Infection occurs at optimum temperatures with 5.5 hours of wetting, and an outbreak can become serious within two days of infection. The fungus attacks susceptible cultivars using a chemical toxin. Affected plants exhibit circular spots on the leaves that enlarge as the disease advances.
Infection occurs at optimal temperatures with 5.5 hours of moisture exposure, and an epidemic can become severe within two days of infection. The fungus attacks vulnerable cultivars using a toxic substance. Affected plants display circular spots on the leaves that enlarge as the disease progresses.