Uromyces viciae-fabae (rust of broad bean)

Singh and Singh (1997) reported results of nine fungicide treatments for the control of pea rust caused by U. viciae-fabae comprising a first spray of fungicides applied just after the appearance of symptoms, followed by two more sprays at 10-day intervals. Flutriafol was the most effective fungicide giving 74.7% disease control and increased the grain yield of pea. From the pooled data from two seasons it was concluded that three sprays of flutriafol, metalaxyl or tridemorph could be recommended for the management of pea rust. Khaled et al. (1995) reported that spraying faba bean with mancozeb was most effective in reducing leaf spots and rust disease severity.Marcellos et al. (1995) found that mancozeb and tebuconazole were effective in reducing the severity of diseases on faba beans.Dobson and Giltrap (1991) reported that chlorothalonil-containing mixtures gave comparable control of rust and yield responses at low to moderate infection pressure to those obtained with fenpropimorph. Under high disease pressure, fenpropimorph was superior to chlorothalonil in terms of rust control and yield in faba beans.Mansour (1980) reported that U. viciae-fabae, which causes serious damage to faba beans in Egypt, was controlled with sprays of oxycarboxin, triforine, chlorothalonil and mancozeb, and yields were increased; mancozeb + 0.05% Triton B 1956 was significantly superior to the other treatments.

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.