infestation came down to the level of
2.7 per cent on (40th standard week). The similar trend was noticed in the case of
dead heart and leaf folder.
The maximum temperature was significant and positive correlation with
stem borer infestation (0.707**) and dead heart (0.700**) as well as leaf folder
(0.601*) infestation. The maximum relative humidity showed significant and
negative effect on stem borer infestation (-0.641*), dead heart (-0.606*) and leaf
folder (-0.638*) damage. Out of 25 genotypes screened, 15 genotypes were found to
be less susceptible. The rest 10 genotypes were grouped into moderately
susceptible category. The 14 genotype had mean tunnel length below 10.0cm and
the rest genotypes had mean tunnel length above 10.0cm. The six genotypes had
mean exit hole above five while rest genotypes were having exit hole below five.
The highest reduction in dead heart was recorded in treatment T7 Karanj
oil+Imidacloprid (2.8%) followed by T5 Neem oil+Imidacloprid (3.9%) and T3
Imidacloprid (4.5%). The mean plant infestation was recorded to be lowest with
Karanj oil+Imidacloprid (14.1%) followed by Neem oil+Imidacloprid (24.2%). The
highest reduction in stem tunneling (2.7%) was recorded in T7 Karanj
oil+Imidacloprid @ 10ml+2ml/L water followed by T5 Neem oil+Imidacloprid @
10ml+2ml/L water (5.4), T6 Neem oil+Bt (6.3) and T3 Imidacloprid @ 2ml/L water
(7.5). The mean number of exit hole/plant was recorded to be lowest with T7 having
Karanj oil+Imidacloprid treatment (0.6) followed by T5 Neem oil+Imidacloprid
treatment (1.5). The treatment Karanj oil+Imidacloprid was found effective in
reducing dead heart, showing minimum plant infestation, stem tunneling and exit
holes. The maximum yield was recorded in Karanj oil +Imidacloprid (39.5 q/ha)
closely followed by Neem oil +Imidacloprid (37.5q/ha). The highest cost benefit ratio
was recorded in the combination of Karanj oil+Imidacloprid @ 10ml+2ml/L water
followed by Neem oil+Imidacloprid @ 10ml+2ml/L water.
Description
ECO-FRIENDLY MANAGEMENT OF INSECT PESTS OF MAIZE WITH SPECIAL REFERENCE TO STEM BORER
Keywords
null