Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



The purpose of the portion of this paper pertaining to the spotted alfalfa aphid is to present the results of an ecological study dealing with the distribution and seasonal abundance of the insect. This study was established in four specific areas of four southeastern counties of South Dakota. Observations included the varying weather conditions and their effect on the aphid. Potato leafhoppers were also investigated. Actual proof of the potato leafhopper migratory theory was not forthcoming until 1951 when entomologists of the North Central States, with the aid of entomologists in certain Southern States, voluntarily collected the needed data in a cooperative survey. One of the steps outlined by the North Central States was the need for quantitative collections of the potato leafhopper along with notes on temperature, wind, and other weather conditions present at the time of collections. With these thoughts in mind, a study of this type was begun by this author on May 1, 1957, in these areas already discussed. Activities, periods of abundance, and population curves were developed and analyzed for both species.

Library of Congress Subject Headings

Insect pests -- South Dakota -- Control
Spotted alfalfa aphid
Empoasca Fabae
Alfalfa -- Diseases and pests -- South Dakota


Includes bibliographical references



Number of Pages



South Dakota State University