Identification & Management of Field Crop Diseases in Victoria

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  3. Identification & Management of Field Crop Diseases in Victoria
  4. Diseases of Faba Beans
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Summary

DiseaseOrganismSymptomsOccurrenceHostsControl
Ascochyta blightAscochyta fabaeLarge, light tan to grey spots on leaves. Small black fruiting bodies develop within spots. Centres of lesions may fall out, leaving holes in leaves. Sunken lesions on stem similar in colour to leaf lesions. Brown-black discolouration of grain.Common in all faba bean growing areas in southern Aust. Usually the first disease present in new crops. Most severe in wet seasons.Faba bean, vetch
Spores spread by wind and rain Infected seed
Foliar fungicides

Resistant varieties

Crop rotation

Control volunteer plants

Clean seed
Chocolate spotBotrytis fabae
Botrytis cinerea
Passive phase: small chocolate covered spots scattered over leaves Aggressive phase: tissue around spots turn dark grey and black. Leaves die and blacken.Occurs in all areas where beans are grown. Disease usually becomes established in late winter and becomes more severe as day temperatures increase during spring. Can destroy unprotected crops in wet seasons.Faba bean
Spores spread by wind and rain
Foliar fungicides

Resistant varieties

Crop rotation

Control volunteer plants
RustUromyces viciae-fabaeNumerous small, orange-brown rust pustules, surrounded by a light yellow halo on the leaves of infected plants.Most prevalent in northern Aust. Crops usually affected late in the season.Faba beanFoliar fungicides

Crop rotation

Control volunteer plants
Stem nematodeDitylenchus dipsaciPatches of malformed and stunted plants with curling leaves and water soaked spots. Stem may die back, turning reddish-brown colour.Most severe in wet seasons.Faba bean, pea, oat, wild oat Infected seed straw or soil. Nematode can survive many years in seed, straw or soilSeed test

Crop rotation
Sclerotinia stem rotSclerotinia trifoliorum var. fabaeStunting, tip yellowing, small and thick leaves.Rapid development of disease in wet, cool conditions.Wide host range. Foliar form of disease spread by air-borne spores. Fungus survives in the soil for many yearsCrop rotation

Lower seeding rates, wider row spacings and good weed control
Subterranean clover stunt virusVirusInfection usually begins close to ground level and slimy wet rot extends into stem and down into the roots. Plants easily pulled from soil and have blackened base covered with cottony, white fungus growth. Usually isolated plants that suddenly wilt and collapse. Sclerotinia on surface and within stem turn from white to black.Prevalent in all bean growing areas. Symptoms appear early on faba bean .Sub clover, faba bean, lupin, lentil, chickpea, lucerne, soybean Managing aphids and weeds
Bean leaf roll virusVirusInterveinal yellowing, leaf rolling, stunting, leathery leaves.Occurs in all bean growing areas.The host range is limited to FabaceaeManaging aphids
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