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Filtering by: Subject Onions -- Diseases and pests -- Oregon Advisor Vaughan, E. K.

A compound from onion roots inhibitory to Pyrenochaeta terrestris

Creator:

Pfleger, Francis Louis

Abstract:

In vitro tests showed mycelial growth of Pyrenochaeta terrestris was inhibited by root and bulb extracts from the pink root resistant onion cultivar Nebuka, but not by extracts from the susceptible Southport White Globe. The active principle was shown to be fungistatic rather than fungicidal. It is present in both...

Resource Type:

Dissertation

Full Text:

of the onions in both eastern and western Oregon are grown on land infested with the onion pink root
The etiology of bacterial soft rot of onions and identification of the causal organisms

Creator:

Irwin, Roger Deane

Abstract:

Observations of bacterial soft rot of onions in the Lake Labish area in the Willamette Valley of western Oregon showed that two distinct symptom types occur during the growing season. The most prevalent symptom type appears in infected plants as a wilting and chlorosis of two or more lower leaves...

Resource Type:

Dissertation

Full Text:

extend grateful appreciation to the Western Oregon Onion Growers Association for financial support and
Resistance mechanisms against onion pink root (Pyrenochaeta terrestris), bioassay of inoculum potential in soil and chemical control

Creator:

Siemer, Sidney R.

Resource Type:

Dissertation

Full Text:

diluted with quartz sand and planted with Southport White Globe onion seed. Disease readings made
Pink root of onion caused by Pyrenochaeta terrestris

Creator:

Hess, Wilford M., 1934-

Resource Type:

Dissertation

Full Text:

correlation between cultural practices and onion pink root disease in either eastern Oregon or western