ISHS Acta Horticulturae 112: Symposium on Breeding and Machine Harvesting of Rubus
REACTION OF RED RASPBERRY CLONES TO THE ROOT LESION NEMATODE |
| Authors: | P.R. Bristow, B.H. Barritt, F.D. McElroy |
| Abstract:
Red raspberry clones differing in their field susceptibility to root rot (Phytophthora erythroseptica) were evaluated for their reaction to the root lesion nematode (Pratylenchus penetrans). Individual rooted cuttings were planted in 200 cc of fumigated soil in the greenhouse. At planting 1000 nematodes were poured around the roots of each of eight plants per clone. After 110 days, various plant growth measurements were made and the number of nematodes in the roots and soil was determined. Of the 18 clones tested, total fresh weight change (final wt minus initial wt) of 'Matsqui', 'Glen Isla', and 'Latham' plants was reduced by the infestations 26, 37, and 42%, respectively, compared to non-inoculated controls. For these three clones the final number of nematodes per pot was less than the initial 1000. Even though the population of nematodes more than doubled on 'Newburgh', 'Chilcotin', 'Skeena', and 'Canby', no reduction in plant growth occurred. The growth of 'Willamette', the predominant cultivar in the Pacific Northwest, was unaffected as was the initial nematode population. There was no correlation between the reaction of clones to the root lesion nematode in this greenhouse study and their reported field susceptibility to root rot. The least root rot susceptible clone, 'Latham', sustained the greatest damage from the root lesion nematode. | |
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