1. Plant Disease
  2. Host and Disease Descriptions

Azalea (Rhododendron spp.)-Phytophthora Root Rot and Wilt

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Latest revision: 
March 2024
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Rotted roots and branch dieback from Phytophthora.

OSU Plant Clinic collection, 2012.

See:

Rhododendron - Phytophthora Root Rot

Note: Azalea cultivars Formosa, Fakir, Corrine Murrah, Merlin, and Hampton Beauty had the lowest root rot ratings but were not different statistically from 28 other cultivars. R. poukanense is a resistant species.