Alternaria Stem Canker

Symptoms of Alternaria stem canker appear on stems, leaves, and fruit. Dark brown to black cankers with concentric zonation occur on stems near the soil line or aboveground. Cankers enlarge, girdle the stem before harvest, and kill the plants. Vascular tissue about 2 inches above and below the cankers exhibit brown streaks. Dark brown to black areas ofdead tissuebetween leaf veins are caused by a toxin produced by the fungus. Dark brown sunken lesions with characteristicconcentric ringsdevelop o