Abstract:
A field experiment was carried out at research farm of Sher-e-Bangla Agricultural
University to find out the effect of intercropping on the insect pest infestation of cabbage.
The crop combinations were cabbage ± garlic, cabbage + radhuni. cabbage + mouri,
cabbage + methi. cabbage + kalizira, cabbage + coriander. cabbage + onion and sole
cabbage. The experiment was laid out in a Randomized Complete Block Design
(RCBD) with three replications. The lowest number of insect pest (0.03. 0.12,
0.32, 0.60,1.20, 1.59, 2.15, 2.41 and 3.00 at 15, 22, 29. 36, 43, 50, 57. 64 and 71
DAT, respectively) and highest infestation reduction over control (97.89, 92.281
83.08, 75.68, 66.40, 62.61, 56.20, 54.75 and 55.40 at 15, 22, 29, 36, 43, 50. 57, 64
and 71 DAT, respectively), The highest number of natural enemy (0.98, 1.41. 1.75
and 2.18 at 50, 57. 64 and 71 DAT, respectively), lowest number of insect pest
family (2.21) and highest reduction over control (69.07%). The highest number
of natural enemies (2.85) and The highest increase over control (64.29%) were
achieved by Cabbage + garlic intercropping system. The highest cabbage yield
(63.29 riha). relative yield (1.08 t/ha) and cabbage equivalent yield (63.50 t/ha)
were obtained in Cabbage + garlic intercropping system. The highest gross return
(Tk. 305160.00/ha) was recorded from the Cabbage + garlic intercropping system.
Considering the results of the present study, cabbage + garlic intercropping
system showed the best performance in respect of reducing insect pest and
increasing natural enemies, relative yield, cabbage equivalent yield and gross
return.
Description:
A thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University. Dhaka
in partial ftulIillrnent oldie requirements
for the degree of
MASTER OF SCIENCE
IN
ENTOMOLOGY
SEMESTER: JULY-DECEMBER, 2010
