Abstract:
The study was conducted in the experimental field of SAU, Dhaka during the period
from October, 2019 to February, 2020 to find out the damage and management of
insect and mite pests on chilli. The experiment was laid out in Randomized Complete
Block Design with three replications. For this study, treatments T
: Spraying Confidor
2G @ 0.2g/L of water at 7 days intervals; T
2
1
: Spraying Actara 25WG @ 0.05g/L of
water at 7 days intervals; T
: Spraying Ethion 46.5EC @ 3ml/L of water at 7 days
intervals; T
4
3
: Spraying Omite 57EC @ 2ml/L of water at 7 days intervals; T
:
Spraying Neem Oil @ 3ml/L of water mixing with 10ml/10gm detergent or trix at 7
days intervals; T
: Spraying Bioneem Plus 1EC @ 1ml/L of water at 7 days intervals
and T
7
6
: Untreated control where only water were sprayed at 7 days intervals. From
this study T
showed the best performance in terms of number of aphids, thrips, gram
pod borer, tobacco caterpillar, and mites (0.53 aphids, 1.04 thrips, 1.19 gram pod
borer, 0.60 tobacco caterpillar and 0.81 mites, respectively). T
3
decreases the number
of insect pests of chili.Beside this, T
3
3
also decreases the number of infested leaves,
aphid infested leaves, thrips infested leaves, mite infested leaves and percent leaf
infestation (102.40 leaves, 97.33 leaves, 87.33 leaves, 78.40 leaves, and 96.42%,
respectively) and increases total number of leaves (106.2 leaves). It also decreases
total number of infested fruits, thrips infested fruits, bored fruits and percent fruit
infestation (9.40 fruits, 8.10 fruits, 2.70 fruits and 7.99%, respectively) whereas it
increases total number of fruits (117.60 fruits). Again it decreases total number of
infested plants and percent plant infestation (3.00 plants and 30.00%, respectively),
whereas it increases the number of branches and plant height (12.47 branches and
67.60 cm, respectively). In case of yield attributing characteristics, T
increases fruit
length, fruit girth, healthy fruit weight, infested fruit weight, total fruit weight/plot and
yield of chilli (6.40 cm, 3.30 cm, 1.41 kg, 0.82 kg, 2.23 kg and 7.43 t/ha,
respectively).
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