Fig. 2. The root-lesion nematode (RLN) population in rotation crop roots on 10 Sept. 1999 and in potato roots on 18 July 2000 following (A) two rotation cycles (Exp. A) and (B) one rotation cycle (Exp. B). The natural logarithms of means for rotation crop treatments within an experiment and year with the same letter are not significantly different at P < 0.05. Rye-NF, rye rotation without fumigation; rye-F, rye rotation with fumigation; CGPMH-1, Canadian Grain Pearl Millet Hybrid 1; CFPM 101, Canadian Forage Pearl Millet Hybrid 101; CFSH-17, Canadian Forage Sorghum Hybrid 17.