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STUDY ON THE BIOLOGY OF MEALYBUG INFESTING BRINJAL AND ITS CHEMICAL CONTROL

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Title STUDY ON THE BIOLOGY OF MEALYBUG INFESTING BRINJAL AND ITS CHEMICAL CONTROL
 
Creator SAHA, SWAKKOR
 
Subject INFESTING BRINJAL AND ITS CHEMICAL CONTROL
 
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
SEMESTER: JULY-DECEMBER, 2014
The experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Shere-
Bangla Nagar, Dhaka to evaluate the biology of mealybug and effect of some chemical
insecticides on mealybug attacking brinjal in the field during the period from June, 2014 to
October, 2014. Mean developmental periods of 1
st
, 2
nd
, 3
rd
, instar nymphs and adults were
5.6, 8.4, 9.8 and 12 days respectively. Six insecticides were applied in replicated brinjal
field. The treatments were T1: T-mectin 1.8 EC (Abamectin) @ 2.0 ml/L of water at 7 days
interval; T2: Fighter 2.5 EC (Lambda cyhalothrin @ 1.0 ml/L of water at 7 days interval);
T3: Voliam flexi (Thiamethoxam + Chlorantraniliprole @ 1.0 ml/L of water at 7 days
interval); T4: Sevin 85 WP (Carbaryl @ 2.0 g/L of water at 7 days interval); T5: Dursban
20 EC (Chlorpyriphos @ 2.5 ml/L of water at 7 days interval); T6 : Admire 200SL
(Imidachloprid @ 1.0 ml/L of water at 7 days interval); and T7 (untreated control). The
result revealed that treatment T5 (Dursban @ 2.5ml/L of water) treatment was the most
effective for reducing mealybug 90.22, 67.37, 64.22 and 83.84 respectively from leaf, twig,
flower and fruits. The treatment T3 showed 77.17, 56.84, 45.87 and 56.57 respectively for
reduction of these insect pests from those plant parts and T6 had the least performance over
control. Dursban was also most effective insecticide for increasing fruit number and weight
per fruit 205.83 and 41.23% respectively and in T6 it was 50 and 11.57% respectively. In
terms of yield Dursban treatment was most effective increasing yield (130.23%) followed
by T3(100.2%) and T1 (63.66%) treated plot. The application of Dursban at 7 days
intervals was the best effective treatment for the control of mealybug pests in the brinjal
field.
 
Date 2018-11-26T10:47:35Z
2018-11-26T10:47:35Z
2014-12
 
Type Thesis
 
Identifier http://archive.saulibrary.edu.bd:8080/xmlui/handle/123456789/1498
 
Language en
 
Format application/pdf
 
Publisher DEPARTMENT OF ENTOMOLOGY, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA.