How to Manage Pests
Pests in Gardens and Landscapes
Black mold on tomato—Alternaria alternata
Black mold is characterized by obvious lesions that appear on the surface of ripe fruit. Lesions are
light to dark brown and vary from small flecks affecting only epidermal tissue to large, more or less
circular, sunken lesions. During warm, humid weather the fungus may sporulate to form a black, velvetlike
layer on the surface of the sunken lesions.
Black mold is favored by wet conditions and high humidity. Avoid overhead sprinklers late in the season
and keep beds dry. Pick fruit as soon as it ripens. Some varieties may show resistance.
lesions of black mold on tomatoes