ISHS Acta Horticulturae 262: V International Symposium on Rubus & Ribes
EFFECT OF PRATYLENCHUS PENETRANS ON ROOT ROT OF RED RASPBERRY CAUSED BY PHYTOPHTHORA ERYTHROSEPTICA |
| Authors: | T.C. Vrain, H.S. Pepin |
| Abstract:
Greenhouse and field microplot experiments were used to study the interaction between Pratylenchus penetrans and Phytophthora erythroseptica in red raspberry roots (Rubus idaeus). Selfed seedlings of cv. Skeena were inoculated in the greenhouse with 0, 4 000 and 8 000 nematodes per plant, with or without a mycelial suspension of the fungus. P. erythroseptica reduced raspberry growth in 65 days. After 115 days 43% of plants inoculated with fungus alone and 46% of plants inoculated with fungus and nematodes had died. The fungus but not the nematodes lowered the weight of canes and foliage. Fungus and nematode separately, or together, impaired root development with significant interaction (P < 0.05). Raspberry plants cv. Willamette were grown in field microplots for three years in P. penetrans infested field soil. At planting, soil nematode densities ranged from 0 to 1 470 per 50 ml. The initial high densities of nematodes in field soil depressed shoot growth for three years. P. erythroseptica depressed shoot growth in plots with low initial nematode densities. These results suggest that the additive interaction between the two pathogens is a weak one, probably due to the aggressiveness of the fungus. | |
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