Abstract
Redhaven peach (Prunus persica (L.) Batsch) trees, grafted on the rootstocks Bailey, Siberian C, or Harrow Blood, with roots free of, or infested by, root-lesion nematodes (Pratylenchus penetrans) were planted in fumigated or P. penetrans-infested Vineland fine sandy loam at Jordan Station, Ontario. Tree growth and soil nematode population densities were monitored for 6 yr. In general, fumigation suppressed soil populations of P. penetrans during the first 4 yr, whereas no consistent nematode control was obtained through the use of nematode-free rootstock. The rootstock Siberian C supported larger numbers of P. penetrans than the other two rootstocks throughout the experiment, whereas Bailey favored the build-up of the pin nematode (Paratylenchus projectus). Tree diameter of nematode-free rootstock was greatest in the first 3 yr only; soil fumigation alone increased growth during the first year only. Tree mortality tended to be lowest in fumigated soil planted to clean rootstocks. Harrow Blood showed the highest mortality; Siberian C the lowest. The data suggest that only nematode-free peach trees should be planted. Orchards should be fumigated if P. penetrans exceeds 800 kg−1 of soil and/or when there is a history of replant failure on a light-textured soil.Key words: Prunus persica, pin nematode, Paratylenchus projectus, replant problem, rootstocks, fumigation
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