Root Rot ofAucuba japonicaCaused byPhytophthora cinnamomiandP. citricolaand Suppressed with Bark Media

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Abstract
P. cinnamomi and P. citricola were pathogenic to A. japonica in laboratory and greenhouse studies. P. citricola was isolated more often than P. cinnamomi from diseased aucubas in landscape plantings and caused a more severe root rot that often resulted in death of the plant. Root rot was suppressed in well-drained pine bark (pH 4.5) and hardwood bark compost (pH 6.8) but not in a soil-sand medium after 10 days. Suppression was lost if media were kept saturated and the pH of pine bark was raised to 6.5 with lime; however, saturated pine bark at pH 4.5 remained suppressive. An apparently nonpathogenic root rot with symptoms similar to those caused by Phytophthora spp. developed when aucuba plants were grown in poorly drained soil amended with cornmeal (1-10% by weight).

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