ISHS Acta Horticulturae 465: IV International Peach Symposium
GREENHOUSE EVALUATION OF PRUNUS ROOTSTOCKS FOR RESISTANCE OR TOLERANCE TO THE ROOT LESION NEMATODE (PRATYLENCHUS PENETRANS) |
| Authors: | W. McFadden-Smith, N.W. Miles, J.W. Potter |
| Keywords: | peach, fumigation, damage threshold |
| Abstract:
Ten Prunus rootstocks were tested for resistance/tolerance to the root lesion nematode, Pratylenchus penetrans, in a greenhouse experiment. Populations initially were 2500 and 4000 nematodes kg-1 of soil in 1995 and 1996 experiments, respectively. Each week for 4 consecutive weeks, five 20 cm tall seedlings of each rootstock were planted in soil either infested with nematodes or steam sterilized soil (non-infested), one seedling/61 pot, arranged in a randomized complete block experiment and grown for 14 weeks. At harvest, data were collected on leaf area, plant height, stem X-sectional area, dry weights of tops, coarse roots and fine roots and P. penetrans kg-1 of soil and P. penetrans g-1 dry fine roots (Baermann pan method). No differences in plant growth were obtained in the 1995 experiment. In 1996, all growth parameters were less for plants grown in nematode-infested than non-infested soils for all rootstocks tested. The ratios of non-infested vs. infested for dry weight of tops and fine roots and the concentration of P. penetrans in fine roots and soil were used to distinguish differences in susceptibility/resistance or tolerance to root lesion nematode among rootstocks. Bailey, BY520-8, Higama, and Guardian were less susceptible and Chui Lum Tao was more tolerant than other rootstocks tested. The results of 1995 and 1996 experiments suggested that the damage threshold lies between 2500 and 4000 lesion nematodes kg-1 soil. | |
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