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  • 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
    Full Text:
    : Arnold P. Appleb,r '.1 HOE 23408 [methyl 2-[ 4-( 2, 4- dichlorophenoxy )phenoxy]propanoate] is a

  • 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:
    . Photosynthesis was completely inhibited by simazine in susceptible (S) plants but resistant (R) plants were

  • Foliage applications of terbacil to peppermint (Mentha piperita) and several weed species

    Creator:
    Radosevich, Steven R.
    Abstract:
    Several studies were conducted to determine the feasibility of using terbacil (3-tert-butyl-5-chloro-6-methyluracil) postemergence to weeds and peppermint (Mentha piperita L.). Three nonionic surfactants, four nonphytotoxic oils, and a liquid fertilizer were each combined with 0.5 lb ai/A terbacil in 35 gallons of water per acre. Weed species tested include: redroot...
    Resource Type:
    Masters Thesis
    Full Text:
    Date thesis is presented L-C 7 Typed by Judith A. Gariepy forteven R. Radosevich ACKNOWLEDGEMENTS

  • Factors affecting selective weedy rye (Secale sp.) control in winter wheat with the herbicide ethiazin

    Creator:
    Diener, Phillip R.
    Abstract:
    Weedy rye (Secale spp.) is a weed in the winter-wheat- growing regions in the Pacific Northwest and surrounding regions. Ethiazin (4-amino-6-(1,1-dimethylethyl)-3- (ehtylthio)-1,2,4-triazine-5 (4H)-one) has shown selective control of weedy rye in the cultivar 'Stephens', (Triticum aestivum). Field, greenhouse, and outdoor pot experiments were conducted to determine factors influencing selectivity. Field...
    Resource Type:
    Masters Thesis
    Full Text:
    .) control in winter wheat with the herbicide ethiazin AN ABSTRACT OF THE THESIS OF Phillip R. Diener for

  • 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:
    reviewing this manuscript and serving on my committee. Dr. R. Wrolstad and Dr. P. Bottomley for reviewing

  • 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:
    Redacted for Privacy r, Dean of Gradu e :j School Date thesis is presented April 26, 1985 Typed by

  • Dinitroaniline-herbicide resistance in goosegrass (Eleusine indica) : ecophysiological aspects

    Creator:
    Valverde, Bernal E.
    Abstract:
    Growth of individual goosegrass (Eleusine indica (L) Gaertn.) plants of three dinitroaniline-herbicide resistant (R) and three susceptible (S) biotypes from North Carolina, South Carolina, and Mississippi was analyzed in greenhouse experiments. Leaf area and biomass measurements, including root, shoot, above-ground, and total dry weights were similar among the biotypes studied....
    Resource Type:
    Dissertation
    Full Text:
    demonstrated that S-biotypes are usually more competitive than R-biotypes (19). Conard and Radosevich (3) and

  • The influence of herbicide placement in soil on toxicity to emerging seedlings

    Creator:
    Nishimoto, R. K. (Roy Katsuto), 1944-
    Abstract:
    Previous research has indicated several soil-applied herbicides are more effective by exposure to emerging shoots than from root uptake. Studies were conducted in the greenhouse and growth chamber to investigate effects of herbicide placement in soil on toxicity to emerging seedlings. In these studies, an inch of treated soil was...
    Resource Type:
    Masters Thesis
    Full Text:
    bromacil (5- bromo -3- sec -butyl -6- methyluracil), R 11913, 1 Nia 11092 (1, 1- dimethyl- 3 -(3 -[ N

  • The response of tomatoes to atrazine as affected by magnesium and photoperiod

    Creator:
    Brenchley, Ronald Glenn
    Abstract:
    Studies were conducted to determine the nature of the interaction between atrazine (2-chloro-4-ethylamino-6-isopropylaminos- triazine) and magnesium on tomatoes. This interaction was studied under two light regimes: continuous light and a 12-hour photoperiod. Tomato plants were grown in sand cultures at three levels of magnesium fertilization. Four weeks after planting, atrazine...
    Resource Type:
    Dissertation
    Full Text:
    . William W. Chilcote, W. R. Furtick, and Frank H. Smith for serving as members of the graduate committee

  • Control of purple nutsedge (Cyperus rotundus L.) with glyphosate

    Creator:
    Chase, Richard Lyle
    Resource Type:
    Dissertation
    Full Text:
    throughout my doctoral program. Thanks are also extended to S. C. Fang, R. L. Stebbins, W. W. Chilcote, and