was identified as a tar spot fungus on sp. in 1902, and has since been recorded on several species of in China, Japan, and Korea. Most of the previous records of have been based on a list of disease occurrences in the absence of any formal morphological identification or molecular analyses. Using six newly obtained specimens collected in the past 2 years, we confirmed the tar spot fungus found on in Korea as based on morphological examinations and molecular phylogenetic analyses. This fungus was distinguished from , another tar spot fungus on , by ascospore size and geographical distributions. We present detailed mycological information and, for the first time, DNA sequence data useful for the identification of .
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http://dx.doi.org/10.1080/12298093.2022.2054527 | DOI Listing |
Plant Dis
December 2024
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A.
Visual detection of stromata (brown-black, elevated fungal fruiting bodies) is the primary method for quantifying tar spot early in the season because these structures are definitive signs of the disease and essential for effective disease monitoring and management. Here, we present the Stromata Contour Detection Algorithm version 2 (SCDA v2), which addresses the limitations of the previously developed SCDA version 1 (SCDA v1), without the need to empirically search for optimal decision-making input parameters (DMIPs) while achieving higher and consistent accuracy in tar spot stromata detection. SCDA v2 operates in two components: (i) SCDA v1 producing tar spot-like region proposals for a given input corn leaf Red-Green-Blue (RGB) image and (ii) a pretrained convolutional neural network (CNN) classifier identifying true tar spot stromata from the region proposals.
View Article and Find Full Text PDFPlant Dis
September 2024
University of Minnesota, Department of Plant Pathology, St. Paul, MN 55108.
Tar spot of corn ( L.) is a significant disease in the United States and Canada caused by , an obligate biotroph fungus. However, field research critical for understanding and managing the disease has been hindered by a need for methods to inoculate corn with in field environments.
View Article and Find Full Text PDFPhytopathology
August 2024
Crop Production and Pest Control Research Unit, U.S. Department of Agriculture-Agricultural Research Service, West Lafayette, IN 47907.
MycoKeys
December 2023
School of Life Sciences and Technology, Lingnan Normal University, Zhanjiang 524048, China Lingnan Normal University Zhanjiang China.
Vetiver grass () has received extensive attention in recent years due to its diverse applications in soil and water conservation, heavy metal remediation, as well as essential oil and phenolic acids extraction. In 2019, the emergence of tar spot disease on was documented in Zhanjiang, Guangdong Province, China. Initially, the disease manifested as black ascomata embedded within leaf tissue, either scattered or clustered on leaf surfaces.
View Article and Find Full Text PDFMar Pollut Bull
January 2024
Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 310800, Israel.
The Levantine basin (LB) in the Southeastern Mediterranean Sea is a high-risk oil pollution hot spot owing to its dense maritime traffic and intense oil and gas exploration and exploitation activities. In February 2021 the Israeli LB shorelines were impacted by an exceptional tar pollution event (~550 tons; average distribution: ~3 kg tar m front beach) of an unknown oil spill source. Here we report on the immediate numerical modelling assessment of the oil spill propagation and tar distribution; operational use of underwater gliders for tracking water column anomalies of dissolved polycyclic aromatic hydrocarbons (PAHs) and turbidity signals; the beached tar composition and amounts and the short-term response of the microbial population along the ~180 km shoreline.
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