Abstract:
An experiment was conducted in the Department of Plant Pathology at Sher-eBangla
Agricultural University (SAU), Dhaka-1207, Bangladesh; during
November 2015 to May 2016 to find out the management options of late blight of
tomato through selected botanicals and chemical fungicides. The hybrid variety of
tomato named Rio grand was used for the present study. The experiment was
conducted with 8 treatments viz. T
1
(Mahogany seed extract @ 1:6 w/v), T
(Neem
leaf extract @ 1:3 w/v), T
3
(Papaya leaf extract @ 1:3 w/v), T
(Marigold leaf
extract @ 1:3 w/v), T
5
(Ridomil Gold @ 0.2%), T
6
4
(Topgan @ 0.7%), T
(Dithane
M 45 @ 0.45%), and T
(Control). The experiment was carried out at Randomized
Complete Block Design (RCBD) with three replications. Ridomil Gold @ 0.2%
resulted promising performances in reducing disease incidence (85.98%) and
disease severity (82.82%) of late blight of tomato over control. Ridomil Gold
showed the highest plant height (127.80 cm), number of branches plant
8
(15.72),
number of fruits plant
-1
(34.56), fruit yield plant
-1
7
-1
2
(3.41 kg) and fruit yield ha
(72.84 t) compared to control. Among the botanicals assayed in the experiment,
-1Neem leaf extract @ 1:3 w/v showed effective control against late blight of
tomato. Considering the performances of plant extracts and chemical fungicides
evaluated in the experiment, Ridomil Gold (0.2%) as chemical fungicide and
Neem leaf extracts as botanical could be suggested for the growers for
management of late blight of tomato.
Description:
A Thesis
Submitted to the Department of Plant Pathology
Sher-e-Bangla Agricultural University, Dhaka
In partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (MS)
IN
PLANT PATHOLOGY
SEMESTER: JANUARY- JUNE, 2016
