HPIPM:Anthracnose Spinach

Author: Howard F. Schwartz and David H. Gent

Identification and Life Cycle

Anthracnose of spinach is caused by the fungus Colletotrichum spinaciae. The disease cycle is initiated by spores disseminated by wind and splashing irrigation and rainwater. The disease is most destructive at temperatures between 79 to 86º F, with abundant moisture. The fungus overwinters in seed and infested crop debris.

Plant Response and Damage

Anthracnose symptoms initially appear as small, dark olive-colored water-soaked spots. As the spots enlarge, they become tan in color. Under disease favorable conditions, lesions become larger and more numerous, eventually coalescing and killing entire leaves and petioles. If weather conditions become less favorable for disease, severely infected leaves will drop from the plant and new foliage will appear relatively free from infection.

The disease reduces both spinach yield and quality.

Biological Control

No biological control practices have been developed for anthracnose.

Cultural Control

Plant high quality spinach seed free from the anthracnose pathogen. Practice a three-year or longer rotation to nonhosts, such as small grains or corn. Avoid overhead irrigation, especially during humid, cloudy weather. Deeply bury crop residues soon after harvest to reduce pathogen survival and overwintering. Eliminate volunteer spinach.

Chemical Control

Chemical controls are most effective when integrated with sound cultural control practices.

Due to constantly changing labels, laws and regulations, the sponsors of this web site assume no liability for the suggested use of any chemicals noted in the management section. Contact your local pest management personnel for current information on labeled pesticides that can be used for the intended plant disease, insect pest or weed.