ISHS Acta Horticulturae 352: VI International Symposium on Rubus and Ribes
EFFECT OF PHYTOPHTHORA FRAGARIAE VAR. RUBI ON YIELD COMPONENTS AND COLD HARDINESS OF RED RASPBERRY. |
| Authors: | P.R. Bristow, R.L. Hummel |
| Keywords: | P. erythroseptica, plant development |
| Abstract:
Root rot caused by Phytophthora fragariae var. rubi reduced yield of untreated 'Willamette' plants by 77% compared to those treated with metalaxyl. Yield was reduced only 49% for plants treated with fosetyl-Al. Root rot reduced the number of fruiting canes per plant, flowers per lateral and weight per berry. Berries per flower was not affected. Laterals per cane increased, but the increase was an artifact due to shorter internodes on infected canes. Laterals on infected canes were shorter and had smaller leaves. Root rot had no impact on cold hardiness of either buds or canes. The interval between bud break and mid-harvest for untreated plants was 14 days shorter than for plants treated with metalaxyl. Twelve of those days were lost between bud break and flowering. | |
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