Abstract:
This study was conducted to investigate the effect of varieties of mustard and
chemical insecticideson the infestation of mustard aphid Lipaphiserysimi (Kalt)
during the period from November 2012 to February 2013 at the Sher-e-Bangla
Agricultural University farm, Dhaka.The study consisted of five treatments and two
varieties.These were as follows:T1: (Spraying of Dursban 25EC @ 2.5ml/L of
water),T2:(Spraying of Malathion 57EC @ 2.5ml/L of water), T3: (Spraying ofSumi-
Alpha 5EC@ 1ml/L of water), T4: Spraying of Sevin 85 SP @ 2.5g/L of water and T5:
(Untreated Control) treatment and all the spraying were done at 15 days interval. Two
varieties were BARI shorisha-9 and BARI shorisha-11.The experiment was laid out in
a Randomized Complete Block Design (RCBD) with three replications. The result
revealed that among the treatment combinations, T3V2 (Sumi-Alpha + BARI shorisha-
11) was the most effective in controlling mustard aphid (85.78%) after first spray and
(88.11%) after second spray. On the other hand T4V2(Sevin + BARI shorisha-11) was
less effective in controlling mustard aphid(71.45%) after first spray and (67.11%)
reduction of aphid population after second spray. The combination of Sumi-Alpha and
BARI shorisha-11 was better in terms of controlling mustard aphid L. erysimi and
yield of mustard.
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: January-June, 2014
