ISHS Acta Horticulturae 262: V International Symposium on Rubus & Ribes
THE IMPACT OF PHYTOPHTHORA ERYTHROSEPTICA AND WINTER SOIL FLOODING ON 'WILLAMETTE' RED RASPBERRY. |
| Authors: | P.R. Bristow, G.E. Windom, J.S. Cameron |
| Abstract:
Wilting of primocanes and early senescence of fruiting canes during the growing season are symptoms of root rot caused by Phytophthora erythroseptica. They might also be the result of root damage due to soil flooding in late winter as root growth resumes. Potted red raspberry plants, with (inoculated) and without (uninoculated) the pathogen, were flooded on six dates (January-March) and for periods up to 16 days in a screenhouse experiment. Growth measurements were taken in June-July to assess the impact of root rot and flooding. Root rot reduced the total dry weight of plants. The reduction was due mainly to fewer and shorter primocanes. The pathogen did not lower the dry weight of fruiting canes or roots; nor did it alter bud viability on fruiting canes. Flooding alone had no impact on the total dry weight or dry weight partitioning of uninoculated plants. Although flooding did not visibly change uninoculated plants, it did depress photosynthesis. The greatest reductions occurred with the longest flooding duration and the latest initiation date. Photosynthesis in inoculated plants was further reduced. | |
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