Research Branch


See below to download.
   

Dieback of Container-Grown Douglas-fir Seedlings

Author(s) or contact(s): L.D. Husted and S. Barnes
Source: Research Branch
Subject: Seedling Production
Series: FRDA Report
Other details:  Published 1989. Hardcopy is available.
 

Abstract

This report summarizes the second year of a two year study on Douglas-fir dieback. Dieback of container-grown Douglas-fir seedlings is caused by a minor root pathogen, Pythium. Possible sources of Pythium in nursery mixes include peat, water, air-borne spores and reuse of contaminated styroblocks. The incidence and severity of dieback damage are strongly influenced (1) by seedling susceptibility to the pathogen, which is highest the first few weeks after germination, and (2) by the environmental conditions, particularly the moisture content, temperature and pH of the growing mix.

FRDA Research Report 142 (2603 KB)

To view this document you need the current version of
Adobe Acrobat Reader, available free from the Adobe Web Site.

Updated July 24, 2015