Date of Award:

5-1968

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Plant Pathology

Committee Chair(s)

Orson S. Cannon

Committee

Orson S. Cannon

Committee

Wade Dewey

Committee

George Welkie

Abstract

A study was performed using isolates of Verticillium albo-atrum which were reported as varying in their pathogenicities to a susceptible and resistant tomato variety. Also included as objectives in this undertaking were cross-protection and effects of spore density in the inoculum on the development and severity of Verticillium wilt of tomatoes.

After retesting the strains which were reported as pathogenic variants, results suggested that reported variabilities were non-existent in most of the isolates and instead there were only two pathogenic type-categories: (a) strains pathogenic to both resistant and susceptible tomato varieties; and (b) strains pathogenic only to the susceptible variety.

Cross-protection in Verticillium albo-atrum strains used in this study was not apparent.

Spore density in the inoculum and its effect on tomato growth seemed to follow definite trends. With increased inoculum density, there was a significant decrease in tomato growth which could be attributed to the extensiveness of fungal invasion and subsequent infection within the plant.

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