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Sugarcane mosaic virus strain maize dwarf mosaic virus B (SCMV-MDMV-B) and maize dwarf mosaic virus (MDMV) are aphid-vectored potyviruses that infect eastern gamagrass ( Tripsacum dactyloides (L.) L.), a perennial grain which has potential as a human or animal foodstuff. The potential to manage these diseases through intercropping eastern gamagrass with other, non-host perennial species was examined by monitoring incidence and severity on eastern gamagrass within experimental monocultures, two-species mixtures with wildrye ( Leymus racemosus (Lam.) Tsvelev), two-species mixtures with Illinois bundleflower ( Desmanthus illinoensis (Michx.) MacM., Leguminosae), and three-species mixtures with wildrye and Illinois bundleflower at two sites in Kansas, USA, from 1991 to 1995. Wildrye and bundleflower, which are also potential grain crops, are not reported to be hosts of the viruses. At Site 1, in 1991 and 1992, disease was generally less frequent and less severe in biculture with bundleflower and in the three-species mixture than in monoculture or the biculture with wildrye. No treatment effects were observed at Site 2. Disease severity was negatively correlated with plant size and seed yield at Site 1. Seed yield per plant was generally higher in polyculture than in monoculture. The results suggest polyculture may contribute to the management of aphid-borne plant disease within plantings of perennial grains. |
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