Abstract:
The experiment was conducted to standardize the hot water in controlling major
seed borne pathogens of selected vegetables during the period from September
2017 to March 2018, in the central laboratory of the Department of Plant
Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207. Effect of
dipping seed in hot water at 50 to 60 °C for 5 minutes against seed borne
microflora were explored to standardize the temperature and time in controlling
seed borne pathogens of bitter gourd, pumpkin, bottle gourd, cucumber,
eggplant, chilli, tomato, lady´s fingers, radish and country bean seeds. The
treatments were T
0
T
3
T
6
= Control, T
1
= 54 ºC for 5 minutes, T
4
= 50 ºC for 5 minutes, T
2
=56 ºC for 5 minutes, T
5
= 52 ºC for 5 minutes,
= 58 ºC for 5 minutes and
= 60 ºC for 5 minutes. Data were collected on % seed germination, % seed
infection, % rotten seed and % dead seed. The experiments were conducted
following Completely Randomized Design (CRD) and analyzed by computer
package MSTAT-C. Significant differences were found in all the parameters.
The highest seed germination in all the vegetables were recorded at the treatment
where seeds were treated at 54 °C to 58°C for 5 minutes and the lowest were
obtained at control. The lowest rotten seed of all the vegetables recorded in 60
°C and the highest rotten seeds obtained at T
0
(control). The highest dead seed of
studied vegetables were recorded in T
6
(60 °C for 5 minutes) and the lowest were
obtained at T
0
(control). The lowest infected seed of studied vegetables were
recorded in treatment T
6
(60 °C for 5 minutes) and the highest infected seeds
were obtained at T
0
(control). In most cases Chaetomium sp., Aspergillus spp.,
Penicillium spp., and Fusarium spp. etc were prevalent in the seed samples. So,
hot water seed treatment with 54 °C to 58°C for 5 minutes could be suggested as
safe, pollution free and environmental friendly for management of seed borne
pathogens of selected vegetables.
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
