Distribution of Baseline Sensitivities to Azoxystrobin Among Isolates of Plasmopara viticola.
Differences in the intrinsic activities of the three strobilurin fungicides against this pathogen are indicated and can be utilized in future monitoring of P. viticola resistance to azoxystrobin.
Phylogenetic Relationships of Xylella fastidiosa Strains Isolated from Landscape Ornamentals in Southern California.
- R. Hernández-MartÃnez, K. A. de la Cerda, H. Costa, D. Cooksey, F. Wong
- Biology, MedicinePhytopathology
- 18 June 2007
Xylella fastidiosa is an insect-borne, xylem-limited pathogenic bacterium that has been associated with a rise in incidence of diseased landscape ornamentals in southern California and was genetically characterized to understand their distribution and identity.
Sensitivity to Azoxystrobin Among Isolates of Uncinula necator: Baseline Distribution and Relationship to Myclobutanil Sensitivity.
The results of this study provide evidence of partial cross-sensitivity between azoxy Strobin and myclobutanil, and illustrate the potential selection for individuals with reduced sensitivity to azoxystrobin by postinfection application and reduced rates of this fungicide.
Occurrence and Distribution of QoI-Resistant Isolates of Colletotrichum cereale from Annual Bluegrass in California.
- F. Wong, S. Midland, K. A. de la Cerda
- Biology, MedicinePlant Disease
- 8 November 2007
Results indicate that QoI resistance is present in California populations of C. cereale and is contributing to the difficulty in controlling this disease.
Comparative Physical Modes of Action of Azoxystrobin, Mancozeb, and Metalaxyl Against Plasmopara viticola (Grapevine Downy Mildew).
The results of this study illustrate the unique physical modes of action for azoxystrobin in comparison to that of two traditional protectant and systemic fungicides, and provide information on how azoxy Strobin and other strobilurin fungicides with similar physical mode of action should be best used in disease management programs.
Sensitivity Distributions of California Populations of Colletotrichum cereale to the DMI Fungicides Propiconazole, Myclobutanil, Tebuconazole, and Triadimefon.
- F. Wong, S. Midland
- Biology, MedicinePlant Disease
- 8 November 2007
Information is provided on the development of DMI resistance in populations of C. cereale in California and methodologies for future resistance monitoring for this pathogen and single discriminatory dose testing in vitro with propiconazole could differentiate sensitive and resistant isolates.
Discovery and Characterization of Waitea circinata var. circinata Affecting Annual Bluegrass from the Western United States.
- K. A. de la Cerda, G. Douhan, F. Wong
- Biology, MedicinePlant Disease
- 18 June 2007
This study is the first morphological and molecular confirmation of the presence of W.circinata var.
DOCUMENTATION AND CHARACTERIZATION OF XYLELLA FASTIDIOSA STRAINS IN LANDSCAPE HOSTS Project Leaders:
To better understand the impact of Xylella fastidiosa on the urban environment and the potential for ornamental hosts to serve as reservoirs for agronomically important diseases caused by the…
First Report of Pyricularia grisea Causing Gray Leaf Spot on Kikuyugrass (Pennisetum clandestinum) in the United States.
- F. Wong, W. Gelernter, L. Stowell
- Biology, MedicinePlant Disease
- 1 April 2005
To the authors' knowledge, this is the first report of gray leaf spot being caused by P. grisea on Pennisetum clandestinum in North America.
Geographic Distribution and rDNA-ITS Region Sequence Diversity of Waitea circinata var. circinata Isolated from Annual Bluegrass in the United States.
- Chi-min Chen, K. A. de la Cerda, J. Kaminski, G. Douhan, F. Wong
- Biology, MedicinePlant Disease
- 6 August 2009
Results of this work indicate that W. circinata var.circinata is present in multiple states and provide an initial understanding of the diversity of the pathogen in the United States.
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