Index Catalog // ScholarsArchive@OSU

Creator:: Fellin, David G.
Abstract:: Food habits and biology of five species of Pleocoma larvae were studied at a dozen forested sites in western Oregon between May 1960 and December 1961. First instar Pleocoma hatch in late summer and moult to second instars in early fall. Second and subsequent instars moult annually between mid-summer and...
Resource Type:: Dissertation
Full Text:: supported by the Oregon Agricultural Experiment Station. I would like to thank Dr. P. O. Ritcher and Dr. J

Creator:: Greene, Gerald L.
Abstract:: Field biology studies of three grain aphids, Macrosiphum avenae (Fabr.), Acyrthosiphon dirhodum (Walker), and Rhopalosiphum padi (L.) were conducted near Corvallis, Oregon, from 1961 to 1964. Populations of M. avenae were found on grain plants, and alatae entering spring barley may have been from wheat fields. Specimens were found more...
Resource Type:: Dissertation
Full Text:: . Paul O. Ritcher who arranged my research assist- antship and was very helpful during the degree work

Creator:: Baker, Charles William, 1937-
Abstract:: A study of the immature stages of the subfamily Troginae in North America was conducted from the spring of 1963 through the spring of 1965, Larvae of Trox and Omorgus were easily reared in the laboratory, but all attempts to rear the larvae of Glaresis were unsuccessful, The suberosus group,...
Resource Type:: Dissertation
Full Text:: study. A special debt of gratitude is owed to the following: Dr. Paul O. Ritcher who suggested the

Creator:: Daterman, Gary E.
Abstract:: Major objectives of the study involved development of a laboratory procedure to obtain mating, determining characteristics of female sex attraction, and determination of the effects of temperature and humidity on mating and fecundity. The second of two methods devised to obtain mating, "the vertical airflow technique," was convenient to employ...
Resource Type:: Dissertation
Full Text:: for privacy Abstract approved: (Major professor) Dr. Paul O. Ritcher Major objectives of the

Creator:: Wattanapongsiri, Anuwat
Abstract:: A taxonomic study was made on the genera Rhynchophorus and Dynamis of the weevil family Curculionidae which includes all of the species known to occur in the world. The bibliography lists all the important papers published to date on the taxonomy and bionomics of these weevils. A full synonymy is...
Resource Type:: Dissertation

ScholarsArchive@OSU