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Filtering by: Creator Borum, C. J. Remove constraint Creator: Borum, C. J. Advisor Appleby, Arnold P. Remove constraint Advisor: Appleby, Arnold P.

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  • Influence of weed density on efficacy of two soil-applied herbicides

    Creator:
    Burrill, L. C.
    Abstract:
    Several studies were conducted to determine the effect of weed density on herbicide efficacy. Diuron [3-(3, 4- dichlorophenyl) -1, 1- dimethylurea] was tested on various densities of Italian ryegrass (Lolium multiflorum Lam. ) under greenhouse and field conditions. Cycloate (S-ethyl N-ethylthiocyclohexanecarbamate) was tested on green foxtail (Setaria viridis (L. )...
    Resource Type:
    Masters Thesis
    Full Text:
    presented Typed by Mary Jo Stratton for Larry C. Burrill ACKNOWLEDGEMENTS I wish to express my sincere

  • The effects of N-1-Naphthylphthalamic acid on growth of yellow nutsedge and its control with N-Phosphonomethyl glycine

    Creator:
    Paller, Enrique C.
    Abstract:
    Greenhouse and growth chamber experiments were conducted with the following objectives: (a) to study the effects of N-1-naphthylphthalamic acid (naptalam) on shoot and tuber production, rhizome transformation, and growth of yellow nutsedge (Cyperus esculentus L.) plants; (b) to study the effects of N-phosphonomethyl glycine (glyphosate) on nutsedge plants at different...
    Resource Type:
    Dissertation
    Full Text:
    yellow nutsedge and its control with n-phosphonomethyl glycine AN ABSTRACT OF THE THESIS OF ENRIQUE C

  • Behavior of metribuzin and ethylmetribuzin in soil

    Creator:
    Peek, Daniel C.
    Abstract:
    The behavior of metribuzin [4-amino-6-(1,1- dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] and ethyl-metribuzin (4-amino-6-(1,1-dimethylethyl)-3- (ethylthio)-1,2,4-triazin-5(4H)-one] in soil was studied to determine if differences in herbicide behavior in soil could explain (a) the inconsistent herbicidal activity of these chemicals and (b) the greater activity of metribuzin, as compared to ethyl-metribuzin. Metribuzin had higher activity than ethyl-metribuzin...
    Resource Type:
    Dissertation
    Full Text:
    . Soc. Am. J. 49:583-586. 27 16. Peter, C. J. and J. B. Weber. 1985. Adsorption, mobility, and

  • Tobacco rattle virus : weed hosts, diagnosis, characterization, purification, and interaction with potato virus X

    Creator:
    Locatelli, Eduardo Atilio
    Abstract:
    A series of studies was conducted to determine the presence of tobacco rattle virus (TRV), potato virus X (PVX), and other viruses in wild plants and to evaluate the efficacy of the detection methods; to characterize and purify an isolate of TRV; and to study the interaction between TRV and...
    Resource Type:
    Dissertation
    Full Text:
    INTERACTION WITH POTATO VIRUS X Redacted for Privacy -Redacted for Privacy Arnow F. Applo.el?y r Inomas C

  • Sethoxydim herbicide in red fescue and bentgrass : levels and mechanisms of selectivity

    Creator:
    Butler, J. Hugh B.
    Abstract:
    The herbicide rate required to reduce growth by 50% (GR₅₀) of 11 cultivars of red fesue (Festuca rubra L. and F. rubra ssp. commutata) and for four cultivars of bentgrass (Agrostis tenuis Sibth. and A. stolonifera L. var. palustris) to sethoxydim (2-[1-(ethoxyimino) butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one) was determined in greenhouse and laboratory experiments....
    Resource Type:
    Dissertation
    Full Text:
    and mechanisms of selectivity AN ABSTRACT OF THE THESIS OF J. Hugh B. Butler for the degree of

  • Asulam for tansy ragwort control in alfalfa : field efficacy and selectivity factors

    Creator:
    Harper, Delbert Ray
    Abstract:
    Tansy ragwort (Senecio jacobaea L. ) is a poisonous weed which infests alfalfa fields in western Oregon. Studies were conducted to evaluate the effectiveness of asulam (methyl sulfanilylcarbamate)for control of tansy ragwort in alfalfa and to elucidate factors responsible for its selectivity. In seven replicated field trials in 1973 and...
    Resource Type:
    Dissertation
    Full Text:
    extended to Dr. Thomas C. Moore, Dr. W. W. Chilcote and Dr. Michael C. Mix for serving on my committee

  • Comparisons of morphology and susceptibility to herbicides of two yellow nutsedge (Cyperus esculentus L.) varieties

    Creator:
    Costa, Jaime
    Resource Type:
    Masters Thesis
    Full Text:
    . Ronald J. Burr for serving on my graduate committee and reviewing this thesis. My thanks to the

  • Interference of annual weeds in seedling alfalfa

    Creator:
    Fischer, Albert J.
    Abstract:
    The interference of barnyardgrass (Echinochloa crusgalli), pigweed (Amaranthus retroflexus),downy brome (Bromus tectorum),and tumble mustard (Sisymbrium altissimum) with alfalfa was studied. Alfalfa was seeded with each of the four weeds on August 14 and September 15, 1981, and on April 13, 1982. Alfalfa also was seeded on August 27, 1981, with...
    Resource Type:
    Masters Thesis
    Full Text:
    ANNUAL WEEDS IN SEEDLING ALFALFA by Albert J. Fischer A THESIS submitted to Oregon State University

  • Factors influencing the effectiveness of activated carbon used to protect newly-seeded grasses from herbicides

    Creator:
    Burr, Ronald J.
    Abstract:
    Previous research has shown that activated carbon is effective in inactivating certain herbicides applied as a preemergence treatment. Studies were conducted in the greenhouse to determine the influence of various factors on the ability of activated carbon to inactivate herbicides applied after carbon application. Field studies were conducted to determine...
    Resource Type:
    Masters Thesis
    Full Text:
    -a:2', 1'- c)pyrazidiinium (diquat) and 1, 1 -dimethy1-4, 4'-bipyridinium (paraquat), were

  • Factors influencing wild oat control with N-benzoyl-N-(3,4-dichlorophenyl) alanine (SD 30053)

    Creator:
    Colbert, Donald Robert
    Abstract:
    Studies were conducted in 1969 and 1970 to evaluate the effectiveness of an experimental herbicide, SD 30053 (alanine, N-benzoyl-N-(3, 4-dichlorophenyl)-, ethyl ester), for wild oat (Avena fatua L.) control in winter cereals. The 1969 field studies showed that postemergence applications of SD 30053 were effective in controlling wild oats. Wild...
    Resource Type:
    Masters Thesis
    Full Text:
    the preparation of this manuscript. I am grateful to Dr. Ronald J. Burr, Department of Agronomic