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Bean anthracnose
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Article Content
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| Colletotrichum lindemuthianum |
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Synonyms
Plant hosts
Cajanus cajan (pigeon pea), Glycine max (soyabean), Lens culinaris (lentil), Lablab purpureus (hyacinth bean), Phaseolus sp. (beans), P. vulgaris (common bean), Vicia faba ( broad bean), Vigna mungo (black gram), V. radiata (mung bean), V. sinensis (asparagaus bean), V. unguiculata (cowpea) are all susceptible to bean anthracnose.
Symptoms
Seedlings growing from infected seed develop small, dark brown to black sunken lesions on cotyledons and stems. Seedlings that are severely infected may be stunted or die prematurely. As plants grow, lesions develop on mature leaves as linear, dark brick red to black lines that follow the leaf veins. As disease progresses, discoloration appears on the upper surface of the leaf. In the field, leaf symptoms are not obvious and are often overlooked. Small, reddish brown to black spots may also develop on pods. Under moist conditions, pink masses of spores exude from lesions. Within the pods, seeds develop brown to black sunken lesions.
 
Symptomatic bean leaf Symptomatic bean pod
Photos courtesy of E. Sikora, J. Kemble, and E. Bauske.
Transmission
The pathogen can survive in infected seed for up to five years under optimal storage conditions. Fungal spores are carried from contaminated plants to healthy plants in windblown rain. In addition, people and machinery can spread spores from contaminated fields to healthy fields when plants are wet and lesions are sporulating.
Geographic distribution
Bean anthracnose is distributed worldwide.
Applicable regulations
603-052-0385: Bean disease control area order, Malheur County
Return to plant pathogen profile list.
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