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Incidence of yellow mosaic disease on yard long bean occurred widely in some areas in West and Central Java in 2008–2009. The causal agent of this disease is Bean common mosaic virus (BCMV) which can be transmitted through seed and aphids. Research was conducted to determine response of five varieties of yard long bean (Vigna sinensis), i.e. Parade, New Jaliteng, Long Silk, Super Sainan, and Pilar to BCMV infection. Yard long bean plants was inoculated by BCMV mechanically, followed by observation of disease incidence and severity, incubation period, flowering time, and yield. All five varieties of yard long bean showed susceptible response to BCMV infection. Incubation period was 6–16 days, disease incidence was 90–100%, and disease severity was 49.1–69.7%. BCMV infection caused severe symptoms of leaf malformation and plant stunting. Flowering time was delayed 2–5 days on infected plants and yield was decreased up to 46.6%. Breeding program to develop resistance varieties to BCMV is necessary.
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