Abstract:
The present experiment was conducted to study the effect of some selected
insecticides and botanicals against insect pests for yield and seed quality of tomato at
the farm of Shcr-e-Bangla Agricultural University, Dhaka during the period from
October 2019 to March 2020. The experiment consisted of 7 treatments viz,T
1
=
Spinosad 45EC @ 0.4 ml/L of water, T
2
= Voliam flexi 300SC @ 0.5 ml/L of water,
T
3
= Bioneemplus 1EC @ 0.5 ml/L of water, T
4
= Proclaim 5SG @ 1.0 g/L of water,
T
5
= Mig 5EC @ 1.0 ml/L of water, T
6
= Admire 20SL @ 0.5 ml/L of water and
Untreated control, applied at 7 days interval through out the cropping season. The
experiment was laid out in Randomized Complete Block Design with three
replications. Among different treatments, T
6
(Admire 20SL) showed the best
performance on the incidence of whitefly, aphid and leaf miner plant
and showed
lowest number (2.97, 4.00 and 1.21, respectively) and gave 72.45%, 80.55% and
72.26% reduction of incidence over control, respectively and regarding borer
infestation of tomato, this treatment also showed highest healthy fruit plant
by
number (25.87) and weight (1.72 kg) compared to untreated control which showed
least performance. Treatment T
6
(Admire 20SL) also showed highest healthy fruit
yield (86.18 t ha
-1
) and maximum 68.81% increase of healthy fruit yield over control
while the lowest infested fruit yield (3.02 t ha
ii
-1
) was obtained with this treatment
which was followed by T
3
(Bioneemplus 1EC) whereas untreated control gave lowest
healthy and the highest infested fruit yield (51.05 and 10.18 t ha
-1
, respectively).The
yield contributing parameters and seed yield of tomato, treatment T
6
(Admire 20SL)
performed the highest plant height (94.29 cm), number of branches plant
(11.25),
number of flower clusters plant
-1
(8.63), number of fruits cluster
-1
(6.37), single fruit
weight (66.64 g), seed weight fruit
-1
(0.57 g), seed weight plant
-1
(12.73 g) and seed
yield (636.70 kg ha
-1
) whereas untreated control treatment showed poorest
performance.In case of seed quality parameters, treatment T
3
(Bioneemplus 1EC)
treated plot showed the highest seed germination (97.23%), root length (3.41 cm),
shoot length (5.25 cm) and seed vigor index (842.70) followed by T
6
(Admire 20SL)
whereas untreated control plot showed the lowest results (83.80%, 1.91 cm, 3.75 cm
and 473.70, respectively). From the above result, it may be concluded that the
treatment T
6
(Admire 20SL) showed the best performance in suppressing whitefly,
aphid and leaf miner plant
-1
which resulted higher healthy fruit yield and seed yield
followed by T
3
-1
(Bioneemplus 1EC). In case of seed quality parameters, T
3
(Bioneemplus 1EC) showed best performance while T
6
(Admire 20SL) showed
comparatively better performance.
Description:
A Thesis
Submitted to the Institute of Seed Technology
Sher-e-Bangla Agricultural University, Dhaka
partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (M.S.)
IN
SEED TECHNOLOGY