Pathogen. The fungus persists in plant refuse in the soil, on weeds and on other susceptible hosts.
Disease development. Infection occurs when windblown spores germinate on the foliage. Temperatures above 18°C favour disease development.
circles or “pepper spots” on leaves.
the rings of early blight lesions. Brown spot lesions may coalesce to form larger necrotic
areas with dark-brown margins. These necrotic areas usually form near the edges of leaflets.
pressure is very high.
