Abstract:
An experiment was conducted in the experimental field of Sher-e-Bangla Agricultural
University, Dhaka, Bangladesh during the period from October, 2021 to March 2022 to evaluate
the effect of micronutrients on incidence, damage severity of insect pests of sunflower and its
impact on yield and beneficial arthropods. The experiment was laid out in Randomized Complete
Block Design replicated with three times. For this study, T
ii
1
= Boron @ 8.0 kg/ ha + ZnSO
@ 9.6
kg/ ha; T
2
= Spraying 0.2% Borax @ 2g/L of water; T
3
= Spraying 0.2% ZnSO
@ 2g/L of water;
T
4
= Spraying 0.5% Borax @ 2g/L of water; T
5
4
= Spraying 0.2% Borax and 0.2% ZnSO
@ 2g/L
of water; T
6
= Spraying 0.5% ZnSO
4
@ 2g/L of water; T
7
= MnSO
4
@ 9 kg/ ha; T
= No
micronutrient (control). The maximum plant height (180.2 cm), leaf area (65.44 cm
), capitulum
diameter (12.04 cm), diameter of flower with petal (22.33 cm), number of petal (45.34), number
of calex (59.33), number of seed per head (1015), weight of seeds per head (85.26 g), weight of
total seed per plot (2.56 kg), weight of single seed (0.084 g), yield (2.92 t/ha), oil content (46.54
%), protein content (22.38 %), seed vigourity (78.52%) and seed viability (91.67%) were
observed from T
treatment. Again, the minimum number of whitefly per plant at reproductive
stage (9.67 whitefly), jassid per plant at vegetative stage (6.67 jassid), aphid per plant at ripening
stage (5.33 aphid), stink bug per plant (0.24 stink bug), number of infested leaves (2.89 leaves)
and percent leaf infestation (12.46 %) were also observed from T
5
treatment. In case of
beneficial arthropod, the maximum number of syrphid fly per plot (1.50 syrphid fly), honey bee
per plot (3.33 honey bee), lady bird beetle per plot (2.50 lady bird beetle) and ant per plot (1.67
ant per plot) were observed from T
5
treatment.
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
