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233 tomato accessions of the Central American tomato collection maintained at CATIE and 7 commercial cultivars were evaluated for resistance to 4 virulent strains of Pseudomonas solanacearum representing race 1 biovars 1 and 3. In general biovar 3 strains wilted seedlings faster than biovar 1 strains but by 20 days post inoculation no significant differences were noted in susceptible check ratings. Highly significant differences for disease index were noted but no line with complete resistance was found. Two CATIE accessions, 17334 and 17340, were found to be as resistant as Hawaii 7998 to all 4 strains. Accessions 17345 and MIP-CH1 were resistant to 3 strains.

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characteristic V-shaped lesions originating from the leaf margin, which enlarge causing the plant to wilt and eventually rot. Currently, the most effective approaches to controlling black rot are through good agricultural practices, hot water treatment of seeds

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Abbreviations: F, fast band; FF, fast-migrating band; FS, fast- and slow-migrating bands; PER, peroxidase; PGM, phosphoglucomutase; PI, plant introduction; S, slow band; SOD, superoxide dismutase; SS, slow-migrating band. 1 To whom reprint requests

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grant from the North Carolina Pickle Producers Association. We gratefully acknowledge the technical assistance of Christopher S. Cramer, Tammy L. Ellington, and Joel L. Shuman. We also thank the USDA North Central Regional Plant Introduction Station at

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Plant introductions (PIs) into the United States have come from thousands of sources: immigrants, tourists, government officials. The first official PI activities by the United States government were conducted in the late 1700s and early 1800s

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Regional Plant Introduction Station, Ames, Iowa for assistance with obtaining seed; D. Viands and W. Sun for assistance with data analyses; and L. Hsu, J. Drennan, S. Fenton, J. Jantz, and G. Moriarty for technical assistance. The cost of publishing this

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conservation of horticultural crops. The first speaker, Barbara Hellier, USDA-ARS-Western Regional Plant Introduction Station, Pullman, WA, focused on the process of organizing and participating in USDA-ARS Plant Exploration Office-sponsored plant expeditions

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Production of transgenic tall fescue. A total of 17 regenerated plants were obtained from five hygromycin-resistant calli through Agrobacterium -mediated transformation. Introduction of OsALS (dm) and hpt genes was confirmed by PCR analysis. The PCR

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Horticulture IPM Working Group developed an online learning module entitled, “Introduction to Diagnostics for Master Gardener Volunteers: Approaches to Plant Pest Diagnosis.” The goal of the module was to increase EMG confidence and knowledge in the diagnostic

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An invasive species is defined as “an alien (non-native) species whose introduction does or is likely to cause economic or environmental harm or harm to human health” ( USDA, 2018a ). Invasive plants have been subject to significant research from

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