Abstract:
A field study was carried out in the farm of Sher-e-Bangla Agricultural University
during May to June, 2009 to investigate the effect of different application methods
of imidacloprid on abundance and management of jassid in okra. The population
of jassid was gradually increased with the age of the crop and the peak population
was found on last week of May and it was remained constant after that. The lowest
number of jassid (16.47/plant) was found in T2 (seed treatment by Gauchu 70WS
+ foliar spray with Admire 200SL), which reduced 77.71% population of jassid
over control. Plant height, number of fruits/plot and yield per plot were
significantly increased under different treatments. The highest plant height (244.8
cm), number of fruits/plant (652) and yield (13.84 t/ha) were observed in T2 (seed
treatment by Gauchu 70WS + foliar spray with Admire 200SL) treated plot. The
result of T4 (seed treatment by Gauchu 70WS + band application of Gauchu
70WS) and T5 (pre-plant injection by Gauchu 70WS at a depth of 4cm below the
seed line + foliar spray with Admire 200SL) were statistically similar with T2
(seed treatment by Gauchu 70WS + foliar spray with Admire 200SL) treated plot.
The highest benefit cost-ratio (BCR) was obtained in T1 (23.22) and the highest
adjusted net return (Tk. 41,300) was obtained in T2 which was found as the best
treatment in this study. Considering jassid population, plant growth, number of
fruits and fruit yield, T2 (seed treatment by Gauchu 70WS + foliar spray with
Admire 200SL) was the most effective application methods.
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
ENTOMOLOGY
SEMESTER: JULY-DECEMBER, 2009
