Abstract:
Potato, Solanum tuberosum L. is the king of vegetables in Bangladesh. Potato is a prominent
crop in consideration of production and its internal demand in Bangladesh. An experiment was
conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka,Bangladesh
during the period from October, 2020 to September,2021 study the effect of different insecticides
in controlling potato insects. The experiment was laid out in Randomized Complete Block
Design replicated with three times. For this study, seven treatment combinations like T
1
=
Spraying Neem oil @5ml/L of water; T
2
= Spraying Neem seed kernel extract @5g/L of water;
T
3
= Spraying Spinosad @0.5ml/L of water; T
4
= Buprofezin 40wp @0.5g/L; T
5
= Emamectin
Benzoate 1ml/L; T
6
= Matrin @1ml/L and T
7
= Untreated control. Neem oil (T
1
) showed the best
performance in terms of insect incidence of aphid, cutworm and field cricket, potato tuber
infestation by number and weight and yield (2.54 aphid/5 tagged plants, 0.85 cutworm per plot,
1.61 field cricket per plot, 18.88%, 5.79% and 48.76 t/ha, respectively). In case of Jassid
infestation Emamectin Benzoate (T
5
) showed the best performance 1.82 Jassid/5 tagged plants.
The natural enemy ladybird beetle was found high in T
1
applied field (4.18 ladybird beetle/5
tagged plants). So, from this study it can be revealed that, neem oil can play an important role in
reducing the incidence of insect pests of potato as well as increase the incidence of natural
enemies and yield of potato in the field condition.
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
