Abstract:
The in vivo experiment was conducted in the Central Farm of Sher-e-Bangla
Agricultural University (SAU), Dhaka and in vitro experiment was conducted in
the laboratory of the Department of Plant Pathology, SAU. The effect of eight
treatments viz., Tilt 250 EC (Propiconazole), Ridomil gold 68 WG (Mancozeb+
Metalaxyl), Dithane M-45 (Dithiocarbarnate), Score 250 EC (Difenoconazole),
Trichoderma harzianum (Bio-Control), Neem leaf extract (Azadirachta indica)
Allamanda leaf extract (Allamanda cathartica) and a Control (T
0
) were explored
against Anthracnose of chilli (Colletotrichum capsici) during winter season
2019-2020. The efficacy of the treatments varied significantly in terms of disease
incidence, disease severity and yield attributes of chilli. Among the treatments,
Tilt 250 EC, Dithane M-45 showed promising performance against the disease.
The lowest leaf incidence (4.31%) and leaf area diseased - LAD (4.16%) were
recorded Tilt 250 EC. Similarly, the lowest fruit infection (3.93 %) and fruit area
diseased - FAD (3.55%) were recorded in Tilt 250 EC (4.95%) and Dithane M45
(4.41%), respectively. Reduction of disease incidence and severity of
anthracnose of chilli by spraying Tilt 250 EC also reflected in case of fruit yield,
seed yield and subsequent seed health of harvested chilli seed. The highest fruit
yield (10.23 t/ha) and 1000 seed weight (4.21 gm) were also recorded in case of
application of Tilt 250 EC. The maximum seed germination of harvested chilli
seed (87.5%) was also observed in Tilt 250 EC applied plots. Among the plant
extract, neem leaf extract found to give good yield (8.04 t/ha) against
anthracnose disease which was even better than Ridomil Gold 68 WG (7.9 t/ha)
and Score 250 EC (7.67 t/ha).
Description:
A Thesis
Submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka,
In partial fulfillment of the requirements
For the degree of
MASTER OF SCIENCE
IN
PLANT PATHOLOGY
