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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.

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Summary
This summary is machine-generated.

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.

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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.