Abstract:
The experiment was conducted at the experimental field of Sher-e-Bangla
Agricultural University, Dhaka during the Kharif season from April, 2012 to
August, 2012 to study on evaluation of some chemical and botanical
management practices in controlling major insect pests of soybean. The
experiment comprised with six different insecticides and botanicals including
control treatment viz. T1: Neem oil @ 3ml/L of water mixed with trix@10ml/L
of water at 15 days interval, T2: Ripcord 10EC @ 2ml/L of water, T3: Aktara 25
WG @ 0.3 mg/L of water, T4: Sumialfa 5EC @ 2ml/L of water, T5: Marshal
20EC@ 2ml/L of water, T6: Control treatment; were used as treatments.
Incidence of major pest of soybean var. Shohag was the main purpose of this
study and their control with applied some chemicals pesticides as treatments.
The experiment was laid out in Randomized Complete Block Design (RCBD)
single factor with three replications. Among the major pests of soybean,
maximum number of Whitefly, jassid, pod borer and leaf roller were effective
than other pests on soybean research field. However, Sumialfa 5EC @ 2ml/L
of water was supplementary efficient as well as the more reduction of major
pests were recorded at different days after sowing. The maximum numbers of
leaves, number of branches, maximum leaf length, number of flowers,
minimum number of infested pod, maximum number of healthy pod per plant,
were found from the treatment Sumialfa 5EC @ 2ml/L of water. Similar
treatment also produced the yield plot-1 (3.29 kg) and yield per hectare (3.65
t/ha) of soybean. The highest benefit cost ratio (6.00) was obtained in Sumialfa
5EC @ 2ml/L of water the treated plot. Those results indicate that the Sumialfa
5EC @ 2ml/L of water showed the best performance to manage the major pests
of soybean as well as on growth and yield among the all applied insecticide in
this study. I also found the lady bird beetle as predator from my experimental
field.
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
