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Integrated Control of Phytophthora Root Rot of Red Raspberry
W F Wilcox1, M P Pritts2, M J Kelly2
1Department of Plant Pathology, Cornell University, New York State Agricultural Experiment Station, Geneva 14456.
Plant Disease
|March 8, 2019
Summary
Cultivar choice is critical for managing Phytophthora root rot in red raspberries. Raised beds significantly reduce disease and boost yield, especially for resistant cultivars like Newburgh.
Area of Science:
- Plant Pathology
- Horticulture
- Agricultural Science
Background:
- Phytophthora root rot, caused by Phytophthora fragariae var. rubi, significantly impacts red raspberry production.
- Integrated disease management strategies are crucial for mitigating crop losses.
Purpose of the Study:
- To evaluate the efficacy of various control measures against Phytophthora root rot in red raspberries.
- To determine the interactions between different management components and their impact on disease control and plant performance.
Main Methods:
- A factorial experiment over three growing seasons assessed cultivar susceptibility, bed height, straw mulch, biological control (Trichoderma virens), and fungicide (metalaxyl) application.
- Disease incidence and severity were measured visually and by assessing cane density, vigor, and yield.
Main Results:
- Cultivar was the most significant factor influencing disease incidence and severity.
- Raised bed cultivation consistently reduced disease and improved plant performance, significantly increasing yield.
- Straw mulch exacerbated disease; biological control showed minimal effect; metalaxyl offered initial control but had variable long-term benefits depending on cultivar and bed height.
Conclusions:
- Cultivar selection and raised bed cultivation are key components for effective Phytophthora root rot management in red raspberries.
- Integrated approaches, considering cultivar-specific responses, are essential for optimizing disease control and yield.
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