Abstract:
An experiment was conducted at the research field of Sher-e-Bangla
Agricultural University (SAU), Dhaka-1207 during the period from November
2011 to June 2012 to evaluate the performance of some plant extracts for the
management of brinjal shoot and fruit borer, (Leucinodes orbonalis Guenee).
Experiment comprised 8 treatments including a control viz., T1: Tamarind fruit
extract @ 50 g L-1 water, T2: Morning glory leaf extract @ 50 g L-1 water, T3:
Bullok’s heart leaf extract @ 50 g L-1 water, T4: Neem leaf extract @ 50 g L-1
water, T5: Tobacco leaf extract @ 50 g L-1 water, T6: Mahogony seed extract @
50 g L-1 water, T7: Aktara 25 WG @ 0.5 g L-1 and T8: Control. The experiment
was laid out in Randomized Complete Block Design (RCBD) with three
replications. Neem leaf extract @ 50 g L-1 water (T4) produced the highest
number of total shoots (16.00 plant-1), healthy shoots (15.67 plant-1), total fruits
(25.33 plant-1), healthy fruits (23.00 plant-1), total fruits weight (2.711 kg plant-1),
healthy fruit weight (2.645 kg plant-1) and fruits yield (36.15 t ha-1). Lower
number of infested shoot and fruits (0.33 and 2.33 plant-1, respectively) and
percentage (2.223 and 9.303%, respectively) were also found in neem leaf
extract @ 50 g L-1 water (T4), and infested fruits weight as well as its percentage
was also lower (0.250 kg plant-1 and 9.303% respectively) in the same treatment.
In contrast, per cent protection of shoot and fruit borer over control was higher
(92.45 and 91.26%, respectively) and fruit yield increase over control was also
higher (61.74%) in this treatment. Control treatment performed poorly in all
parameters. These results concluded that the use of neem leaf extract @ 50 g L1
water would be highly effective to reduce the shoot and fruit infestation as
well as to get higher yield of brinjal.
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