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  • Non-herbicidal effects of dinoseb on winter wheat yields

    Creator:
    Valverde, Bernal E.
    Abstract:
    A series of experiments were conducted from 1983 to 1985 to determine the effects of dinoseb [2-(1-methylpropyl)-4,6-dinitrophenol] on winter wheat (Triticum aestivum L. em Thell) yields. Field trials on dinoseb timing and dinoseb plus supplemental pesticides were established in an effort to elucidate the possible factors involved in the yield...
    Resource Type:
    Masters Thesis
    Full Text:
    height and tiller number, and decreased tiller weight. It also increased eyespot attack. Benomyl was

  • 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:
    for a number of s-triazine herbicides (3, 4, 26). 36 Appendix Table 1. Fresh weight and dry weight

  • Factors influencing metribuzin use in strip-planted wheat

    Creator:
    Zeghida, Ali
    Abstract:
    Equipment for strip-till planting is under development in wheat-fallow rotations in the Columbia Basin of Oregon. This involves the absence of tillage during the fallow season. At planting time, the strip-till planter creates a narrow band into which the wheat seed is placed. The area between the rows is undisturbed...
    Resource Type:
    Masters Thesis
    Full Text:
    Solution 32 than when it was used alone. Solution 32 was used at 0, 36, 54, and 79 kg N/ha, and metribuzin

  • 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 plants increased the number of new shoots produced by the weed when the herbicide was

  • The reproduction and mode of spread of sago pondweed (Potamogeton pectinatus L.) in irrigation system

    Creator:
    Ogg, Alex G.
    Abstract:
    Nine experiments were conducted during 1964 and 1965 to study the methods of reproduction and mode of spread of sago pondweed (Potamogeton pectinatus) in irrigation systems. Frequent treatments of sago pondweed foliage with aromatic solvent greatly reduced the number of tubers in the substratum of an irrigation canal. However, complete...
    Resource Type:
    Masters Thesis
    Full Text:
    . Frequent treatments of sago pondweed foliage with aromatic solvent greatly reduced the number of tubers

  • An evaluation of weed interference in rice grown on hydromorphic soils in West Africa

    Creator:
    Diop, Amadou Makhtar
    Abstract:
    Field, screenhouse, and laboratory experiments were conducted to study weed interference in rice grown on hydromorphic soils at the International Institute of Tropical Agriculture (IITA) at Ibadan, Nigeria. Rice and weeds emerged at the same time, 1 week after planting. Weed dry weight was significantly reduced when the crop was...
    Resource Type:
    Dissertation
    Full Text:
    . Season-long weed competition reduced rice grain yield by 73%. Weed competition reduced the number of

  • 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:
    field studies, glyphosate controlled foliage growth at most growth stages. Number and weight of new

  • Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

    Creator:
    Geddens, Ray M.
    Abstract:
    Eight postemergence herbicides were evaluated to determine their influence on the incidence and severity of take-all disease caused by the fungus Gaeumannomyces graminis var. tritici in winter wheat. Mecoprop ((+)-2-(4-chloro-2-methylphenoxy)propanoic acid), difenzoquat (1,2- dimethyl- 3,5- diphenyl -1H- pyrazolium), dinoseb amine (amine salt of 2-(1-methylpropy1)-4,6-dinitrophenol), and diclofopmethyl (methyl ester of (+)-2-[4-(2,4-dichlorophenoxy)...
    Resource Type:
    Dissertation
    Full Text:
    . Higher rates of this herbicide, however, occasionally increased disease severity. The number of seminal

  • Biology and control of tuber oatgrass (Arrhenatherum elatius (L.) presl. var. Bulbosum (willd.) spenn.)

    Creator:
    Tanphiphat, Karin
    Abstract:
    Tuber oatgrass (Arrhenatherum elatius (L.) Presl. var. bulbosum (Willd.) Spenn.) is a perennial grass that often becomes a weed problem in Western Oregon. Control efforts using glyphosate often give unsatisfactory results. The effects of several factors on development of tuber oatgrass were investigated. Long days and cool temperatures (16/8h, 20/10C...
    Resource Type:
    Dissertation
    Full Text:
    . Initial germination was delayed at 8 and 25C. The total total number of corms that sprouted was the

  • 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:
    biomass, and culm number of wheat increased with increasing rye control. Greenhouse and outdoor pot