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Effects of early season immigration on acaricide resistance of Tetranychus urticae Koch on strawberry in the California Pajaro and Salinas valleys

Creator:: Miller, Richard W. (Richard William), 1958-
Abstract:: In the Pajaro Valley near Watsonville, California, twospotted spider mite (Tetranychus urticae Koch) populations were surveyed in 1983 and '84 to detect the influence of immigrants from nursery plants or surrounding vegetation on subsequent resistance development to cyhexatin and formetanate in strawberry fields. Susceptible mites (cyhexatin LC50 = 0.0039 %...
Resource Type:: Masters Thesis
Full Text:: OF THE THESIS OF Richard W. Miller for the degree of Master of Science in Entomology presented on

Examination of factors affecting larval mortality of the black vine weevil, Otiorhynchus sulcatus Fab., on container grown rhododendrons

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

Seasonal activities of two species of eriophyid mites on holly and their relation to foliage damage

Creator:: Welton, Richard Elroy
Resource Type:: Masters Thesis
Full Text:: HOLLY AND THEIR RELATION TO FOLIAGE DAMAGE by RICHARD ELROY WELTON A THESIS submitted to

The transfer of ringspot viruses by the pea aphid, Macrosiphum pisi (Kltb.)

Creator:: Amen, Clark Richard
Resource Type:: Masters Thesis
Full Text:: CLA.RK RICHARD AÎ4EN A THI!SIS submitted to OREGON STATE COLLEGE in partial fulfillment of the

A study of ticks (Acarina: Ixodidae) and chiggers (Trombiculidae) from two areas in western Oregon

Creator:: Easton, Emmett Richard
Abstract:: A study of the host range and distribution of ticks and chiggers (Acari) was undertaken in two contrasting forested areas of western Oregon. Acarines were sampled from host mammals which were trapped along line transects laid out in both areas, each consisting of 18 stations 50 feet apart. Hosts were...
Resource Type:: Dissertation
Full Text:: (Trombiculidae) from two areas in western Oregon AN ABSTRACT OF THE THESIS OF EMMETT RICHARD EASTON for the

The Thysanoptera of Oregon

Creator:: Post, Richard Lewis
Resource Type:: Dissertation
Full Text:: by RICHARD LETIS POST A THESIS submitted to OREGON STATE COLLEGE in partial fulfillment of

The effect of competition on the population dynamics of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk., in Oregon

Creator:: Schmitz, Richard Franklin
Abstract:: The effect of competition on the brood survival of the Douglas fir beetle Dendroctonus pseudotsugae Hopkins, in down or windthrown Douglas-fir Pseudotsuga menziesii (Mirb.) Franco was studied in the field and the laboratory. The investigation of the role of competition in the population dynamics of the beetle had four objectives:...
Resource Type:: Masters Thesis
Full Text:: RICHARD FRANKLIN SCHMITZ for the M. S. in Entomology ----~--~~~--(Name) (Degree) (Major) Date thesis is

Biological interrelationships between the Ambrosia beetle Xyleborus dispar with its symbiotic fungus Ambrosiella hartigii

Creator:: French, John Richard Joseph
Abstract:: Biological interrelationships between the ambrosia beetle Xyleborus dispar (F.) (Coleoptera:Scolytidae) with its symbiotic fungus, Ambrosiella hartigii Batra (Fungi Imperfecti) were investigated in western Oregon. Postdiapause adults of X. dispar collected in March through June with rotary nets, and excised from overwintered and newly attacked host material, produced a single generation...
Resource Type:: Dissertation
Full Text:: Xyleborus dispar and its symbiotic fungus Ambrosiella hartigii AN ABSTRACT OF THE THESIS OF JOHN RICHARD

Susceptibility of peas to aphid inoculation with bean yellow mosaic virus

Creator:: Welton, R. E. (Richard Elroy)
Abstract:: The effects of soil moisture, mineral nutrition and temperature on the susceptibility of peas to inoculation with bean yellow mosaic virus (BYMV) by the green peach aphid, Myzus persicae (Sulz.) were investigated along with three vector-virus relationships. In addition, a comparative study was made of two methods of evaluating susceptibility...
Resource Type:: Dissertation
Full Text:: yellow mosaic virus AN ABSTRACT OF THE THESIS OF Richard Elroy Weltnn for the Ph. D. in Entomology

Toxicity of some commonly used pesticides to Trioxys Pallidus and its establishment in filbert orchards of Willamette Valley

Creator:: Saeed, Mohammad
Abstract:: A parasitic wasp, Trioxys pallidus Haliday (Hymenoptera: Aphidiidae) was imported from Europe and initially released against the filbert aphid Mvzocallis coryli (Goetze) in hazelnut (filbert) orchards of the Willamette Valley, Oregon beginning in 1984. In the present study, I investigated the establishment rates of this parasitoid. A total of 13...
Resource Type:: Masters Thesis
Full Text:: per year) and carbaryl (1 spray per year) since 1985, were collected near Corvallis, Benton County

ScholarsArchive@OSU

Effects of early season immigration on acaricide resistance of Tetranychus urticae Koch on strawberry in the California Pajaro and Salinas valleys

Examination of factors affecting larval mortality of the black vine weevil, Otiorhynchus sulcatus Fab., on container grown rhododendrons

Seasonal activities of two species of eriophyid mites on holly and their relation to foliage damage

The transfer of ringspot viruses by the pea aphid, Macrosiphum pisi (Kltb.)

A study of ticks (Acarina: Ixodidae) and chiggers (Trombiculidae) from two areas in western Oregon

The Thysanoptera of Oregon

The effect of competition on the population dynamics of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk., in Oregon

Biological interrelationships between the Ambrosia beetle Xyleborus dispar with its symbiotic fungus Ambrosiella hartigii

Susceptibility of peas to aphid inoculation with bean yellow mosaic virus

Toxicity of some commonly used pesticides to Trioxys Pallidus and its establishment in filbert orchards of Willamette Valley

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