Table 2. Nucleotide diversity of p20 gene of CTV isolates from Italy corresponding to different introductions.

	Sicily A	Sicily B	Sicily C	Sicily D	Sicily E	Apulia
Sicily A	NA *
Sicily B	0.088±0.017	0.008±0.001
Sicily C	0.097±0.017	0.109±0.015	0.006±0.002
Sicily D	0.090±0.018	0.088±0.013	0.033±0.008	0.008±0.002
Sicily E	0.089±0.017	0.089±0.014	0.032±0.008	0.009±0.002	0.009±0.002
Apulia	0.099±0.019	0.020±0.005	0.127±0.018	0.104±0.015	0.104±0.015	0.013±0.004

^*NA = non-applicable as there is only one CTV isolate.

^†Nucleotide diversities and standard errors of CTV isolates proceeding from a possible introduction (in italics) or between CTV isolates from different introductions.