TABLE 1.

Number of isolates, genetic diversities, disease incidence, number of haplotypes, and chi-square analysis of haplotypic frequencies for X. axonopodis pv. manihotis populations collected at six sites in four ECZs in Colombia

ECZSiteaYrbIncidencecNidHaplotypeHsitegχ2h
NheHYf
1Pivijay19953.53040.58
19963930.56
199714840.56
19983.53990.52
19994.53940.460.69118.8 (0.001)
2Carimagua199543680.83
199641880.83
199742660.780.87113.5 (0.001)
Villavicencio1995424100.81
199641350.91
199723970.64
199845590.62
1999488100.70.80201.1 (0.001)
5Mondomo19964.45260.46
19973.74940.65
199842140.69
199923540.690.73120.1 (0.001)
Cajibio199532230.26
19963.52730.150.222.7 (0.446)
2-4Santander de Quilichao19962640.30
19973.56030.260.5866 (0.001)
  • a Site of collection of the isolates; six sites were visited in four ECZs.

  • b Year of collection of the isolates.

  • c Estimates of disease incidence were made in each field during the sampling, as recommended by Boher and Agboli (5).

  • d Number of isolates collected in each site and each year.

  • e Number of RFLP haplotypes detected in each site and each year.

  • f Genetic diversity of the X. axonopodis pv. manihotis strains collected in 1 year.

  • g Genetic diversity of the X. axonopodis pv. manihotis strains collected in one site in all years.

  • h The chi-square value was significant at the 5% level.