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 28 for “"Fungicide Resistance"”.
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Cercospora sojina: over-winter survival and fungicide resistance
… monitoring of Quinone outside inhibitor (QoI) fungicide resistance in C. sojina. QoI fungicides have been effective in managing frogeye leaf spot, but the risk of selecting C. sojina strains with resistance to this class of fungicides is considered high. A QoI fungicide resistance monitoring …
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Characterization of Fungicide Resistance in Venturia inaequalis Populations in Virginia
… of apples that is predominantly controlled with fungicides. Of the chemical classes currently available, the sterol-inhibiting (SI) and strobilurin (QoI) fungicides are the most commonly used. Recent observations indicate that V. inaequalis populations in Virginia have developed resistance to …
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Using epidemiological principles and mathematical models to understand fungicide resistance evolution
The use of agricultural fungicides exerts very strong selection pressures on plant pathogens. This can lead to the spread of fungicide resistance in the pathogen population, which leads to a reduction in efficacy of disease control and loss of yield. In this thesis, we use mathematical modelling to …
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Strawberry Powdery Mildew Caused by Podosphaera aphanis: Fungicide Resistance and Host Plant Resistance
… One objective of this study was to evaluate the resistance developed in populations of strawberry powdery mildew to chemical control measures. A fungicide assay was developed to evaluate the efficacy of six treatments (penthiopyrad, quinoxyfen, myclobutanil, trifloxystrobin, cyflufenamid, …
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Fungicide Resistance of Botrytis Cinerea from Virginia Wine grapes, Strawberry, and Ornamentals Crops
… fruits and ornamental crops. It has developed resistance to many fungicides, and isolates from eastern US strawberry fields have regularly been identified with resistance to several modes of action. During the 2011-2015 growing seasons, 487 isolates were collected from Virginia wine grapes, …
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Genotypic characterization and fungicide resistance monitoring for Virginia populations of Parastagonospora nodorum in wheat
… practices, resistant varieties, and foliar fungicides. There are increasing trends of severity and incidence of SNB in Virginia and the surrounding mid-Atlantic region, but it is not known if changes in the pathogen population are contributing to this trend. The overall goal of this research …
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INTEGRATING FUNGICIDE RESISTANCE MONITORING AND FORECASTING MODELS FOR THE PRECISION MANAGEMENT OF GRAPEVINE DOWNY MILDEW
… still relies heavily on repeated applications of fungicides, which remain the most effective and widely adopted means of control. However, this high level of chemical input is associated with increasing concerns regarding environmental and human health impacts and has led to the progressive …
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Optimising fungicide application tactics: using mathematical modelling to understand qualitative and quantitative fungicide resistance management
… fungal pathogens include chemical control with fungicides and use of disease-resistant cultivars. Both strategies are threatened by pathogen evolution leading to fungicide resistance and loss of cultivar efficacy (‘cultivar breakdown’). Both fungicide resistance and cultivar breakdown can be …
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Evaluating Fungicide Timing for Leaf Spot Diseases of Wheat and Fungicide Resistance in Pyrenophora tritici-repentis
… tritici-repentis. The optimal timing to apply fungicide to protect wheat against leaf spots is during the flag leaf stage (ZGS39), however, another disease, fusarium head blight (FHB), is also a major issue in wheat grown in the prairies and is capable of devastating an entire crop. The optimal …
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Alternaria Leaf Blight and Head Rot of Broccoli: UAV-Based Disease Detection and Fungicide Resistance Management
… relies on quinone outside inhibitor (QoI) fungicides, but recent reports indicate reduced efficacy. The causes for this decline are unclear, whether due to a novel species or resistance within existing species. Additionally, knowledge gaps exist regarding disease-tolerant broccoli …
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Evaluation of fungicide resistance in Sclerotinia minor and strategies for chemical control of sclerotinia blight of peanut
Testing several registered and experimental fungicides in the laboratory and field has resulted in the identification of two compounds possessing high levels of fungitoxicity to Sclerotinia minor, the causal agent of Sclerotinia blight of peanut. The two fungicides, ASC-66825 and RH-3486, are …
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Characterization of fungicide resistance in grape powdery and downy mildew using field trials, bioassays, genomic, and transcriptomic approaches: quinoxyfen, phosphite, and mandipropamid
Development of fungicide resistance in fungal and oomycete pathogens is a serious problem in grape production. Quinoxyfen is a fungicide widely used against grape powdery mildew (Erysiphe necator). In 2013, E. necator isolates with reduced quinoxyfen sensitivity (designated as quinoxyfen lab …
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Quantification of Fungicide Resistance in Cercospora sojina Populations and Development of a Fungicide Application Decision Aid for Soybean in the Mid-Atlantic U.S.
… blight. In addition to crop rotation and host resistance, foliar fungicides, often with quinone outside inhibitor (QoI) active ingredients, are used to manage these soybean foliar diseases. Yield benefits of foliar fungicides have been inconsistent and this may be the result of low disease …
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EPIDEMIOLOGY AND POPULATION GENETICS OF THE GRAPE POWDERY MILDEW CAUSAL FUNGUS, ERYSIPHE NECATOR, AND ITS RELATION TO COMMERCIAL DISEASE MANAGEMENT
… have been shown numerous times to overcome host resistance and several fungicide groups within a couple years of deployment. For this study, Amplicon Sequencing (AmpSeq) was performed on 3,170 field samples of E. necator collected between 2015 and 2020 with multiple timepoints per season …
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Effect of Protective Covers Against Biotic and Abiotic Disorders for Grape Production in Virginia
… Thus, growers routinely use insecticides and fungicides to protect their fruits. However, frequent or excessive use of these chemicals can pose environmental and human health risks and increase the chances of fungicide resistance. Many crop production systems use physical barriers to shield …
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IDENTIFICATIN AND CHARACTERIZATION OF PATHOGENICITY GENES IN FUSARIUM VIRGULIFORME, THE CAUSAL AGENET OF SUDDEN DEATH SYNDROME (SDS) IN SOYBEAN
… as the ones involved in phytotoxin production, fungicide resistance and aggressiveness.
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Developing Novel Management Options for Pear Fire Blight and Apple Bitter Rot with Characterization of Apple European Canker in Virginia
… apples caused by Colletotrichum spp., eighteen fungicide treatments were evaluated over two years, focusing on newer fungicide options to mitigate fungicide resistance development. Fungicides such as Omega, Aprovia, Ferbam, Captan, Ziram, and Cabrio were proven reliable management tools, …
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Effects of chitosan oligosaccharide-amended fungicide treatments on the control of fusarium head blight in wheat
… Current management strategies rely heavily on fungicide applications; however, their effectiveness varies among active ingredients, and overuse may lead to fungicide resistance and environmental concerns. Chitosan oligosaccharide (COS) is a product derived from chitin deacetylation that has …
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Identification of fungal species causing powdery mildew on cucurbits, determination of the genetic and pathogenic variations of the fungi and their sensitivity to major powdery mildew fungicides
… and pathogenic variation of the pathogen, or the fungicide-resistance of the fungus in the North Central Region (NCR). This research was conducted to: 1) identify species causing powdery mildew on cucurbits in Illinois and some other major cucurbit producing areas in the United States; 2) …
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Characterizing resistance of Erysiphe necator to fungicides belonging to the quinone outside inhibitors and demethylation inhibitors
Practical resistance of Erysiphe necator to quinone outside inhibitors (QoIs) is now widespread, and resistance to demethylation inhibitors (DMIs) has also developed. The goal of this research was to characterize fungicide resistance by elucidating resistance mechanisms and determining its …
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