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Root Rot of Chamaecyparis Caused by a Species of Phytophthora
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1942
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BiologyChamaecyparis Lawsoniana VarPhysiological Plant PathologyBotanyNatural SciencesPhytoplasmasC. Lawsoniana VarPlant PathologyFungal BiologyMicrobiologyRoot RotSummarya Root RotTree DiseasePlant Health
SUMMARYA root rot of Chamaecyparis occurring in Oregon and Washington is attributed to Phytophthora lateralis.The fungus invades the young roots and eventually girdles the trunk; characteristic color changes of the foliage accompany the destruction of root and stem tissues and infected trees are killed.In culture the causal fungus grows slowly on agar media. The optimum temperature is about 20° C.; growth is reduced at 25° C., and inhibited at 30° C.The disease has been identified in Chamaecyparis Lawsoniana var. alumi, C. Lawsoniana var. erecta and C. obtusa var. gracilis.