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Filtering by: Creator Jaeger, William K. Remove constraint Creator: Jaeger, William K. Subject Herbicides Remove constraint Subject: Herbicides

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  • Bioherbicide use of plant defensive compounds in meadowfoam seed meal

    Creator:
    Intanon, Suphannika
    Abstract:
    Meadowfoam (Limnanthes alba Hartw. ex Benth) seed meal (MSM), a by-product of meadowfoam oil extraction, has a plant defensive compound known as glucosinolate glucolimnanthin (GLN). Myrosinase enzymes present in soil microbes and meadowfoam seeds can convert GLN to glucosinolate breakdown products (GBPs), which demonstrate herbicidal activity and have the potential...
    Resource Type:
    Dissertation

  • Foliar vs. root uptake of the herbicide Hoe 23408 in Italian ryegrass and wild oats

    Creator:
    West, Geralyn Marie
    Abstract:
    HOE 23408 [methyl 2-[ 4-( 2, 4- dichlorophenoxy )phenoxy]propanoate] is a herbicide used to selectively-control Italian ryegrass (Lolium muitiflorum Lam.) and wild oats (Avena fatua L.) in wheat. The objective of this research was to compare the relative importance of foliar and root uptake of the herbicide in these two...
    Resource Type:
    Masters Thesis

  • The herbicide HOE 23408; soil persistence, spring wheat cultivar tolerance, and interaction with broadleaf herbicides

    Creator:
    Ivackovich, Branislav D.
    Abstract:
    HOE 23408 [ 4-(2' , 4'-dichlorophenoxy)-phenoxy-u-propionic methylester.1 is a promising new compound for control of wild oats and other grass weeds in small grains. Several factors influencing its use for this purpose were investigated. Greenhouse bioassay studies were conducted in 1975 to determine relative persistence of HOE 23408 in four...
    Resource Type:
    Masters Thesis
    Full Text:
    . I am grateful to Dr. Kenton L. Chambers and Dr. William 0. Lee for serving on my committee and

  • 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:
    preparation of the manuscript. I am grateful to Dr. Ronald J. Burr, Dr. William W. Chilcote and Dr. Lyall

  • Differential sensitivity of two common groundsel biotypes (Senecio vulgaris L.) to several s-triazine herbicides

    Creator:
    Radosevich, Steven R.
    Abstract:
    Studies were initiated to determine the response of two common groundsel biotypes (Senecio vulgaris L. ) to several s-triazine herbicides. Herbicides tested were: 2-chloro-4,6-bis(ethylamino)-striazine (simazine), 2-chloro-4-(ethylamino)-6-(isopropylamino)- s-triazine (atrazine) 2-(sec-butylamino)-4-(ethylamino)-6-methoxys- triazine (GS-14254), 2, 4-bis(isopropylamino)-6-methoxy-striazine (prometone), 2-(tert-butylamino)-4-(ethylamino)-6-methylthio- s-triazine (terbutryn), and 2, 4-bis(isopropylamino)-6- methylthio-s-triazine (prometryne). One biotype was much more susceptible than the...
    Resource Type:
    Dissertation
    Full Text:
    . Appreciation is also extended to Dr. William R. Furtick, Department of Agronomic Crop Science, Dr. Larry

  • Chemical and physical factors in the kinetics of herbicide penetration into plants

    Creator:
    López, Hernán
    Abstract:
    Penetration has long been recognized as an important factor in the action of chemicals on plants. The effectiveness of herbicides on such plants as blackberries is often thought to be limited by the failure to obtain adequate penetration through the cuticular barrier. A number of factors, among them relative humidity,...
    Resource Type:
    Dissertation
    Full Text:
    Privacy Tlr Virgil T-T rpwel Redacted for Privacy Dr. William R. Furtick Penetration has long been

  • Interaction between glyphosate and certain s-triazine herbicides

    Creator:
    Somabhi, Montien
    Abstract:
    Investigations were made in the field, greenhouse, growth chamber, and laboratory to: (a) observe the general activity of N- (phosphonomethyl)glycine (glyphosate); (b) determine the extent of its interaction with certain s-triazine herbicides; and (c) find an explanation for such an interaction. Greenhouse and growth chamber studies substantiated other observations that...
    Resource Type:
    Dissertation
    Full Text:
    laboratory facilities. To Dr. William Furtick, Dr. Lyall F. Taylor, and Dr. Juan Cardenas for their

  • How Oregon farmers select and use herbicides on wheat

    Creator:
    Fine, Richard Ray, 1939-
    Abstract:
    Questionnaires were used in a survey of Oregon farmers to determine how they select and use herbicides on wheat. Farmer's decisions were evaluated on the basis of their ability to: select the proper herbicide treatment for their weed problem and to make application at the proper time. Questionnaire scores indicated...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: Redacted for privacy Dr. William Furtick Questionnaires were used in a survey of

  • Stimulation of plant growth by sub-lethal concentrations of herbicides

    Creator:
    Wiedman, Steven John
    Abstract:
    Studies were conducted to determine the extent and nature of sub-lethal effects of herbicides on plant growth. At least one herbicide from each major chemical class of herbicides was evaluated under greenhouse conditions. Oat plants were grown in sand culture to eliminate soil interferences. Herbicides were applied pre-emergence in nutrient...
    Resource Type:
    Dissertation
    Full Text:
    ,..k)* 114.8 118.1* 117.3* 110.5 88.9 trifluralin 3 100 6.3 24.0 79.0 60. 1 100.9 81.8 130. 1 89. 1

  • The effect of 2,4'-dinitro-4-trifluoromethyldiphenylether (C-6989) on beans (Phaseolus vulgaris L.) under certain soil and light conditions

    Creator:
    Pollak, Tomas
    Abstract:
    Oregon is the largest producer of green beans for processing in the United States. Because the repeated use of a single herbicide may lead to changes in the weed population, build up of residues, and other undesirable factors, a continuous search for new herbicides is taking place. C-6989¹[superscript /] has...
    Resource Type:
    Masters Thesis
    Full Text:
    L.) UNDER CERTAIN SOIL AND LIGHT coNnTrTnNs Redacted for PrivacyAbstract approved: Dr. William R