Abstract
Sequential transmission tests of Peanut stunt virus (PSV) and Cucumber mosaic virus (CMV) systemically infecting common bean, Phaseolus vulgaris, were conducted using Myzus persicae allowed to fast for 2 hr and then to acquisition feed on infected common bean plants or purified virus for 10 min. In the sequential transmission tests using either one or 10 aphids per assay plant, three isolates of PSV (J,S,Y5) and one of CMV (V) were transmitted from and to common bean up to a third or fourth inoculation access. Many aphids transmitted these viruses to two or three plants. Purified viruses of PSV-S and CMV-V were also transmitted up to a third or second inoculation access at low percentage. On tobacco, Nicotiana tabacum, aphids transmitted PSV-S and CMV-V only in the first inoculation access, although PSV-S was transmitted to only one plant in the fourth and fifth inoculation access. These viruses may be transmitted in two phases by aphids, depending on the plant species.
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