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Filtering by: Subject Roses -- Rootstocks -- Diseases and pests -- Control Decade 1960-1969 Degree Level Doctoral

Relation of nitrogenous substances in rose leaves to powdery mildew resistance

Creator:

Bartlett, Allan B.

Abstract:

There is considerable variation among rose varieties in susceptibility to mildew, and as a result of maturation, leaves of most susceptible varieties become resistant to infection. The nature of resistance has been sought in various studies involving environmental, morphological, and physiological factors. An attempt was made in the present investigation...

Resource Type:

Dissertation

Full Text:

disease. Two or more extracts from healthy and diseased leaves from each of the six rose varieties were
Coniothyrium rose canker in Oregon

Creator:

Intrama, Siriphong

Abstract:

An isolate of Coniothyrium obtained from a stem canker on Nocturne rose from the Botany Department Farm, Corvallis, Oregon was studied with respect to morphological and cultural characters, pathogenicity and mineral nutrition. The hyphae of the isolate were smooth, septate and branched. The hyphal cells averaged 16.37 X 3.52 microns....

Resource Type:

Dissertation
Isolation, purification, serology and nature of rose mosaic virus

Creator:

Halliwell, R. S. (Robert S.)

Resource Type:

Dissertation

Full Text:

records of a virus-like disease of rose in the United States was by Taubenhaus in 1923 (37) and 1925 (38