Abstract:
Okra black leaf spot disease is a major disease of strode okra which is caused
by Cercospora abelmusachi. A fungus that belongs to the division Dothideomycetidae.
To find suitable fungicides against black leaf spot pathogen was carried out in the
laboratory of the Department of Biosystems Technology, Faculty of Technology, Eastern
University, Sri Lanka. In the first experiment okra black leaf spot pathogen was isolated
from the infected leaves and was cultured on potato dextrose agar (PDA) media.
In the second experiment, different fungicides were applied to the PDA culture Media.
Mancozeb 80% WP (0.4g/200ml), Thiram 80% WP (0.25g/200ml), Homai (thiophanate
methyl 50%, thiram 30%) (0.2g/200ml) and Sulfur 80% (1g/200ml) were taken as the
treatments of this experiment with PDA without fungicide as the control. The experiment
was laid out in a Completely Randomized Design with five treatments and four replicates.
The results revealed that Mancozeb and Homai fungicides completely inhibited the colony
growth of the pathogen in vitro. Therefore, it was concluded from this experiment that the
fungicides mancozeb and homai are effective in the control of okra black leaf spot fungus
under in vitro conditions.
