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Forage Pearl Millet and Marigold as Rotation Crops for Biological Control of Root-Lesion Nematodes in Potato

^a Agric. & Agri-Food Can., Southern Crop Protection and Food Res. Cent., 1391 Sandford St., London, ON, Canada N5V 4T3
^b Agric. & Agri-Food Can., Southern Crop Protection and Food Res. Cent., Box 186, Delhi, ON, Canada, N4B 2W9

View larger version (52K): [in a new window]   Fig. 1. (A) Daily rainfall, temporal trends in (B) soil water content and (C) soil root-lesion nematode (RLN) numbers at Exp. A, and temporal trends in (D) soil water content and (E) soil RLN numbers (back-transformed means) at Exp. B. Within a site and year, the natural logarithms of nematode counts in soil followed by the same lowercase letter are not significantly different (P 0.05) from one another, and values in the same row followed by the same uppercase letter are not significantly different (P 0.05) from one another as determined by the protected LSD test. Exp. A 1999: Rye rotation without fumigation (rye-NF): y = 1977.95 + 52.550x - 1.1281x2 + 0.00525x3, R2 = 0.31; rye rotation with fumigation (rye-F): y = 429.18 + 83.892x - 1.4978x2 + 0.00679x3, R2 = 0.85; Canadian Grain Pearl Millet Hybrid 1 (CGPMH-1): y = 653.74 + 39.365x - 0.7758x2 + 0.003618x3, R2 = 0.51; Canadian Forage Pearl Millet Hybrid 101 (CFPM 101): y = 804.43 + 37.035x - 0.9167x2 + 0.004549x3, R2 = 0.76; Marigold: y = 930.98 + 85.627x - 1.5449x2 + 0.00639x3, R2 = 0.61. Exp. B 1999: Rye-NF: y = 1615.10 - 57.235x + 0.5022x2, R2 = 0.58; Rye-F: y = 1205.90 - 20.220x + 0.2080x2, R2 = 0.46; Canadian Forage Sorghum Hybrid 17 (CFSH-17): y = 1581.53 - 32.622x + 0.2419x2, R2 = 0.59; CFPM 101: y = 1050.99 - 23.343x + 0.1719x2, R2 = 0.47; Marigold: y = 1900.26 - 35.200x + 0.2043x2, R2 = 0.34.

View larger version (37K): [in a new window]   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.

View larger version (59K): [in a new window]   Fig. 3. Potato tuber total- and grade-weight yields in 2000 after (A) two rotation cycles (Exp. A) and (B) one rotation cycle (Exp. B). Treatment least-squares means within an experiment and yield category (total yield, premium yield, small marketable yield, and unmarketable yield) with the same letter are not significantly different at the 0.05 probability level. 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.