Abstract:
The experiment was conducted in the field of Sher-e-Bangla Agricultural
University, Sher-e-Bangla Nagar, Dhaka, Bangladesh during the period from
November 2012 to March 2013 to study the management of mustard aphid,
Lipaphis erysimi (kalt.) using botanicals. Seeds of BARI Sarisa-15 were used as a
test crop for this experiment. The experiment comprised of the treatments T1:
Neem seed karnel extract 5% at 7 days interval, T2: Tobacco leaf dusts @ 20 g/L
of water at 7 days interval, T3: Neem oil @ 0.3% at 7 days interval, T4: Sumi
Alpha 5EC @ 1ml/L of water at 7 days interval, T5: (Neem seed karnel extract 5%
+ Sumi Alpha 5EC @ 1ml/L of water) at 7 days interval, T6: (Tobacco leaf dusts
@ 20 g/L of water + Sumi Alpha 5EC @ 1ml/L of water) at 7 days interval, T7:
(Neem oil @ 0.3% + Sumi Alpha 5EC @ 1ml/L of water) at 7 days interval and
T8: untreated control. The experiment was laid out in Randomized Complete
Block Design (RCBD) with three replications. In case of aphid population, at the
total flowering stage, the lowest number of aphid (2.19) was recorded from T7 and
the highest number (30.00) from T8. At the total fruiting stage, the lowest number
of aphid (4.64) was recorded from T7, while the highest number (31.40) from T8.
At early flowering stage, the highest infested plant/m2 (15.56%) was attained in T8
treatment again, the lowest (1.11%) in T7. At mid flowering stage, the highest
infested plant/m2 (17.78%) was observed in T8 treatment and the lowest infested
plant/m2 (2.22%) in T7. At late flowering stage, the highest infested plant/m2
(21.11%) was recorded in T8 treatment, whereas the lowest infested plant/m2
(3.33%) was recorded in T7.At early fruiting stage the highest infested plant/m2
(18.89%) was recorded in T8 treatment, while the lowest (4.44%) in T7. At mid
fruiting stage, the infested plant/m2 (22.22%) was attained in T8 treatment,
whereas the lowest (5.56%) in T7. At late fruiting stage, the highest infested
plant/m2 (24.44%) was found in T8 treatment and the lowest (6.67%) in T7.The
highest seeds yield per hectare (2.45 ton) was recorded in T7, whereas the lowest
(2.02 ton) was found in T8 treatment. Neem oil @ 0.3% + Sumi Alpha 5EC @
1ml/L of water at 7 days interval was more effective among the management
practices for controlling mustard aphid.
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: JANUARY-JUNE, 2013