Figure 1. Frequency of Xanthomonas oryzae pv. oryzae (Xoo) races in the Philippine archipelago during a 40-year collection period (1972 to 2012).

Color blocks represent the different races described in the Xoo database. The number of Xoo entries that were collected in the following periods are: 1972–1976 = 75, 1977–1981 = 34, 1982–1986 = 59, 1986–1992 = 133, 1993–1997 = 861, 1998–2002 = 861, 2003–2007 = 237, and 2007–2012 = 104.