There are four different types of strains: PPV-D; PPV-C; PPV-EA; and PPV-M. PPV-D (Dideron) is the most common strain of the virus and was originally isolated from apricots in southeast France (Levy). This strain is not known to be seed-transmitted and is the non-epidemic form of the virus. PPV-M (Marcus) is more aggressive in peaches and the aphids are more effective in spreading the virus in an orchard than the PPV-D strain (Plum Pox). PPV-M was originally found in peaches in northern Greece, is the most common in south, east

The easiest method in detection of PPV is using biological index hosts (Levy). It is also detected dependably in woody plants. Strains D and M can be differentiated through western blots according to their molecular weight of the viral coat protein (Levy). Certain techniques in the detection of plum pox have lead to advances in the field of diagnostic plant pathology (Levy). In the 1980’s applications of cDNA and cRNA probes lead to accurate detection of PPV, which helped surmount the problem of low intensity of the virus (Levy). Summertime is when the virus is in low intensity.

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