Figure 4.

Same map as in Figure 2 showing migratory pathways inferred from the geographical distribution of haplotype ratios. Open ovals estimate the extent of the overwintering range in Texas and Florida. Fall armyworm can overwinter in the Caribbean but whether these populations contribute to those in Florida is a matter of speculation (see text). White arrows indicated putative direction of the migration from the Texas–Mexico overwintering areas. Shaded arrows depict movement from Florida populations. Lined circles approximate locations of “hybrid zones” where the two migratory pathways appear to overlap. Diagonal line follows the major elevations of the Appalachian Mountain range.