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 takes place at optimal temperatures with 5.5 hours of wetting, and an epidemic can become severe within two days of infection. The fungus assaults vulnerable cultivars using a chemical poison. Affected plants display circular spots on the leaves that expand as the disease progresses.