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when the insect population is high ( Nakhla and Maxwell, 1998 ). As of 2020, four whitefly-transmitted viruses have been detected in Cucurbits in Georgia and Florida: CuLCrV, CYSDV, Squash vein yellowing virus (SqVYV), and Cucurbit chlorotic yellows

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Forty-four accessions of Cucumis melo L. and related wild species were tested for reaction to a yellowing disease, incited by the recently identified cucurbit yellowing stunting disorder virus (CYSDV), under natural and controlled-inoculation conditions. The C. melo TGR-1551 accession and one Cucumis metuliferus Naud. accession were asymptomatic. The segregation ratios obtained following controlled inoculations of the family produced by crossing TGR-1551 with the susceptible Spanish cv. Piel de Sapo revealed that the resistance to CYSDV in TGR-1551 is conditioned by a dominant allele at one locus. The name Cucurbit yellow stunting and symbol Cys is proposed for this locus.

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) and CYSDV (family Closteroviridae , genus Crinivirus ) since 2006 ( Gonzalez et al., 1992 ; Kuo et al., 2007 ). CYSDV infection produces yellowing and interveinal leaf chlorosis. Symptoms generally occur first in older (basal) leaves and spread

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yellow stunting disorder virus (CYSDV; family Closteroviridae , genus Crinivirus ) was first recognized on melon in the 1980s in the United Arab Emirates ( Hassan and Duffus, 1990 ) and is a threat to melon production worldwide. It has been reported in

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mildew incited by Podosphaera xanthii (Castagne) U. Braun & N. Shishkoff ( Shishkoff, 2000 ) and the yellowing incited by Cucurbit yellow stunting disorder virus (CYSDV) and the incidence of the cotton-melon aphid, Aphis gossypii are three of the

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Pseudoperonospora cubensis (S.O. Park and K.M. Crosby, unpublished data), and cucurbit yellow stunting disorder virus (CYSDV) ( Lopez-Sese and Gomez-Guillamon, 2000 ). Table 1. Comparison of major characteristics between the melon parents ‘Deltex’ and TGR

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yellowing stunting disorder virus (CYSDV) in Cucumis melo L HortScience 35 110 113 McCreight, J.D. 2000 Inheritance of resistance to lettuce infectious yellows virus in melon HortScience 35 1118 1120

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highest resistance to PRSV-W, but it had intermediate resistance to ZYMV in our study. Finally, PI 386015 and PI 386016 were reported to be resistant to cucurbit yellow stunting disorder virus (CYSDV) by Lecoq et al. (1998) , and they were resistant to

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resources of the genus Cucumis and their morphological description HortScience 30 14 42 Lopez-Sese, A.I. Gomez-Guillamon, M.L. 2000 Resistance to Cucurbit yellowing stunting disorder virus (CYSDV) in Cucumis melo L HortScience 35 110 113 McCarthy, W

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