Abstract:
A field experiment on management of sclerotium root rot disease of sugarbeet was
conducted in the central farm of Sher-e-Bangla Agricultural University, Dhaka during
November, 2019 to March, 2020. The prime aim of the study was to manage the
sclerotium root rot disease of sugarbeet using seven modern phyto- chemicals and bio-
agent, Trichoderma harzianum. BSRI released tropical sugarbeet line HI 0044 was used
as a planting material and seven modern phyto-chemicals viz., Amister Top 325 SC,
Acibin, Tilt 250 EC, Ridomil Gold, Dithane M-45, Cabrio Top, Autostin were used in
the experiment as a codified treatments. The sugarbeet was grown for sugar production
and natural inoculums were relied upon for the infection of sclerotium root rot. Growth
parameters, yield attributes and physiological features were significantly affected by
the application of selected modern phyto-chemicals and bio- agent. Percent disease
incidence and severity of sclerotium root rot was varied among the treatments. The
lowest disease incidence (16.67, 13.89 and 16.67%) was found in Amister Top 325 SC,
Acibin and Tilt 250 EC treated plots. The highest disease incidence (56.94%) was found
in control treatment. The lowest disease severity (4.63, 4.63 and 5.40%) was found in
Amister Top 325 SC, Acibin and Tilt 250 EC treated plots. The highest disease severity
(14.20, 13.43 and 11.57%) was found in control treatment, Autostin and Dithane M-45
treated plots. Although the Acibin and Tilt 250 EC showed the better performance
regarding the percent disease incidence and severity, but other considering parameters
were not found at satisfactory level in Acibin and Tilt 250 EC treated plots due to the
chemical effects. Plants were severely affected and showed the stunted and shrinked
symptoms. The highest individual beet diameter, weight and yield per plot was obtained
in Amister Top 325 SC, Dithane M-45, Cabrio Top and Autostin treated plots (41 cm,
1.02 kg, 24.40 kg; 32.28 cm, 0.78 kg, 18.80 kg; 33.38 cm, 0.85 kg, 20.40 kg and 32.58
cm, 0.85 kg, 20.40 kg respectively). The lowest individual beet diameter (19.75 cm),
weight (0.51 kg) and yield per plot (12.16 kg) was obtained in control treatment. The
highest brix (%) and sucrose/pol (%) was also measured in Amister Top 325 SC,
Dithane M-45 and Cabrio Top treated plots (17.8 %, 12.7%; 16.9%, 12.62% and 16.9%,
12.62% respectively). The lowest brix (11.5%) and sucrose/pol (6.53%) was obtained
in control treatment. However, from the findings of the study, it may be concluded that
among the selected phyto- chemicals, Amister Top 325 SC and Cabrio Top showed the
promising performance for management of sclerotium root rot disease of sugarbeet and
gave better yield and yield attributes. On the other hand, bio- agent Trichoderma
harzianum showed non-satisfactory results regarding the all considering parameters.
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