Date of Award:

5-1981

Document Type:

Dissertation

Degree Name:

Doctor of Philosophy (PhD)

Department:

Plants, Soils, and Climate

Committee Chair(s)

Neal Van Alfen

Committee

Neal Van Alfen

Committee

Rulon Albrechtsen

Committee

James Hoffman

Committee

Donald Sisson

Committee

Sherman Thomson

Abstract

A three year study was initiated to study impact, epidemiology and control aspects of crown and root rot of irrigated and dryland spring barley in Utah. Isolations from leading edges of necrotic lesions of infected plants showed Cochliobolus sativus to be most frequently isolated. Yield loss studies showed that the disease had it's greatest effect in kernel weight reduction.

Time course studies of disease initiation, development and progress were made throughout two consecutive growing seasons. Disease initiation began 25-30 days after planting and reached maximum levels at approximately 60-80 days. Soil inoculum levels were determined by the flotation viability method and the pathogen was found to be present universally, although variable in population level.

Certain barley varieties and experimental breeding lines appeared to be less susceptible to the disease than the more commonly grown commercial varieties. The effect of different spray chemicals and seed treatment fungicides on control of the disease was examined.

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