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Showing 1 to 20 of 209 for “"fungicide"”.
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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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Use of the systemic fungicide propiconazole for oak wilt management: an assessment of uncharacterized host - pathogen - fungicide interactions.
Propiconazole is a systemic fungicide widely used for the control of oak wilt, however, the long-term efficacy of this fungicide has not been well established and treatment effectiveness may be below levels that justify its use in many situations. To date, it is not known if propiconazole …
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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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Phytophthora nicotianae: Fungicide Sensitivity, Fitness, and Molecular Markers
… resistance to this compound and to investigate fungicide resistance management strategies. Phytophthora nicotianae, a destructive pathogen of numerous herbaceous and some woody ornamental plants, was used as a model system. P. cinnamomi, a major pathogen of a wide range of tree species and shrub …
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Evaluation of race population distribution, fungicide sensitivity, and fungicide control of Exserohilum turcicum, the causal agent of northern leaf blight of corn
… NLB control. Demethylation inhibitor (DMI) fungicides have been labeled for corn use since the early 1990s; in this dissertation a study was conducted to measure E. turcicum baseline sensitivity to DMI fungicides and monitor shifts in sensitivity over years. Metconazole, propiconazole, and …
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Determination of the water solubility of the fungicide chlorothalonil
A UV-Visible spectrophotometric analytical procedure was developed and used to measure the water solubility of chlorothalonil at temperatures ranging from 8.5 to 37.5 °C. The effect of formulation chemicals present in BRAVO®500, a pesticide formulation containing chlorothalonil, on the apparent …
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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.
… 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 pressure, unfavorable …
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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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Does agronomic management affect an at-planting fungicide application on corn?
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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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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Understanding variability associated with corn grain yield response to foliar fungicide application
Quinone outside inhibitor (QoI) fungicide (e.g., pyraclostrobin, azoxystrobin, and trifloxystrobin) fungicide application is becoming a common practice in corn production systems. The strobilurin class of fungicides inhibits mitochondrial respiration in fungal cells, and preventing plant pathogen …
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Fungicide and fertilizer-mediated changes in prairie plant-foliar fungal endophyte interactions
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Fungicide Sensitivity of Erysiphe necator and Plasmopara viticola from Virginia and nearby states
… Erysiphe necator) to commonly used single-site fungicides in Virginia and nearby states. DM and PM isolates were collected from 2005 to 2007. In grape leaf disc bioassays, 92% of the DM isolates were QoI (azoxystrobin)-resistant, but none were resistant to mefenoxam. Eighty-two percent of the PM …
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Strawberry Powdery Mildew Caused by Podosphaera aphanis: Fungicide Resistance and Host Plant Resistance
… powdery mildew to chemical control measures. A fungicide assay was developed to evaluate the efficacy of six treatments (penthiopyrad, quinoxyfen, myclobutanil, trifloxystrobin, cyflufenamid, fluopyram + trifloxystrobin) for control of the disease. Nineteen isolates of strawberry powdery mildew …
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Genetic diversity and fungicide sensitivity of Rhizoctonia solani associated with soybean seedling disease
… to members of this species, seed treatment fungicides have become increasingly important as a management option. However, our knowledge of the groups associated with soybean seedlings, the genetic structure of the pathogenic groups, as well as their potential for adaptation to fungicide seed …
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Fungicide Resistance of Botrytis Cinerea from Virginia Wine grapes, Strawberry, and Ornamentals Crops
… 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, strawberries, and …
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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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