Abstract:
The experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka,
Bangladesh to study the effect of some promising chemicals and botanicals on the
management of aphid and tobacco cutworm in mustardin mustard during the period from
October 2021 to February 2022 in the Rabi season. The experiment was laid out in
Randomized Complete Block Design (RCBD) with five different treatment viz: T
1
:
Confidor 70WG (imidacloprid) @3g/kg of seed, T
2
: Bioneemplus 1EC (azadirachtin)
@1.0 ml/L of water, T
3
: Neem seed kernel extract (azadirachtin) @50 g/L of water, T
4
:
Tracer 45 SC (spinosad) @0.4 ml/L of water and T
5
: untreated control, for the
management of aphid and tobacco cutworm of mustard with three replications for each
treatment. Data on different parameters were recorded and significant variation was
observed among different treatment. Experimental result showed that at early, mid and
late stage of flowering and fruiting the highest number of aphid and cutworm was
observed in T
5
treatment while the lowest number of aphid and cutworm was observed in
T
4
treatment. In case of aphid at flowering fruiting stage the maximum number of healthy
plant m
-2
(28 and 24.67) and higher infestation reduction percentage (76.92 and 72.78 %)
was observed in T
4
treatment. In the case of tobacco cutworm at the flowering and
fruiting stages, the highest number of healthy plants per square meter (29.33 and 28.00)
and the highest infestation reduction percentage (87.64and 76.92 %) was found in the T
4
treatment. In case of growth, yield contributing characters and yield of mustard, among
different treatments the maximum plant height (106.35 cm), number branches plant
(16.02), siliqua plant
-1
(105.10), siliqua length (4.14 cm), seeds siliqua
(26.87), 1000seed
weight
(4.02 g) and higher seed yield (1.77 t ha
-1
-1
) was obtained from T
4
treatment
which gave (84.38 %) more yield comparable to control treatment. Based on the
investigation of the above results, it may be concluded that among seed treating chemical
and few botanicals for controlling mustard aphid and tobacco cutworm, spraying Tracer
45 SC @0.4 ml/L of water at 10-day intervals was the most effective among the
management practices for controlling mustard aphid and tobacco cutworm.
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