VIRUS DISEASES OF FABA BEANS IN MANITOBA AND THEIR EFFECTS ON PLANT GROWTH AND YIELD

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Abstract
Faba beans (Vicia faba var. minor Beck, and V. faba equina Pers.) in Manitoba showed a range of leaf mosaic and leaf and shoot necrosis symptoms. Virus isolates from diseased plants were grouped as mild (leaf mosaic, no necrosis) and severe (mosaic with necrosis) types. Two contrasting isolates were identified as variants of bean yellow mosaic virus by host range, aphid transmission, electron microscopy and serology. In field experiments, early infection of faba beans had a severe effect on root nodulation. Infections at pre-bloom, full bloom and post-bloom reduced yields by 59, 48 and 17% (mild isolate) and 96, 70 and 17% (severe isolate), respectively. Neither of the two isolates was transmitted through seed from plants infected at any of the three stages.

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