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Dissertations / Theses on the topic 'Wheat Diseases and pests Cultural control'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Gaongalelwe, Motlhasedi Olebile. "Effect of delayed sowing and increased crop density on weed emergence and competition with wheat." Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09AFM/09afmg2118.pdf.

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2

Dyer, Sonya. "The role of colonisation of soil and wheat roots by Trichoderma koningii in biological control of Gaeumannomyces graminis var. tritici." Title page, table of contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phd9966.pdf.

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3

Wiseman, Bronwyn Meg. "Characterisation of rhizoctonia barepatch decline." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phw8137.pdf.

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Bibliography: leaves 184-209. This thesis describes the occurence of natural, biologically based suppression of Rhizoctonia barepatch in a direct drilled system at Avon, South Australia. The supressive characteristics are transferable, removed by biocidal treatments, and active against increasing doses of R. solani AG-8, Gaeumannomyces graminis var. tritici and Fusarium graminearum. Disease severity and the viable population of Rhizoctonia are reduced in suppressive soil but the causal agent is still present. The microbial populations in suppressive and non-suppressive soil appear to differ bo

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4

Bahlmann, Lieschen. "Factors affecting the resistance mechanisms of the Russian wheat aphid (Diuraphis noxia) on wheat." Diss., University of Pretoria, 2002. http://hdl.handle.net/2263/28470.

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5

Ross, Ian Lindsay. "Mechanisms of biocontrol of Gaeumannomyces graminis var. tritici by Pseudomonas corrugata strain 2140 : genetic and biochemical aspects." Title page, table of contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phr824.pdf.

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Bibliography: leaves 207-220. Pseudomonas corrigata strain 2140 (Pc2140), isolated from wheat field soil in Australia, antagonises the take-all fungus, Gaeumannomyces graminis var. tritici (Ggt) in vitro and significantly reduces take-all symptoms on wheat in pot trials. This study investigates the mechanisms by which the biocontrol agent reduces the disease symptoms. Biochemical analysis of metabolites of P. corrugata 2140 reveal a number of compounds potentially antagonistic to Ggt and which may play a role in disease control. These include water-soluble antibiotics, siderophores, proteases,

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6

Bujold, Isabelle. "The use of a fungal antagonist to reduce the initial inoculum of Gibberella zeae on wheat and corn debris /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31199.

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Gibberella zeae (anamorph: Fusarium graminearum) is the causal agent of fusarium head blight (FHB) and maize ear rot, two major diseases of wheat and corn in Eastern Canada.<br>In Quebec, Microsphaeropsis sp., an antagonist of Venturia inaequalis, the causal agent of apple scab, was isolated from the apple leaf litter. This fungus, well adapted to Quebec climate, can reduce the initial inoculum of V. inaequalis. FHB and Gibberella ear rot are similar to apple scab because the major inoculum source comes from melanized structures produced on crop residues. Consequently, we evaluated the potenti

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7

Eksteen, Aletta. "Ontwikkeling van molekulere merkers vir wilde-spesie-verhaalde weerstandsgeenkomplekse van gewone koring." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2087.

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Thesis (MSc (Genetics))--University of Stellenbosch, 2009.<br>Worldwide, the rust diseases cause significant annual wheat yield losses (Wallwork 1992; Chrispeels & Sadava 1994). The utilization of host plant resistance to reduce such losses is of great importance particularly because biological control avoids the negative environmental impact of agricultural chemicals (Dedryver et al. 1996). The wild relatives of wheat are a ready source of genes for resistance to disease and insect pests. A large degree of gene synteny still exists among wheat and its wild relatives (Newbury & Paterson 2003).

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8

Yaku, Alexander. "Effects of intercropping sweet potato on the population density of sweet potato weevil, Cylas formicarius (F.) (Coleoptera:Curculionidae)." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56673.

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Field experiments were conducted during the 1989 dry season (July to December) at the Manggoapi Farm of the Faculty of Agriculture, Cenderawasih University in Manokwari, Irian Jaya, Indonesia. The objectives of the experiments were to determine the effects of four sweet potato cropping systems on the population density of sweet potato weevils (SPW) and on the diversity of other insects within these agroecosystems.<br>Fewer SPW were found in intercropped sweet potato + corn (2 weevils per kg infected tubers), sweet potato + soybean (21 weevils), sweet potato + corn + soybean (8 weevils) than in

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9

Ntushelo, Khayalethu. "Comparative studies on genetic variability and fungicide resistance in Tapesia yallundae." Thesis, Stellenbosch : Stellenbosch University, 1998. http://hdl.handle.net/10019.1/55834.

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Thesis (MScAgric)--Stellenbosch University, 1998.<br>ENGLISH ABSTRACT: Eyespot is an important disease of spring wheat (Triticum aestivum L.). Four species of Ramulispora are associated with this disease, of which Tapesia yallundae and T. acuformis. are common. This thesis investigates the broader subjects of genetic variability, reproductive dynamics and fungicide resistance in Tapesia yallundae. Each of the chapters treats specific but related topics. T. yallundae, which is the only species thus far reported from South Africa, has been associated with yield losses of up to 50%. To ena

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10

Cooke, Julie A. (Julie Anne). "Nutritional requirement of wheat in relation to tolerance to Rhizoctonia solani Kuhn / by Julie A. Cooke." 2000. http://hdl.handle.net/2440/22467.

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Bibliography: leaves 119-143<br>v, 148 leaves : ill. ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Science, 2000

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11

Cowger, Christina. "Cephalosporium stripe of wheat : seedling-based resistance screening and pathogenic variability." Thesis, 1997. http://hdl.handle.net/1957/33687.

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Cephalosporium stripe of wheat (Triticum aestivum), caused by the soilborne fungus Cephalosporium gramineum, results in significant yield reductions in dryland winter wheat crops of the U.S. Pacific Northwest. The development of resistant cultivars offers the best hope for disease control. Breeding for resistance is hampered by the long trial times inherent in screening adult plants, and by cultivar x environment interactions in field tests. The principal objective of this research was to develop and test a procedure for screening wheat seedlings in controlled environments for resistance to Ce

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12

Mosupi, P. O. P. (Pharoah Olifant Pedro). "Chemical and cultural control of armoured bush cricket, Acanthoplus discoidalis (Walker) (Orthoptera: Tettigoniidae: Hetrodinae), in sorghum in Botswana." Thesis, 2003. http://hdl.handle.net/2263/29424.

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13

Hatting, Justin Louis. "Fungal parasitism of cereal aphids in South Africa." Thesis, 2002. http://hdl.handle.net/10413/10249.

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The Russian wheat aphid, Diuraphis noxia is one of the most destructive exotic invaders of South Africa, capable of reducing individual wheat plant yields by up to 90%. Entomopathogenic fungi are important natural mortality factors associated with this aphid in its Eurasian endemic habitats as well as in the United States and Canada; their impact often exceeding that of predators and parasitoids. The principal objectives of this study included (1) baseline characterization of the aphid-pathogenic flora associated with aphids from South Africa, with special reference to six common cereal aphids

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14

Sibisi, Phumzile Pretty. "The application of potassium phosphate primes wheat against aphid infestation." Thesis, 2014. http://hdl.handle.net/10210/12359.

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M.Sc. (Botany)<br>Wheat is the second most important grain crop produced in South Africa. It is mostly used for human consumption (e.g. biscuits, rusks, breakfast cereals, and bread) with the remainder being used as seed and animal feed. Wheat is also used for production of alcohol for ethanol, absorbing agents for adhesives, disposable diapers and industrial uses as starch on coatings (Department of Agriculture, Forestry and Fisheries, 2011). The leading wheat producing areas in South Africa since 1994 are the Western Cape (38 %), Free State (26 %) and Northern Cape (17 %) (Department of Agri

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15

Ross, Ian L. "Mechanisms of biocontrol of Gaeumannomyces graminis var. tritici by Pseudomonas corrugata strain 2140 : genetic and biochemical aspects / Ian Ross." 1996. http://hdl.handle.net/2440/18760.

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Bibliography: leaves 207-220.<br>220 leaves : ill. ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Pseudomonas corrigata strain 2140 (Pc2140), isolated from wheat field soil in Australia, antagonises the take-all fungus, Gaeumannomyces graminis var. tritici (Ggt) in vitro and significantly reduces take-all symptoms on wheat in pot trials. This study investigates the mechanisms by which the biocontrol agent reduces the disease symptoms. Biochemical analysis of metabolites of P. corrugata 2140 reveal a number of c

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16

Sikhakhane, Thandeka Nokuthula. "Genetics of Russian wheat aphid (Diuraphis noxia) resistance in bread wheat (Triticum aestivum L.) accession CItr 2401." Diss., 2017. http://hdl.handle.net/10500/22961.

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The Russian wheat aphid (RWA) (Diuraphis noxia Kurdjumov) is one of the important insect pests of wheat (Triticum aestivum L.), barley (Hordeum vulgare L.) and other grasses. To date, there are four RWA biotypes identified in South Africa. The virulent biotypes emerged, partly due to climate change and new genetic variations within populations of RWA; hence there is a need to improve host-plant resistance, as an effective control measure. Bread wheat (Triticum aestivum L.) accession Cereal Introduction (CItr) 2401 is known to be resistant to all RWA biotypes worldwide. The goal of this study w

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