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Creator:: Bell, Harry Thomas
Abstract:: The life history of the Obscure Root Weevil, Sciopithes obscurus (Horn), on Rhododendron was studied at four sites in the Willamette Valley. This research was conducted in an effort to provide information necessary to develop adequate methods to control this Curculionid pest on Rhododendron in the Willamette Valley. Five larval...
Resource Type:: Masters Thesis
Full Text:: WEEVIL, Sciopithes obscurus (Horn), ON RHODODENDRON. Abstract approved: Redacted for Privacy Richard

Creator:: La Lone, Ralph Stanley
Abstract:: Two types of exogenous mortality factors, density-independent and density-dependent, were identified for the black vine weevil, Otiorhynchus sulcatus Fab., developing on container grown rhododendrons. The addition of the insecticide acephate, (O.S.- Dimethyl acetylphosphoramidothioate, Orthene®)75S) to the rhizosphere of rhododendrons in which larval O. sulcatus develop was categorized as a density-independent...
Resource Type:: Masters Thesis
Full Text:: sulcatus Fab., ON CONTAINER GROWN RHODODENDRONS. Abstract approved: Redacted for Privacy ) Richard G

Creator:: Suharto, Hendarsih
Abstract:: The relationship between pea enation mosaic virus (PEMV) and aging pea aphids was studied. Although this research initially emphasized the relationship between the decline in the rate of PEMV transmission and the 'concentration of PEMV within pea aphids, aphid age was found to be the principle factor influencing transmission. Enzymelinked...
Resource Type:: Masters Thesis
Full Text:: sincere gratitude to my major professor, Dr. Richard G. Clarke, for his encouragement, guidance

Creator:: Eulensen, Gustav Egon
Abstract:: The transmission of strawberry mottle virus (SMV) to Fragaria vesca L. by Chaetosiphon thomasi and C. fragaefolii was studied to determine differences between the two species. Acquisition, inoculation, and retention phases of transmission were described. In all phases, C. fragaefolii was found to be the more efficient vector. Mean transmission...
Resource Type:: Masters Thesis
Full Text:: and Chaetosiphon fragaefolii (Cockerell) Abstract approved: Redacted for Privacy Richard G. Clarke

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