Abstract:
The experiment was conducted in the central farm of Sher-e-Bangla Agricultural University
(SAU), Sher-e-Bangla Nagar, Dhaka-1207 during the period from February to September,
2013 to evaluate promising insecticides in comparison with conventional insecticides for
management of brinjal shoot and fruit borer (BSFB), Leucinodes orbonalis Guenee and their
impact on natural enemies. The experiment was laid out in a Randomized Complete Block
Design (RCBD) with three replications and six treatments applied at 7 days interval. The
treatments were T1 (Acimix @ 1ml/L of water); T2 (Calipso @ 1ml/L of water); T3 (Neem oil
@ 3mml/L of water); T4 (Neem Seed Karnel Extract @ 100g/L of water); T5 (Nexaid @
1.5ml/L of water); T6 (Untreated Control). The result reveled that amongst newer insecticides
Acimix @ 1ml/L of water was most effective in reducing shoot infestation (66.72%) and
Calipso @ 1ml/L of water was found most effective in reducing fruit infestation by number
and weight (68.56 and 61.04%), over control followed (66.56, 53.7% respectively) by
Acimix, whereas Neem Seed Kernel Extract @100gm/L of water from the field showed the
least performance (19.40 and 9.17%, respectively). The best treatment, though, T1 and T2
reduced the highest level of shoot and fruit infestation respectively, they increased the
maximum level of plant and fruit related yield attributes. T2 increased the maximum height,
number of branch per plant, fruit length and girth, number of fruit per plant, and single fruit
weight (27.06, 36.50, 43.40, 55.91, 68.41 and 61.04%, respectively) of eggplant over control
followed by Acimix (13.33, 33.46, 33.95, 39.00, 66.56 and 53.7%, respectively), whereas
Neem Seed Kernel Extract @ 100g/L of water showed the least performance. Calipso also
increased the highest fruit yield (15.360 t/ha) over control (14.860 t/ha) followed by Acimix
(40.987%). Considering the impact of management practices on the population of natural
enemy, Calipso had adversely affected and reduced the highest population of adult and larvae
of ladybird beetle, and field ant (81.34, 72.42 and 63.18% respectively) over control followed
by Acimix (67.81, 52.99, and 52.21%, respectively), whereas Neem Seed Kernel Extract
performed as the least hazardous treatment. Though, Calipso reduced the highest level of
BSFB infestation followed by Acimix, conversely they mostly harmful to the arthropod
biodiversity in the brinjal ecosystem by reducing the maximum level of the natural enemy
population than any other newer insecticides which were comparatively safe , and would be
fit well into the management of brinjal shoot and fruit borer (BSFB).
Description:
A Thesis
Submitted to the Department of Entomology, 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: JULY-DECEMBER, 2013