L. M. Quesada-Ocampo
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View article: A Reference-Quality NLRome for the Hexaploid Sweetpotato and Diploid Wild Relatives
A Reference-Quality NLRome for the Hexaploid Sweetpotato and Diploid Wild Relatives Open
Breeding for sweetpotato ( Ipomea batatas) resistance requires accelerating our understanding of genomic sources of resistance. Nucleotide-binding domain leucine-rich repeat receptor (NLR) proteins represent a key component of the plant im…
View article: A reference-quality NLRome for the hexaploid sweetpotato and diploid wild relatives
A reference-quality NLRome for the hexaploid sweetpotato and diploid wild relatives Open
Breeding for sweetpotato ( Ipomea batatas ) resistance requires accelerating our understanding genomic of sources of resistance. Nucleotide-binding domain leucine-rich repeat receptors (NLRs) proteins represent a key component of the plant…
View article: Effector Repertoire of the Sweetpotato Black Rot Fungal Pathogen<i>Ceratocystis fimbriata</i>
Effector Repertoire of the Sweetpotato Black Rot Fungal Pathogen<i>Ceratocystis fimbriata</i> Open
In 2015, sweetpotato producers in the United States experienced one of the worst outbreaks of black rot recorded in history, with up to 60% losses reported in the field and packing houses and at shipping ports. Host resistance remains the …
View article: Recent Advances and Challenges in Management of Colletotrichum orbiculare, the Causal Agent of Watermelon Anthracnose
Recent Advances and Challenges in Management of Colletotrichum orbiculare, the Causal Agent of Watermelon Anthracnose Open
The fungus Colletotrichum orbiculare causes watermelon anthracnose and is an important pathogen of watermelon in the United States, causing a significant impact on yield and quality of the produce. The application of fungicides as preventa…
View article: <i>Phytophthora capsici</i>: Recent Progress on Fundamental Biology and Disease Management 100 Years After Its Description
<i>Phytophthora capsici</i>: Recent Progress on Fundamental Biology and Disease Management 100 Years After Its Description Open
Phytophthora capsici is a destructive oomycete pathogen of vegetable, ornamental, and tropical crops. First described by L.H. Leonian in 1922 as a pathogen of pepper in New Mexico, USA, P. capsici is now widespread in temperate and tropica…
View article: Comparative Transcriptome Analysis of Two Contrasting Maize Inbred Lines Provides Insights on Molecular Mechanisms of Stalk Rot Resistance
Comparative Transcriptome Analysis of Two Contrasting Maize Inbred Lines Provides Insights on Molecular Mechanisms of Stalk Rot Resistance Open
Maize stalk rot caused by Fusarium graminearum can lead to severe losses and accumulation of mycotoxins with detrimental effects on livestock health. Because few management strategies are available, the development of resistant varieties i…
View article: The hop downy mildew pathogen <i>Pseudoperonospora humuli</i>
The hop downy mildew pathogen <i>Pseudoperonospora humuli</i> Open
Pseudoperonospora humuli is an obligate biotrophic oomycete that causes downy mildew, one of the most devastating diseases of cultivated hop, Humulus lupulus . Downy mildew occurs in all production areas of the crop in the Northern Hemisph…
View article: Fantastic Downy Mildew Pathogens and How to Find Them: Advances in Detection and Diagnostics
Fantastic Downy Mildew Pathogens and How to Find Them: Advances in Detection and Diagnostics Open
Downy mildews affect important crops and cause severe losses in production worldwide. Accurate identification and monitoring of these plant pathogens, especially at early stages of the disease, is fundamental in achieving effective disease…
View article: Managing Stubborn Oomycete Plant Pathogens
Managing Stubborn Oomycete Plant Pathogens Open
Diseases caused by oomycete plant pathogens result in devastating losses to agriculture and native forests, despite the significant research efforts that have advanced our understanding of these organisms. Limiting these pathogens has been…
View article: Assessment of fungicide product applications and program approaches for control of downy mildew on pickling cucumber in North Carolina
Assessment of fungicide product applications and program approaches for control of downy mildew on pickling cucumber in North Carolina Open
Pseudoperonospora cubensis, the causal agent of cucurbit downy mildew (CDM), is the most economically devastating and widespread disease of cucurbitaceous crops in the Eastern United States (US). Cucumbers are particularly susceptible and …
View article: The Effector Repertoire of the Hop Downy Mildew Pathogen Pseudoperonospora humuli
The Effector Repertoire of the Hop Downy Mildew Pathogen Pseudoperonospora humuli Open
Pseudoperonospora humuli is an obligate biotrophic oomycete that causes downy mildew (DM), one of the most destructive diseases of cultivated hop that can lead to 100% crop loss in susceptible cultivars. We used the published genome of P. …
View article: Vine Removal Prior to Harvest, and Curing Duration and Temperature Affect the Incidence and Severity of Internal Necrosis in ‘Covington’ Sweetpotato
Vine Removal Prior to Harvest, and Curing Duration and Temperature Affect the Incidence and Severity of Internal Necrosis in ‘Covington’ Sweetpotato Open
Internal necrosis (IN) is a physiological disorder that affects Covington, the most commonly grown sweetpotato ( Ipomoea batatas ) cultivar in North Carolina. Because IN affects the quality of sweetpotato storage roots, studies have been c…
View article: Clade-Specific Biosurveillance of <i>Pseudoperonospora cubensis</i> Using Spore Traps for Precision Disease Management of Cucurbit Downy Mildew
Clade-Specific Biosurveillance of <i>Pseudoperonospora cubensis</i> Using Spore Traps for Precision Disease Management of Cucurbit Downy Mildew Open
Pseudoperonospora cubensis is an obligate oomycete and cause of cucurbit downy mildew (CDM), the most destructive foliar disease affecting cucurbit hosts. Annual epidemics develop throughout the United States as windborne sporangia travel …
View article: Population Analyses Reveal Two Host-Adapted Clades of <i>Pseudoperonospora cubensis</i>, the Causal Agent of Cucurbit Downy Mildew, on Commercial and Wild Cucurbits
Population Analyses Reveal Two Host-Adapted Clades of <i>Pseudoperonospora cubensis</i>, the Causal Agent of Cucurbit Downy Mildew, on Commercial and Wild Cucurbits Open
Pseudoperonospora cubensis, the causal agent of cucurbit downy mildew, is an airborne, obligate oomycete pathogen that re-emerged in 2004 and causes foliar disease and yield losses in all major cucurbit crops in the United States. Approxim…
View article: Assessing the Role of Temperature, Inoculum Density, and Wounding on Disease Progression of the Fungal Pathogen <i>Ceratocystis fimbriata</i> Causing Black Rot in Sweetpotato
Assessing the Role of Temperature, Inoculum Density, and Wounding on Disease Progression of the Fungal Pathogen <i>Ceratocystis fimbriata</i> Causing Black Rot in Sweetpotato Open
In 2014, Ceratocystis fimbriata, causal agent of black rot in sweetpotato, reemerged and inflicted large financial losses on growers in the United States. Black rot continues to damage sweetpotatoes and has become a priority to the industr…
View article: Genome Sequencing and Transcriptome Analysis of the Hop Downy Mildew Pathogen<i>Pseudoperonospora humuli</i>Reveal Species-Specific Genes for Molecular Detection
Genome Sequencing and Transcriptome Analysis of the Hop Downy Mildew Pathogen<i>Pseudoperonospora humuli</i>Reveal Species-Specific Genes for Molecular Detection Open
Pseudoperonospora humuli is an obligate oomycete pathogen of hop (Humulus lupulus) that causes downy mildew, an important disease in most production regions in the Northern Hemisphere. The pathogen can cause a systemic infection in hop, ov…
View article: Characterizing Sources of Resistance to Phytophthora Blight of Pepper Caused by <i>Phytophthora capsici</i> in North Carolina
Characterizing Sources of Resistance to Phytophthora Blight of Pepper Caused by <i>Phytophthora capsici</i> in North Carolina Open
Phytophthora blight, caused by Phytophthora capsici, is an important disease of peppers in the United States and worldwide. P. capsici causes crown, root, and fruit rot as well as foliar lesions in peppers. Field trials were conducted in 2…
View article: Black Rot of Sweetpotato: A Comprehensive Diagnostic Guide
Black Rot of Sweetpotato: A Comprehensive Diagnostic Guide Open
Black rot of sweetpotato (Ipomoea batatas) has been considered one of the most historically devastating diseases of the crop. The pathogen, Ceratocystis fimbriata (Ellis and Halst), is able to infect a variety of hosts including morning gl…
View article: Population Structure of <i>Pythium ultimum</i> from Greenhouse Floral Crops in Michigan
Population Structure of <i>Pythium ultimum</i> from Greenhouse Floral Crops in Michigan Open
Pythium ultimum causes seedling damping-off and root and crown rot in greenhouse ornamental plants. To understand the population dynamics and assess population structure of P. ultimum in Michigan floriculture crops, simple sequence repeats…
View article: Inoculation Method, Temperature, and Relative Humidity Affect Leaf and Neck Anthracnose, a New Onion Disease in Michigan
Inoculation Method, Temperature, and Relative Humidity Affect Leaf and Neck Anthracnose, a New Onion Disease in Michigan Open
Leaf and neck anthracnose caused by Colletotrichum coccodes is a new disease of onion in Michigan. To test the effect of inoculation method, Prince onion seedlings were grown in the greenhouse and inoculated with either a conidial suspensi…
View article: Advances in Diagnostics of Downy Mildews: Lessons Learned from Other Oomycetes and Future Challenges
Advances in Diagnostics of Downy Mildews: Lessons Learned from Other Oomycetes and Future Challenges Open
Downy mildews are plant pathogens that damage crop quality and yield worldwide. Among the most severe and notorious crop epidemics of downy mildew occurred on grapes in the mid-1880s, which almost destroyed the wine industry in France. Sin…
View article: Resurgence of cucurbit downy mildew in the United States: Insights from comparative genomic analysis of <i>Pseudoperonospora cubensis</i>
Resurgence of cucurbit downy mildew in the United States: Insights from comparative genomic analysis of <i>Pseudoperonospora cubensis</i> Open
Pseudoperonospora cubensis , the causal agent of cucurbit downy mildew ( CDM ), is known to exhibit host specialization. The virulence of different isolates of the pathogen can be classified into pathotypes based on their compatibility wit…
View article: Analysis of microsatellites from the transcriptome of downy mildew pathogens and their application for characterization of<i>Pseudoperonospora</i>populations
Analysis of microsatellites from the transcriptome of downy mildew pathogens and their application for characterization of<i>Pseudoperonospora</i>populations Open
Downy mildew pathogens affect several economically important crops worldwide but, due to their obligate nature, few genetic resources are available for genomic and population analyses. Draft genomes for emergent downy mildew pathogens such…
View article: Genetic Diversity, Fungicide Sensitivity, and Host Resistance to <i>Ceratocystis fimbriata</i> Infecting Sweetpotato in North Carolina
Genetic Diversity, Fungicide Sensitivity, and Host Resistance to <i>Ceratocystis fimbriata</i> Infecting Sweetpotato in North Carolina Open
Black rot of sweetpotato, caused by Ceratocystis fimbriata, has recently reemerged as a significant threat to sweetpotato production in North Carolina and other states across the United States. This disease has historically been controlled…
View article: Fungicide Rotation Programs for Managing Phytophthora Fruit Rot of Watermelon in Southeastern United States
Fungicide Rotation Programs for Managing Phytophthora Fruit Rot of Watermelon in Southeastern United States Open
About 50% of the watermelons in the United States are produced in the southeastern states, where optimal conditions for development of Phytophthora fruit rot prevail. Phytophthora fruit rot significantly limits watermelon production by cau…
View article: Using Next-Generation Sequencing to Develop Molecular Diagnostics for <i>Pseudoperonospora cubensis</i>, the Cucurbit Downy Mildew Pathogen
Using Next-Generation Sequencing to Develop Molecular Diagnostics for <i>Pseudoperonospora cubensis</i>, the Cucurbit Downy Mildew Pathogen Open
Advances in next-generation sequencing (NGS) allow for rapid development of genomics resources needed to generate molecular diagnostics assays for infectious agents. NGS approaches are particularly helpful for organisms that cannot be cult…
View article: Susceptibility of Maize to Stalk Rot Caused by <i>Fusarium graminearum</i> Deoxynivalenol and Zearalenone Mutants
Susceptibility of Maize to Stalk Rot Caused by <i>Fusarium graminearum</i> Deoxynivalenol and Zearalenone Mutants Open
Fusarium graminearum is a destructive pathogen of cereals that can cause stalk rot in maize. Stalk rot results in yield losses due to impaired grain filling, premature senescence, and lodging, which limits production and harvesting of ears…
View article: Cultural, Chemical, and Alternative Control Strategies for Rhizopus Soft Rot of Sweetpotato
Cultural, Chemical, and Alternative Control Strategies for Rhizopus Soft Rot of Sweetpotato Open
Rhizopus soft rot, caused primarily by Rhizopus stolonifer, is one of the most common postharvest diseases of sweetpotato and is often considered the most devastating. Traditionally, Rhizopus soft rot has been effectively controlled using …
View article: Etiology and Epidemiological Conditions Promoting Fusarium Root Rot in Sweetpotato
Etiology and Epidemiological Conditions Promoting Fusarium Root Rot in Sweetpotato Open
Sweetpotato production in the United States is limited by several postharvest diseases, and one of the most common is Fusarium root rot. Although Fusarium solani is believed to be the primary causal agent of disease, numerous other Fusariu…