Abstract:
An experiment was conducted in the farmer’s field at Rampal, under Munshiganj Sadar Upazila
of Munsiganj, Bangladesh during the period from February’2014 to June’ 2014 to study the ecofriendly
management of okra shoot and fruit borer (Earias vittella Fab.) using botanicals and
chemical. The treatments are comprised with different botanical products, one synthetic
chemical insecticide and one untreated control and these are T1 = Neem leaf extract @
200g/Litre of water sprayed at 7 days interval; T2 = Neem seed karnel extract @200g/Litre of
water at 7days interval; T3 = Neem oil @ 4 ml/Litre of water mixed with 10ml of trix liquid
sprayed at 7 days interval; T4 = Dholkalmi leaf extract @200g/Litre of water at 7 days interval;
T5 = Mahogany leaf extract @200g/Litre of water at 7 days interval; T6 = Suntap 50SP @ 1.5ml/
Litre of water at 7 days interval; T7 = Untreated control. The experiment was laid out in
Randomized Complete Block Design (RCBD) with three replications. The data were recorded on
shoot infestation; fruit infestation by number and weight at early, mid and late fruiting stages;
plant and yield related attributes as well as yield of okra. Among all treatments T6 (Suntap
50SP) showed best performance against okra shoot and fruit borer and reduced the highest
percent of shoot infestation, plant infestation, flower infestation and fruit infestation by number
and weight in early, mid and late stages (85.26, 93.58, 100, 100, 100 percent) over control
throughout the growing period of okra respectively. Among the different botanical products,
Neem oil @ 4 ml/Litre of water mixed with 10ml of trix liquid sprayed at 7 days interval showed
best performance in case of shoot infestation, fruit infestation by number and weight in early,
mid and late stages, plant infestation and flower infestation. Also in case of yield, plots treated
with T3 ( Neem oil @ 4 ml/Litre of water) gave highest products. On the other hand, Dholkalmi
leaf extract @ 200g/Litre of water at 7 days interval showed lowest performance in case of shoot
infestation, plant infestation and flower infestation and also the plots treated with this treatment
showed lowest production of okra. It was revealed from the experiments, T6= Suntap 50SP @
1.5ml/ Litre of water at 7 days interval showed best result and T7= Untreated Control showed
least performance in case of shoot infestation, fruit infestation by number and weight in early,
mid and late stages, plant infestation and flower infestation and Yield. Okra yield was increased
due to increases of number of branches/plant, number of leaf/plant and plant height on the other
hand fruit yield was decreased due to increase of fruit infestation by number and by weight
occurs to okra shoot and fruit borer.
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