Abstract:
The study was conducted in the experimental field of Sher-e-Bangla Agricultural
University, Sher-e-Bangla Nagar, Dhaka during the period from April to August,
2017 to evaluate the effectiveness of some biopesticides and chemical pesticides
to manage legume pod borer (Maruca vitrata) on yard long bean. The seeds of
BARI yard long bean-1 were used as the test crop in this experiment. The
experiment comprised of the following bio-pesticides and chemical pesticides as
treatment- T0: Untreated control; T1: Neem oil @ 4 ml/L of water at 7 days
interval; T2: Neem seed kernel @ 30 g/L of water at 7 days interval; T3: Oshtad
10 EC @ 1 ml/L of water at 7 days interval; T4: Voliam Flexi 300 SC @ 0.5
ml/L of water at 7 days interval; T5: Bishkatali leaf extract 4 ml/L of water at 7
days interval and T6: Spinosad 45 SC 1 ml/L of water at 7 days interval. The
experiment was laid out in a Randomized Complete Block Design (RCBD) with
three replications. Recorded data showed statistically significant variation for
different treatments. At early pod development stage, the lowest infested pods
per plant in number and weight basis was observed from T1 (1.26% and 5.33%))
treatment, again the highest infested pods (14.32% and 17.46%) was recorded in
T0 treatment. At mid pod development stage, the lowest infested pods per plant
in number and weight basis was observed from T1 (2.42% and 5.76%) treatment,
whereas the highest infested pods (16.68%and 18.12%) was recorded in T0. At
late pod development stage, the lowest infested pods per plant in number and
weight basis was observed from T1 (3.03% and 6.50%) treatment again the
highest infested pods (17.84% and 19.87%) was recorded in T0 treatment. The
highest yield was recorded from T1 (21.76 t/ha), whereas the lowest yield from
T0 (14.15 t/ha) treatment. The highest benefit cost ratio (2.51) was estimated for
T1 treatment and the lowest (1.26) for T4 treatment. Among the different control
measures, spraying of Neem oil @ 4 ml/L of water at 7 days interval was the
better for the controlling pod borer of yard long bean.
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 (MS)
IN
ENTOMOLOGY
SEMESTER: JANUARY-JUNE, 2017
