Abstract:
The experiment was conducted in the experimental field of Sher-e-Bangla
Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period from
April to August, 2016 to incidence and management of rice yellow stem borer
and rice hispa on rice variety BRRI dhan43. The experiment comprised of the
following control measure as treatment- T1: Marshall 20 EC @ 3.0 ml/L of water
at 7 days interval; T2: Malathion 57 EC @ 2.0 ml/L of water at 7 days interval;
T3: Diazinon 60 EC @ 3.5 ml/L of water at 7 days interval; T4: Furadan 5G @
2.5 g/plot at 7 days interval; T5: Sevin 85 SP @ 3.0 g/plot at 7 days interval;
T6:Cartap 50 WP @ 3 g/L of water at 7 days interval and T7: Untreated control.
Data was recorded on dead heart and white head infestation, incidence of rice
hispa and also yield attributes, yield of BRRI dhan43 and found statistically
significant differences for different treatment. At 40 and 47 DAT, the lowest
dead heart infestation 2.90% and 3.05% recorded in T1 treatment. At 92, 99, 106
and 113 DAT, the lowest white head infestation 3.43%, 6.73%, 4.24% and
4.90% was observed from T1, while the highest white head infestation was
recorded from T7. In vegetative stage, at 40, 47, 54 and 61 DAT, the lowest
number of rice hispa/2 sweeps 1.00, 1.20, 1.11 and 2.22 was observed from T1,
whereas the highest number of rice hispa/2 sweeps was recorded from T7
treatment. In reproductive stage, 92, 99, 106 and 113 DAT, the lowest number of
rice hispa/2 sweeps 1.33, 1.33, 0.67 and no rice hispa/2 sweeps was recorded
from T1, whereas the highest number was recorded from T7 treatment. The
highest yield/hectare (5.67 ton) was recorded from T1, whereas the lowest
yield/hectare (3.35 ton) from T7 treatment. The results of economic analysis of
rice cultivation revealed that the highest benefit cost ratio (2.28) was estimated
for T1 treatment and the lowest (1.03) for T2 treatment under the trial. Among
the different control measures, spraying Marshall 20 EC @ 3.0 ml/L of water at
7 days interval was the better for the of rice yellow stem borer and rice hispa on
rice variety BRRI dhan43.
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 (MS)
IN
ENTOMOLOGY
SEMESTER: JANUARY-JUNE, 2016
