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Diseases of Faba Beans | |
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| Chocolate Spot | Ascochyta Leaf and Pod Spot | Mosaic | Powdery Mildew | Rust | Seedling Blight | Root Rot | Sclerotinia Stem Rot | Heat Canker | Herbicide injury
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Chocolate Spot.
Botrytis fabae, B. cinerea
What to look for?
A highly destructive disease of faba beans in cooler climates in Europe but not much of a problem on the prairies.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.80E!OpenElement&FieldElemFormat=jpg)
Photo: Howard | Picture description
Bold chocolate spots. |
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Management strategy
Ascochyta Leaf and Pod Spot.
Ascochyta fabae f.sp. fabae
What to look for?
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.1254!OpenElement&FieldElemFormat=jpg)
Photo: Zimmer | Picture description
Chocolate spots on pods and leaves. | ![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.18D6!OpenElement&FieldElemFormat=jpg)
Photo: Kharbanda | Picture description
Tan to blackish lesion which produces typical botrytis sporulation (i.e. gray mold). |
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![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.2102!OpenElement&FieldElemFormat=jpg)
Photo: Kharbanda | .
Picture description
Seed borne phase of chocolate spot. | ![](/icons/ecblank.gif) | ![](/icons/ecblank.gif) |
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Management strategy
Use disease free seed and follow a 3 - 4 year crop rotation.
Mosaic.
Bean Yellow Mosaic Virus
What to look for?
Seed-borne from trace to 5% in faba bean. In areas of high aphid activity, a large percentage of this aphid-stylet borne virus will infect the crop, even up to 100%. Yield losses result but only 2-5% of the seed will subsequently carry the virus.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.2C58!OpenElement&FieldElemFormat=jpg)
Photo: Evans | Picture description
Typical mosaic virus. |
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Management strategies
Use virus-free seed if at all possible.
Powdery Mildew.
Microsphaera penicillate var. ludens
What to look for?
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.3834!OpenElement&FieldElemFormat=jpg)
Photo: Rashid/Bernier | Picture description
Shows up very late in the season on faba beans, sometimes only on individual plants. |
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Management strategies
Not really a disease problem.
Powdery Mildew Frequently Asked Questions
Rust.
Uromyces viciae - fabae
What to look for?
Not generally a problem disease in Canada. The fungus is seed-borne and has 5 spore stages. Some strains of this rust can attack peas and vetches.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.4830!OpenElement&FieldElemFormat=jpg)
Photo: Morrall | Picture description
Rusted leaf. | ![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.5014!OpenElement&FieldElemFormat=jpg)
Photo: Rashid/Bernier | Picture description
Rust on the bean pods. |
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Management strategy
Seedling Blight.
Rhizoctonia solani
What to look for?
Rhizoctonia may cause some damage in cold dry or cold wet springs. Stand density is not usually seriously affected.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.591C!OpenElement&FieldElemFormat=jpg)
Photo: Kharbanda | Picture description
Rhizoctonia lesions. |
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What to look for?
A pythium type damping off fungus that has been isolated from faba beans in Manitoba.
Aphanomyces euteiches
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.6256!OpenElement&FieldElemFormat=jpg)
Photo: Rashid/Bernier | Picture description
Seedling blight. |
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Management strategy
Root Rot.
Fusarium sp. Rhizoctonia solani
What to look for?
Fusarium sp. are sometimes found alongside Rhizoctonia infections in seedling stands.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.6E10!OpenElement&FieldElemFormat=jpg)
Photo: Kharbanda | Picture description
Stem and root rot. |
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Management strategy
Sclerotinia Stem Rot.
Sclerotinia sclerotiorum
What to look for?
Found very occasionally in faba beans. Not really a disease problem.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.7720!OpenElement&FieldElemFormat=jpg)
Photo: Platford | Picture description
Sclerotinia infection. | ![](/icons/ecblank.gif) | ![](/icons/ecblank.gif) |
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Management strategy
Heat Canker.
Non-parasitic
What to look for?
Collar damage can occur with rapid seedling emergence, in hot sandy type soils.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.83EA!OpenElement&FieldElemFormat=jpg)
Photo: Rashid/Bernier | Picture description
Collar injury. |
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Management strategy
Herbicide Injury.
Picloram/soil persistent
What to look for?
Faba beans are sensitive to less than 1/2 part per billion of this soil persistent herbicide. Faba beans may easily pick up Picloram that was applied as a spot treatment to soils as much as 40 years earlier. A half ounce per acre of Picloram for weed control in cereals will show up in faba beans two years or more after application.
![](/$department/deptdocs.nsf/ba3468a2a8681f69872569d60073fde1/9c15a7dcefea745287256df8005ee433/Information/0.8CE2!OpenElement&FieldElemFormat=jpg)
Photo: Rashid/Bernier | Picture description
Severe leaf distortion. |
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Management strategy
Avoid Picloram use in a faba bean rotation.
Photographs and information assembled and prepared for ARD by Dr. Ieaun R. Evans Agri-Trend Agrology Ltd. |
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Other Documents in the Series |
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Diseases of Chick Peas Diseases of Faba Beans - Current Document Diseases of Field Beans Diseases of Lentils
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For more information about the content of this document, contact Robyne Bowness.
This document is maintained by Shelley Barkley.
This information published to the web on December 10, 2003.
Last Reviewed/Revised on April 28, 2014.
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