Pacific Northwest Research Station

Title: Phytophthora lateralis on Port-Orford-cedar.

Author: Hunt, John.

Date: 1959

Source: PNW Old Series Research Notes No. 172, p. 1-6

Station ID: OSN-PNW-172

Description: 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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Citation

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