Search Constraints

Start Over
Filtering by: Creator Dale, A. C. Remove constraint Creator: Dale, A. C. Advisor Appleby, Arnold P. Remove constraint Advisor: Appleby, Arnold P.

Search Results

  • Effects of lactofen herbicide on cellular uptake of glyphosate herbicide in malva parviflora L.

    Creator:
    Wells, Barbara Heard
    Abstract:
    Time-course growth chamber studies were conducted on little mallow (Malva parviflora L.) to determine whether sublethal doses of lactofen (1'-(carboethoxy)ethyl-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2- nitrobenzoate) would enhance uptake of glyphosate (N'-(phosphonomethyl) glycine) by altering membrane permeability. Lactofen-induced membrane peroxidation was determined by harvesting leaf discs, measuring stress ethylene evolution, and recording increases in...
    Resource Type:
    Dissertation
    Full Text:
    when glyphosate was applied alone or in combination with lactofen. The cuticle therefore was not a

  • 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:
    stimulated more often and to a greater degree than were shoots. Herbicides stimulating root growth were

  • 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:
    -Phosphonomethyl Glycine by Enrique C. Paller A THESIS submitted to Oregon State University in partial

  • 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:
    . BEHAVIOR OF METRIBUZIN AND ETHYL-METRIBUZIN IN SOIL by Daniel C. Peek A THESIS submitted to Oregon

  • 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:
    evaporation. Cycloate has a vapor pressure of 6.2 x 10-3 at 25 C as compared to diuron which has a vapor

  • Germination and growth characteristics of five accessions of jointed goatgrass (Aegilops cylindrica)

    Creator:
    Gleichsner, Jean A.
    Abstract:
    Laboratory and field studies were conducted at Pendleton, Oregon, during 1983 and 1984 to evaluate germination and growth characteristics of five jointed goatgrass (Aegilops cylindrica Host) accessions collected from sites in Echo, Ione, Pendleton, Condon, and Elgin, Oregon. Spikelets were germinated for 27 days at room (23 +̲ 2 C)...
    Resource Type:
    Masters Thesis
    Full Text:
    percentage generally increased within a storage length as the temperature was raised from 7 to 29 C. No

  • 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:
    encouragement received from Drs. A. P. Appleby and T. C. Allen. The author appreciates the valuable technical

  • 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:
    for privacy Arnold P. iffprgeby Tansy ragwort (Senecio jacobaea L. ) is a poisonous weed which

  • 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:
    activity of glyphosate. Objective (a) is addressed in Section I. Objectives (b) and (c) are addressed in