University of Maryland Extension

Anthracnose - Vegetables

pepper with anthracnose
Back to Common Problems - Vegetables

Sunken, dark spots can be caused by more than a dozen species of Colletotrichum, the fungal disease known as anthracnose. Affected crops include pepper (see above photo), bean, tomato, eggplant, cucumber, muskmelon, watermelon, pumpkin, spinach, and pea. Sunken black lesions develop that may be covered with salmon colored spores under wet, humid conditions. On tomatoes, the soft sunken lesions develop dark centers. The fungus overwinters in seeds, soil, and plant residue.

Management: Lay a mulch of shredded leaves, dried grass clippings, or newspaper covered with straw under plants. Pick fruits regularly and quickly remove infected fruits. Avoid contact between soil and fruit. Avoid overhead watering during humid, cloudy weather. Remove all plant residue at the end of the growing season. Infected plant residues can be composted at sustained high temperatures- greater than 120° F. Otherwise, residues should be bagged up and discarded as garbage.

Photo Gallery:

lima beans with anthracnose
Symptoms on lima bean pods

anthracnose infected pumpkin
Close-up on pumpkin

infected spinach
Symptoms on spinach

soft sunken spots on ripe tomatoes
On tomatoes, the soft sunken lesions 
develop dark centers

advanced sypmtoms on tomatoes
Advanced anthracnose on tomatoes

watermelon rind infected with anthracnose
Symptoms on watermelon fruit

Maintained by the IET Department of the College of Agriculture and Natural Resources. © 2017. Web Accessibility