RNGR.net is sponsored by the USDA Forest Service and Southern Regional Extension Forestry and is a colloborative effort between these two agencies.

U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Skip to content. | Skip to navigation

Home → Publications → Seed and Seedling Diseases in the Western US → Epidemiology of Fusarium on Containerized Douglas-Fir Seedlings. 1.Seed and Seedling Infection, Symptom Production, and Disease Progression

Epidemiology of Fusarium on Containerized Douglas-Fir Seedlings. 1.Seed and Seedling Infection, Symptom Production, and Disease Progression

Investigations were conducted to understand the epidemiology of Fusarium on containerized Douglas-fir seedlings. Types and importance of Fusarium inoculum sources, relationships between seedling infection and symptom production, amounts and types of diseases that occurred throughout typical growth cycles, and the importance of secondary pathogen spread were investigated. Levels of Fusarium on seed could not be used to accurately predict disease incidence within a seedlot. Inverse correlations existed between the amount of Fusarium and Trichoderma on seed. Higher levels of Fusarium were detected on bleach-treated seed, probably because of reductions of Trichoderma populations on treated seed. Fusarium commonly colonized seedling roots without causing disease symptoms. Investigations failed to show spread of Fusarium disease from one container to another. Factors affecting disease symptom expression and implications for control are discussed.


Download this file:

PDF document Download this file — PDF document, 3363Kb

Details

Author(s): USDA Forest Service