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Transect showing fields from which A. flavus soil isolates were obtained. The crops present in the fields included peanuts (○) (n = 40) and corn, cotton, or soybeans (●) (n = 43). The transect was divided into segments 1 to 18, each of which was 150 to 200 km long. The following major peanut-growing regions are indicated: western Texas (region A); central Texas (region B); Georgia and Alabama (region C); Virginia and North Carolina (region D).
