A standard pea necrosis virus isolate (PNV-E178) and two isolates resembling PNV (Kowl4 and E242) were fully compared with bean yellow mosaic virus type strain B25 (BYMV-B25). PNV-E178 and PNV-like isolates Kowl4 and E242 resembled each other and the earlier described pea necrosis strain of BYMV in their reaction on pea, but differed from BYMV strains studied so far in inclusion bodies, and in their reaction in cucumber.Serologically, PNV isolates E 178 and E242 were closely related to each other and both showed a more distant relationship to BYMV-B25. PNu isolate Kowl4 was serologically intermediate between PNV and BYMV-B25, but was hardly infectious to Phaseolus beans.E242 and, to a lesser extent, also Kowl4 were considered strains of the pea necrosis virus, which is closely related to BYMV, but apparently not more so than bean common mosaic virus, pea seedborne mosaic virus, clover yellow vein virus and some other members of the potyvirus group.The lack of well-definable borderlines between the different taxonomic entities unavoidably leads to problems in diagnosing (identifying) intermediate isolates.
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