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Section 26.5.1: Anthracnose

Colletotrichum graminicola

Time for concern: All season
Key characteristics: Small spots appear on the leaves. These spots may enlarge and become tan in the center with red, reddish brown, or yellowish orange borders. 

Management Option Guideline

Record the occurrence and severity of anthracnose. No thresholds are available.

Fresh Market Sweet Corn IPM Scouting Procedures

Resistant varieties Consult your seed company prior to purchase.
Crop rotation

The fungus that causes anthracnose overwinters in corn debris and is most often a problem in fields with poor rotation. Plant only in fields where sweet or field corn has not been grown in the previous year to avoid anthracnose. 

Site selection Anthracnose is common in fields early in the season where corn debris from the previous year has been left on the soil.
Postharvest Crop debris should be destroyed as soon as possible to remove this source of disease for other plantings and to initiate decomposition.
Seed selection/treatment
and Sanitation
These are not currently viable management options.
Pesticides Cornell Integrated Crop and Pest Management Guidelines for Commercial Vegetable Production