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Production of CPA by L-strain isolates of A. flavus (n = 774) from fields in 18 transect segments, each of which was 150 to 200 km long. The transect segments are shown in Fig. 1. The numbers of fields and numbers of isolates examined are given in the legend to Fig. 3. Transect segments not sharing a common letter are significantly different (P ≤ 0.05) according to Dunn’s test on ranks of CPA concentrations. ND, not detected.
