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    Author(s): John Hunt
    Date: 1959
    Source: PNW Old Series Research Notes No. 172, p. 1-6
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (330 KB)


    Results from annual surveys of the destructive Phytophthora root disease of Port-Orford-cedar (Chamaecyparis lawsoniana (A. Murr.) Parl.) show that the disease is gradually spreading and intensifying within the natural range of Port-Orford-cedar. The disease became established on native trees in the early 1950's in the vicinity of Coos Bay, Oreg., and during its initial buildup invaded most of the low-lying area between Tenmile Lake and Port Orford. Since 1955 its progress, although less spectacular, has been characterized by gradual, steady encroachment into new areas.

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    Hunt, John. 1959. Phytophthora lateralis on Port-Orford-cedar. PNW Old Series Research Notes No. 172, p. 1-6

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