Abstract:
An experiment was conducted at the experimental field of Sher-e-Bangla Agricultural
University (SAU), Sher-e Bangla Nagar, Dhaka, to evaluate of some botanicals and
chemical insecticides for the management of brinjal shoot and fruit borer (Leucinodes
orbonalis Guenee.) during October, 2009 to April, 2010. The experiment comprised
seven (7) treatments viz. (i) T1= Application of Mehogoni oil @ 5ml/L of water, (ii)
T2 = Application of Mehogoni oil @ 3ml/L of water, (iii) T3 = Application of Neem
oil @ 5ml/L of water, (iv) T4= Application of Neem oil @ 3ml/L of water, (v) T5=
Application of Marshal 20 EC @ 2ml/L of water, (vi) T6= Application of Ripcord 10
EC @ 1ml/L of water and (vii) T7= Untreated control. Each application was done at
28 days after transplanting and repeated at 7days interval. The experiment was set up
in Randomized Complete Block Design with three replications. Data on different
growth and yield parameters were recorded and analyzed statistically. Results under
the present experiment represented that the lowest shoot infestation (3.82%), lowest
fruit infestation by number (12.29%) and by weight (8.73%), maximum total fruit
yield (31.89 t/ha), lowest infested fruit yield (2.78 t/ha), highest healthy fruit yield
(29.11 t/ha), highest fruit length (28.03cm), girth of fruit (12.82cm) and weight of
edible portion of infested fruit (152.36 g), highest adjusted net return (Tk. 402540.00)
and highest BCR (11.45) were achieved by Marshal 20EC @ 2ml/L of water at 28
days after transplanting and repeated 7 days interval (T5) compared to all other
treatments. The highest percent reduction of shoot infestation (72.18%), the highest
percent (%) reduction of fruit infestation by number (62.02%) and by weight
(72.12%), percent (%) increase of total yield (58.03%), maximum reduction of
infested fruit yield (72.14%), maximum increase of healthy fruit yield (185.39%),
highest percent (%) increase of fruit length (18.57%), girth of fruit (27.69%) and
weight of edible portion per infested fruit (129.67%) over control were also achieved
by Marshal 20EC @ 2ml/L of water at 28 days after transplanting and repeated 7 days
interval (T5). Thus it is said that among the treatments T5 (Application of Marshal 20
EC @ 2ml/L of water after water 28 days after transplanting and repeated at 7days
interval) showed the best performance for controlling brinjal shoot and fruit borer.
Description:
Athesis
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
SEMISTER: JANUARY-JUNE, 2010