Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"resistant cultivar"”.
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The Spatial and Temporal Distribution and Management of Tomato Bacterial Wilt on Virginia's Eastern Shore
… investigate the effects of tomato bacterial wilt resistant cultivars on the ESV. In 2008 and 2009, the selective, systemic compound which induces host plant resistance, acibenzolar-S-methyl (ASM) was incorporated into resistant cultivar trials. Results from the 2007 trial revealed significant …
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Population Genetics and Differential Pathogenicity of the Soybean Brown Stem Rot Pathogen Phialophora Gregata
… between the genotype and the reaction of soybean cultivar to the pathogen. When the two genotypes were mixed in 1:1 ratio, genotype A isolates preferentially infected the susceptible cultivar Sturdy, whereas genotype B isolates preferentially infected the resistant cultivar Bell. The results are …
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An Integrated Approach for Controlling Verticillium Wilt of Strawberry
… was examined. Further, the integration of a resistant cultivar was also implemented in hopes of further decreasing plant mortality and increasing yield. Different fumigant products such as metam potassium, metam sodium, and chloropicrin were used to assess their performance in different …
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Fusarium in winter wheat: mycotoxin accumulation in straw and a survey of roots
… (QoI) fungicides; ii) the use of a moderately resistant cultivar offered significant control of mycotoxin accumulation in the straw over a susceptible cultivar regardless of whether or not a fungicide was applied; iii) the selection of a moderately resistant cultivar offers effective control of …
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Molecular response of soybean (Glycine max (L.) Merr) to Phialophora gregata
… by the fungus Phialophora gregata. Several cultivars of soybean (Glycine max (L.) Merr.) show levels of resistance to attack by the fungus. In order to determine the mechanism of this resistance, the response of whole plants and soybean cells in culture was studied at the biochemical and …
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Intercropping with resistant cultivars reduces early blight and root knot disease on susceptible cultivars of tomato (Lycopersicon esculentum)
… to determine if disease on susceptible tomato cultivars is reduced by intercropping with resistant cultivars. A second objective was to investigate the mechanism of the disease reduction observed. Early blight (caused by Alternaria solani) rate of disease increase and lesion expansion were …
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Effect of Aldicarb and Resistance on Yield Components of Soybean and Population Dynamics of Cyst Nematode (Heterodera, Illinois, Phomopsis)
Group three soybean cultivars resistant and susceptible to races three and four of Heterodera glycines were grown in three fields in Southern Illinois treated and nontreated with aldicarb and naturally infested with race three of the soybean cyst nematode. Cyst nematode reduced the height of plants …
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Characterizing resistance in flue-cured tobacco to Globodera tabacum solanacearum
… quality of flue-cured tobacco. Root exudate from resistant (NC 567) and susceptible (K 326) flue cured tobacco cultivars had similar effects on hatching of G. t. solanacearum. Dilution of root exudate reduced hatching and hatching appeared to increase with increased temperature. More swollen and …
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The infection process of Colletotrichum truncatum on lentil
… described in detail. Currently, several lentil cultivars, such as CDC Redberry, CDC Robin, CDC Rosetown, CDC Rouleau, and CDC Viceroy, have resistance against race Ct1, whereas there are no cultivars showing resistance to race Ct0. The objective of this study was to investigate differences in …
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The Contribution of Within-Field Inoculum Sources of Gibberella zeae to Fusarium Head Blight in Winter Wheat and Barley
… minimal or conventional tillage and a moderately resistant cultivar of wheat or barley may reduce the contribution of within-field inocula to FHB; however, environmental conditions play an important role in the effectiveness of these management strategies. With the increase of corn production due …
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Investigations Into the Genetic Basis of Resistance to Brown Stem Rot in Soybean
… localize BSR resistance QTL from 'Bell', a resistant cultivar with genetic background from PI 88788; develop a BSR/soybean cyst nematode (SCN) co-inoculation method and examine if SCN increases BSR symptoms in two near isogenic line populations; determine if five resistant accessions from …
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High-Resolution Mapping of the Region around the Soybean Virus Resistance Genes, Rsv1 and Rpv1
… in soybean [Glycine max (L.) Merr.]. Virus resistant soybean cultivars have been released with alleles at the Rsv1 and Rpv1 locus that confer resistance to SMV and PMV, respectively. A high-resolution map-based cloning approach was undertaken to isolate Rsv1 and Rpv1 from soybean, with hopes …
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Effects of Cereal Cyst Nematode Infection on Resistant and Susceptible Barley
… infection on water transport, susceptible and resistant barley cultivars were studied using exudation and suction methods to measure hydraulic conductivity (Lpr). Hydrostatic Lpr obtained using the suction method was assessed in the presence of xylem tension which was exerted at the shoot base …
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The Effect of Nematode Isolate and Soil Environment on the Tobacco cyst Nematode (Globodera tabacum solanacearum), a Pathogen of Flue-cured Tobacco and Other Solanaceous Crops
… to reproduce upon both a susceptible (K326) and resistant (NC567) cultivar, to compare TCN reproduction in non-infested soils with currently TCN-infested soils, and to examine reproduction and pathogenicity of TCN on other solanaceous crops. Tobacco cyst nematode reproduction on the TCN-resistant …
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Effect of herbicides on Cylindrocladium crotalariae and the cylindrocladium black rot (CBR) disease of peanut
… disease severity in ‘NC3033’ peanut, a CBR-resistant cultivar. Dinoseb at 1.68 kg/ha increased significantly (P=0.05) the severity of CBR in Woodstown soil, but did not in Ruston soil. Higher rates of dinoseb (3.36 and 6.72 kg/ha) were found to have no effect. Field tests were conducted in …
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Effect of different production practices on the development of verticillium wilt and cotton fiber quality
… of different planting dates, seeding rates, and cultivars on suppressing Verticillium wilt; 2) simulate the temporal dynamics of Verticillium wilt in cotton for different seeding rates and cultivars; 3) examine the relationship between wilt incidence, lint yield, and various fiber quality …
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[EMBARGOED] Analysis of cereal cyst nematode resistance mechanisms in barley
… annual losses of around $160 billion. The use of cultivars resistant to H. avenae is the preferred approach for nematode management and four resistance loci, Rha1, Rha2, Rha3 and Rha4, have been mapped. The Rha4 locus was mapped in the Galleon/Haruna Nijo population to chromosome 5H and since Rha2 …
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Evaluation of Rhizoctonia solani - Heterodera glycines interactions on soybean
… Seed treatments were applied to soybean cultivars that were resistant and susceptible to SCN. Field studies were conducted at two Illinois locations (Urbana and Carmi). In 2009, 2010, and 2011, at Urbana, IL and in 2011 at Carmi, IL, SCN HG type 2.5.7 occurred naturally, and natural R. …
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Cercospora sojina: over-winter survival and fungicide resistance
… trifloxystrobin in 2009. In 2010, QoI fungicide resistant isolates were found at two locations in Illinois, one location in Kentucky, and two locations in Tennessee. QoI fungicide sensitivity levels of the resistant isolates were over 200-fold higher than baseline isolates using petri dish …
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Control of fusarium head blight in wheat: I. Evaluation of host plant resistance and fungicides II. Molecular markers associated with QTL for resistance
… treatments can suppress FHB, the use of resistant cultivars is also an essential tool for control of FHB. Breeding for resistance to FHB has become a very large part of wheat and barley breeding programs in temperate climates. Various sources of resistance have been used to develop new …