Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



The Agricultural Census of the United States for 1920 shows that plums rank second to apples in value in comparison with the other orchard fruits, small fruits and grapes produced in South Dakota. There was an eighty-two percent increase in the value of all orchard fruits produced during the year 1919 over the year 1909. The fact that the majority of the more important commercial varieties of plums are entirely self-sterile and others more or less self-sterile is often one reason for the total or partial failure of the orchard to produce fruit when a plot is planted to one variety or to varieties which have defective anthers or pistils. The plant breeder will experience undue discouragement when non-viable pollen is unknowingly used for fertilization in his hybridization work. If more definite information pertaining to the pollen fertility, self-sterility and blossoming dates was available to the commercial orchardist and plant breeder, both could accomplish greater results. With this object in view, the writer undertook an investigation of the problem.

Library of Congress Subject Headings

Plum -- Varieties




South Dakota State University

Included in

Botany Commons