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Thanda Wai, Jack Staub, and Rebecca Grumet

TMG-1 is resistant to ZYMV and WMV-2, two closely related potyviruses. Resistance to ZYMV is due to a single recessive gene (Provvidenti, 1987); however, two recessive genes appear to confer resistance to WMV-2. We sought to further characterize the resistances by studying possible linkage relationships with physiological, morphological, electromorphic, and phytopathological markers. TMG-1, WI-2757 (an inbred line susceptible to both viruses), and their F2 progeny were screened for various single gene characters that differ between the two parents. Linkages reported in the literature were also observed in this study: (1) between bitterfree (bi) and female (F), and (2) between numerous spine (ns), small spine (ss), and tuberculate (Tu). New linkages detected were between: (1) resistance to WMV-2 and F, (2) resistance to WMV-2 and ZYMV, and (3) possibly resistance to ZYMV with fusarium and ns.

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Richard G. Snyder, Frank Killebrew, and Joseph A. Fox

Yellow squash (Cucurbita pepo L.) planted after early spring in Mississippi have a strong likelihood of developing green streaks and blotches on the fruit-symptoms of watermelon mosaic virus strain 2. Cultivars with the relatively new precocious yellow gene (PYG) tend to show such symptoms less prominently, and in some cases not at all, when infected. Field trials were conducted at two locations to evaluate several PYG cultivars and compare their WMV-2 symptoms to those of standard, non-PYG types. In both cases, the PYG cultivars had fewer unmarketable fruit due to WMV-2 symptoms, although they were not entirely immune to the virus.

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Juan Pablo Arce-Ochoa, Frank Dainello, Leonard M. Pike, Hector Quemada, and David Drews

Two of Asgrow's experimental virus resistant transgenic lines, XPH-1719 and XPH-1739, and their parental line, Pavo, a commercially grown virus susceptible hybrid, were tested for field performance at the Texas A&M University Experimental Farm in the summer of 1993. The two transgenic squash lines possessed the desired fruit and plant characteristics of Pavo plus resistance to ZYMV and WMV2 (XPH-1719), and resistance to ZYMV, WMV2 and CMV (XPH-1739). Under the conditions of this test it was determined that the two transgenic hybrids, were equally effective in producing high quality marketable fruits/ha with 89.64 % and 86.84 % respectively and marketable yields with 13,762 kg/ha and 16,525 kg/ha respectively. XPH-1719 and XPH-1739 also demonstrated their outstanding virus resistance by producing only 3.44% and 14.35% symptomatic plants/ha, and 0.00% and 7.17% infected fruits/ha respectively compared to 53.55% symptomatic Pavo plants/ha, and 25.73% infected Pavo fruits/ha.

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Chandrasekar S. Kousik, Kai-Shu Ling, Scott Adkins, Craig G. Webster, and William W. Turechek

(ZYMV) ( Guner, 2004 ). PI 595203 was developed by pure line selection in Georgia from WM-4 with resistance to WMV2 strain FC-1656 (< >). It was also resistant to isolates of WMV2 originating

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

States are PRSV-W [formerly Watermelon mosaic virus -1 (WMV-1)], WMV [formerly Watermelon mosaic virus -2 (WMV-2)], and Zucchini yellow mosaic virus . All three viruses are nonpersistently transmitted by several species of aphids, and mixed infections

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Wilfredo Seda-Martínez, Linda Wessel-Beaver, Angela Linares-Ramírez, and Jose Carlos V. Rodrigues

maxima Duch.): Yield and quality effects of ZYMV and WMV 2 virus infections N. Z. J. Crop Hort. Sci. 28 17 26 doi: 10.1080/01140671.2000.9514118 Kumar, N.K.K. Kalleshwaraswamy, C.M. Ranganath, H.R. Kashinath, B.L. 2008 Role of Aphis gossypii Glover