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Nihat Guner, Zvezdana Pesic-VanEsbroeck, Luis A. Rivera-Burgos, and Todd C. Wehner

). Sources of resistance to PRSV-W have been reported in watermelon. Strange et al. (2002) screened the USDA watermelon germplasm collection and reported PRSV-W resistance in three PI accessions from South Africa (PI 244017, PI 244018, and PI 244019), three

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Nihat Guner, Zvezdana Pesic-VanEsbroeck, Luis A. Rivera-Burgos, and Todd C. Wehner

( Coutts et al., 2011 ; Fuchs and Gonsalves 1995 ; Namba et al., 1992 ). The watermelon germplasm collection has been screened for resistance to viral diseases on several occasions. Resistant PI accessions were identified for ZYMV ( Boyhan et al., 1992

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Maria M. Jenderek and Yayeh Zewdie

Until recently, there has been no large-scale production of true seeds in garlic (A. sativum L. and A. longicuspis L.). The recent discovery of male fertile garlic accessions stimulated research on the genetics and breeding of garlic. However, there is no information regarding the phenotypic characteristics of garlic populations generated from true seeds. We evaluated the first generation of sexually derived families of garlic for bulb and clove weight, number of cloves per bulb, flower stalk height, number of leaves, plant height, and days required to achieve bulb maturity. Significant variations were observed within and among families for these important traits.

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Gabriele Gusmini, Luis A. Rivera-Burgos, and Todd C. Wehner

( Gusmini et al., 2002 ). Available PI accessions (totaling 1274) from the USDA-ARS watermelon germplasm collection, along with 51 adapted cultivars, were tested to identify new genetic sources of resistance to GSB ( Gusmini et al., 2005 ). A total of 59 new

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Jesse Wimer, Debra Inglis, and Carol Miles

none of the tested rootstocks were resistant. Of the many commercial watermelon rootstocks on the market, none have been sufficiently tested for verticillium wilt resistance or tolerance in Washington. The USDA NPGS contains over 1000 PI accessions in

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Katharina S. Wigg and Irwin L. Goldman

categories of 97 Beta vulgaris subsp. vulgaris PI accessions in response to inoculation with Rhizoctonia solani AG 2-2 isolate R1 in a greenhouse screen evaluated in 2018. Table 2. Mean diseased tissue percentage, most likely internal disease ratings

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Kyle M. VandenLangenberg and Todd C. Wehner

cucumber cultivars and PI accessions (hereafter collectively referred to as cultigens) differing in disease resistance were used to evaluate severity of disease at different life-cycle stages. Cultigens were chosen based on previous studies at North

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Howard F. Harrison Jr., Chandrasekar S. Kousik, and Amnon Levi

System, 2008 ) and ranked using Wilcoxon rank scores. Seeds of PI accessions with high clomazone tolerance or susceptibility were produced from greenhouse-grown, self-pollinated plants for use for subsequent experiments. A greenhouse experiment was

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D. Michael Jackson, Howard F. Harrison, Robert L. Jarret, and Phillip A. Wadl

‘Tainung 57’ (PI 531147 and PI 573295), ‘Wagabolige’ (PI 595888 and PI 633966), IITA-TIS 9101 (PI 599385 and PI 606278), and ‘Helena’ (PI 606268 and PI 612696), with each of the first listed PI accessions used in this study. The leaves of two accessions

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Christopher S. Cramer, Narinder Singh, Neel Kamal, and Hanu R. Pappu

this research was to evaluate onion PI accessions in the current collection for foliage color, visible amount of epicuticular leaf wax, number of thrips per plant, and IYS disease severity and incidence and to select individual plants with reduced