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The levels of Verticillium dahliae and Pratylenchus spp. were determined in soil and potato plants collected from 77 fields in potato-growing regions of Australia between 1996 and 1997. Verticillium dahliae was detected in soil from 81% of the fields and in plants at 80% of the fields. Densities in soil ranged from 1 to 19 colony forming units per gram of dry soil. Pratylenchus spp. were detected...