Abstract:
A field experiment was conducted to study the management of major insect pests of
groundnut using botanicals and some selected chemical insecticides. BARI Chinabadam8
was used as the test crop for the experiment. Seven treatments were applied viz. T
1
(Imidacloprid 70FS @ 5 ml/kg), T
2
ii
(Acephate 75SP @ 0.05%), T
3
(Fipronil 5SC @
0.01%), T
4
(Thiamethoxam 25WG @0.4 ml/L at 30 DAS), T
5
(Neem seed kernel extract
@ 5% at 30 DAS), T
6
(Azadirachtin @ 2 ml/L at 30 DAS) and T
7
= Neem leaf extract @
2.5%. Major insect pests namely aphid, whitefly and thrips were found in the study field.
Treatment T
5
(Neem seed kernel extract @ 5% at 30 DAS) showed best performance in
reducing aphid and whitefly population and also their infestation whereas T
7
(Neem leaf
extract @ 2.5%) showed best performance in reducing thrips. Highest healthy shoot and
lowest percent of infestation was also recorded from the treatment T
5
(Neem seed kernel
extract @ 5% at 30 DAS) followed by T
7
(Neem leaf extract @ 2.5%) whereas least
performance was observed from the treatment T
3
(Fipronil 5SC @ 0.01%). Treatment T
5
(Neem seed kernel extract @ 5% at 30 DAS) also showed the best results on growth,
yield and yield contributing characteristics viz. maximum plant height (45.27 cm),
number of branches plant
-1
(9.63), number of pods plant
-1
(18.75), number of seeds pod
(1.72), 100 seed weight (49.24 g), pod yield plot
-1
(1.37 kg) and pod yield ha
(2.37 t)
whereas the lowest pod yield ha
-1
(1.97 t) was obtained from the treatment T
3
(Fipronil
5SC @ 0.01%). In case of quality of seeds after harvest, T
5
(Neem seed kernel extract @
5% at 30 DAS) treated plot gave best performance and showed maximum seed
germination (92.40%), shoot length (7.14 cm), root length (6.72 cm) and seed vigour
index (1281.00) whereas T
3
(Fipronil 5SC @ 0.01%) showed least performance. So, it
can be concluded that among all the treatments, T
5
(Neem seed kernel extract @ 5% at 30
DAS) was best for controlling insect pest of groundnut which resulted maximum yield
and seed quality followed by the treatment T
7
-1
(Neem leaf extract @ 2.5%) whereas T
3
(Fipronil 5SC @ 0.01%) treatment showed lowest performance.
Description:
A Thesis
Submitted to the Institute of Seed Technology,
Sher-e-Bangla Agricultural University, Dhaka,
In Partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
SEED TECHNOLOGY