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Plantwise Technical Factsheet

rust of broad bean (Uromyces viciae-fabae)

Host plants / species affected
Lathyrus (Vetchling)
Lens
Lens culinaris subsp. culinaris (lentil)
Pisum (pea)
Pisum sativum (pea)
Vicia (vetch)
Vicia angustifolia (Narrowleaf vetch)
Vicia cracca (Tufted vetch)
Vicia faba (faba bean)
Vicia faba var. major (broad bean)
List of symptoms/signs
Leaves  -  abnormal leaf fall
Leaves  -  fungal growth
Symptoms
U. viciae-fabae causes rust on leaves and stems of broad bean, pea, vetch and lentil, causing partial defoliation of susceptible varieties.
Prevention and control
Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Cultural Control

Bhardwaj and Sharma (1996) reported that the percentage disease index of U. viciae-fabae on peas was lowest in 15th October sowing followed by 30th September sowings (compared with early September or late October sowings) in Himachal Pradesh, India.

However, Singh et al. (1996) reported that in Madhya Pradesh a mean seed yield of 2.23, 1.80, 1.29 and 0.61 was obtained for sowing on 5 October, 25 October, 14 November and 4 December, respectively. The incidence of rust increased as sowing was delayed.

Use of the lentil cultivar Masoor 93, derived from a cross between ILL4400 (Syrian variety) and 18-12 (Indian variety), was recommended because of it's high yield potential (3843 kg/ha), wide adaptability and high resistance to rust.

Chauhan and Singh (1994) reported that severity of infection by U. viciae-fabae on pea and pustules/plant increased progressively with an increase in the duration of leaf wetness up to 24 h, but did not increase further significantly. Both were high at 20°C under greenhouse and laboratory conditions. It was suggested that the observed relationship between severity of pea rust and duration of leaf wetness at 20°C may be useful in predicting disease outbreaks if an initial inoculum is present.

Rashid and Bernier (1991) found rust yield losses of only 1-2% in the slow-rusting population cultivar 2N43, of 1-11% in slow-rusting populations from cultivar Erfordia and cultivar Diana, and of 6-43% in other slow-rusting populations, indicating that some slow-rusting populations of Vicia faba are more tolerant to rust than others.

Conner and Bernier (1982b) suggested that native plant species may have an important role in the epidemiology of rust on Vicia, Lathyrus and Pisum.
Impact
Marcellos et al. (1995) estimated that rust in Vicia faba accounted for yield loss mainly by reducing seed size. Application of mancozeb early and during late flowering provided an effective and economical increase in grain yield.

Sache and Zadoks (1995) suggested that the effect of U. viciae-fabae rust on yield components of V. faba could be predicted by a critical point model using disease severity assessed on the middle or bottom canopy layer in the mid-flowering stage. Rust severity >5% during that critical stage would substantially decrease final yield and fungicide spraying against rust would be advised.

Lapwood et al. (1984) reported results on the effect of U. viciae-fabae on the yield of spring-sown V. faba in the UK. Fungicide sprays of maneb + mancozeb (protective) or propiconazole (systemic) applied two or three times to control rust (with a no fungicide control) resulted in overall yields of 4.51 and 5.43 t/ha in unsprayed and sprayed treatments, respectively. The difference was accounted for by the weight of individual grains and not by the number of pods/plant or grains/pod.
Related treatment support
 
External factsheets
RHS Gardening Advice Factsheets, Royal Horticultural Society, 2012, English language
Plant Health Australia Factsheets, Plant Health Australia, English language
Department of Agriculture and Food Western Australia Farmnotes, Government of Western Australia, 2006, English language
PlantVillage disease guide, PlantVillage, English language
DPI NSW factsheets, New South Wales Government, Department of Primary Industries, Australia, 2002, English language
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