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Filtering by: Creator Loehr, C. V. Remove constraint Creator: Loehr, C. V. Contributor advisor sim Appleby, Arnold P. Remove constraint Contributor advisor sim: Appleby, Arnold P.

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  • 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:
    discussions and assistance. To Drs. David 0. Chilcote, Thomas C. Moore, and V. Van Volk for serving as

  • Cyperus esculentus control with glyphosate : time of application and addition of ammonium sulfate

    Creator:
    Costa, Jaime
    Abstract:
    Cyperus esculentus L. var. esculentus is a serious weed problem in northwest Spain. Long-term control from glyphosate and other herbicides has been inconsistent. Field, greenhouse, and laboratory studies were conducted on factors influencing the activity of glyphosate on C. esculentus. In field studies, glyphosate controlled foliage growth at most growth...
    Resource Type:
    Dissertation
    Full Text:
    C 4) .1- S- V/ 4-) 3 CI) S- = 0 - C I W 0 I- S - E .0 S - r- 1 1 3= = 0- 0 Cll= 4-3 en 4- >, 4

  • Effect of a pre-irrigation period on the activity of ethofumesate applied to dry soil

    Creator:
    McAuliffe, David
    Abstract:
    Applications of ethofumesate in Oregon have been observed from previous research and from commercial use to be less effective when applied to dry soils, even if subsequent precipitation occurred within a few days. Two field studies were established in the summer of 1979 using sweet corn (Zea mays L. 'Jubilee')...
    Resource Type:
    Masters Thesis
    Full Text:
    my graduate program. My thanks to Dr. W. Orvid Lee and Dr. V. Van Volk for serving on my graduate

  • 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

  • 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

  • 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:
    . Madison, WI. 15. Peek, D. C. and V. V. Volk. 1985. Fluoride sorption and desorption in soils. Soil Sci

  • 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:
    ) placed as a drop on a grid, or (c) mixed (1:1 v/v) with 5% glutaraldehyde and placed on a grid. After 5

  • 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

  • The effect of 2,4-D on the respiration rate and ethylene production of Bartlett pears and Red Delicious apples

    Creator:
    Fechtig, Allen David
    Abstract:
    After nearly 20 years of commercial use in orchards without apparent tree injury in Oregon and Washington, 2,4-D [(2,4-dichlorophenoxy) acetic acid] was reported in 1970 to cause injury to apple and pear trees in Washington. In the early 1970's, there was widespread concern among growers, researchers, and processors in the...
    Resource Type:
    Dissertation
    Full Text:
    . David Chilcote, C. E. Horner, Thomas C. Moore, and Darwin Reese has been a valuable contribution in

  • Effect of glyphosate when applied to grass and legume seeds or preemergence to bentgrass (Agrostis tenuis Sibth.)

    Creator:
    Salazar, Luis Carlos
    Abstract:
    Paraquat (1,11-dimethy1-4,4'-bipyridinium ion) and glyphosate [N (phosphonomethyl)glycine] are herbicides utilized for chemical seedbed preparation in the establishment of grass and legume seed crops. When these herbicides are applied after seeding the crop, seeds which are not protected by a layer of soil could be exposed to the herbicide. Effects of...
    Resource Type:
    Masters Thesis
    Full Text:
    . Kenton L. Chambers, and Dr. David C. Church for serving on my graduate committee. I am grateful to the