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Creator:: Harwood, Steven Hunter
Abstract:: The toxicity of menthol, menthone, pulegone, limonene, and a-pinene, five monoterpenes found in peppermint (Mentha piperita L.), to the variegated cutworm (Peridroma saucia Hiibner) was characterized by in vivo and in vitro methods. Pulegone and menthone caused slower growth over six days when incorporated into an artificial diet and fed...
Resource Type:: Masters Thesis
Full Text:: -processed by the author ACKNOWLEDGEMENTS I wish to thank my major professor, Dr. Ralph Berry, for his

Creator:: Groth, Eric M.
Abstract:: Pergamasus quisquiliarum Canestini is a polyphagous predatory mite that has been shown to feed on the economically important arthropod, Scutigerella immaculata Newport (Symphyla: Scutigerellidae), Collembola, Diptera larvae, Enchytraeid worms, and miscellaneous other soil organisms. This study examined the feeding behavior of P. quisquiliarum, the effects of cover cropping and tillage...
Resource Type:: Masters Thesis
Full Text:: quisquiliarum Canestrini (Acari: Mesostigmata). Abstract approved: / Ralph E. Be Pergamasus quisquiliarum

Creator:: Russell, Malcolm Howard
Resource Type:: Masters Thesis
Full Text:: OF INSECT SEED - PREDATORS IN CONIFEROUS FORESTS Abstract approved: Redacted for Privacy f Ralph E

Creator:: Puls, Karl A.
Resource Type:: Masters Thesis
Full Text:: . 1984), with mortality reaching 100% in 5 of 7 organophosphate compounds tested. Wilkinson et al

Creator:: Isaacson, Dennis
Abstract:: The dynamics of a field population of the cinnabar moth, Tyria jacobaeae L., were studied near Jordan, Linn County, Oregon. In both 1970 and 1971 larval populations were so large that all foliage of the host weed, tansy ragwort, Senecio jacobaea L., was consumed. The ensuing starvation accounted for the...
Resource Type:: Masters Thesis
Full Text:: cooperation in the conduct of this study. Dr. Ralph E. Berry, Assistant Professor of Entomology, Oregon

Creator:: Oester, Paul T.
Abstract:: Three sympatric species of Ips, colonizing Sitka spruce, were investigated with regard to their infestation habits, stridulating apparatus and acoustic signals. The above phenomena are evaluated qualitatively and/or quantitatively and the acoustic signal differences are proposed as a possible factor for maintaining species isolation, although function is not shown. Field...
Resource Type:: Masters Thesis
Full Text:: , for the helpful advice and guidance he gave throughout this study; Dr. Ralph E. Berry, Associate

Creator:: Dogan, Elif Barçin
Resource Type:: Masters Thesis
Full Text:: owed to my co-major professors, Dr. Philippe A. Rossignol and Dr. Ralph E. Berry. Without their

Creator:: Carmean, David
Abstract:: The known biology of Bareogonalos canadensis (Harrington) is based on literature records of six collections from three areas in the Pacific Northwest. The objective of this study was to obtain fundamental knowledge on the biology of B. canadensis, especially its distribution, abundance, and host species, as well as its potential...
Resource Type:: Masters Thesis
Full Text:: opportunity and encouragement to study yellowjackets as well as his continued interest in my work. Ralph

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