Worldwide, there are six recognized races of FOV, numbered in order of their discovery. The term “race” used to distinguish these genotypes does not imply a correlation in host gene resistance in the classical use of the term, but the designation of certain genotypes by race has been maintained by the cotton industry. Although eight races were initially identified, molecular classification has eliminated redundancy between races 4 and 7 and races 3 and 5 (Chen et al., 1985, Ibrahim, 1966 and Nirenberg et al., 1994