Abstract:
An experiment was conducted at Sher-e-Bangla Agricultural University, Farm Dhaka,
Bangladesh to study the ecofriendly management of thrips infesting mung bean, during
March to June 2022 in Kharif season. The experiment was laid out in Randomized
Complete Block Design (RCBD) with twelve treatments i.e. T
ii
1
: Blue sticky trap, T
:
White sticky trap, T
3
: Ecomec 1.8 EC (Abamectin) @ 1ml L
-1
of water, T
: Tracer
45SC (Spinosad) @ 0.5ml L
-1
of water, T
5
: Biotrin 0.5% AS (Matrin) @ 1.4 ml L
of
water, T
6
: Blue sticky trap + Ecomec 1.8 EC @ 1ml L
-1
of water, T
: Blue sticky trap
+ Tracer 45SC (Spinosad) @ 0.5ml L
-1
of water, T
8
7
: Blue sticky trap + Biotrin 0.5%
AS @ 1.4 ml L
-1
of water, T
9
: White sticky trap + Ecomec 1.8 EC @ 1ml L
of water,
T
10
: White sticky trap + Tracer 45SC (Spinosad) @ 0.5ml L
-1
of water, T
: White
sticky trap + Biotrin 0.5% AS @ 1.4 ml L
-1
of water and T
: Untreated (Control).
Thrips infestation in mung bean varies significantly among the treatments. Treatment
T
6
(blue sticky trap + ecomec 1.8 EC @ 1ml L
-1
12
of water) contributed to the best
control of Megalurothrips usitatus and Thrips palmi, recorded the lowest infestation
percentage of leaves (25.80%) shoots (35.10%), flower buds (13.47%) and flowers
(20.46%). On the other hand, the lowest infestation percentage of leaves, shoots, flower
buds and flower was found in untreated control treatment. The T
treatment gave the
highest value in the number of pods per plant (35.33), pod length (8.13 cm), seeds per
pod (11.78), 1000 seeds weight (48.23 g) and yield (1290.6 kg ha
6
-1
). This treatment,
however, has an impact on net return and marginal benefit cost ratio. It produced the
highest net return (Tk 36165/ha) and marginal benefit cost ratio (2.94) when compared
to other treatments. However, considering yield and benefit, T
7
, T
8
and T
were also
found cost effective for the management of thrips on mung bean.
Description:
A Thesis
Submitted to Department of Entomology,
Faculty of Agriculture.
Sher-e-Bangla Agricultural University,
Dhaka-
In partial fulfillment of the requirements for the degree of
MASTERS OF SCIENCE (MS)
IN
ENTOMOLOGY
