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Gummy stem blight of watermelon12/16/2023 ![]() ![]() Anthony Keinath of Clemson University reported observing isolates of the gummy stem blight fungus that are resistant to fungicides with active ingredients in FRAC group 3 in South Carolina. **FRAC code indicates the mode of action of the fungicide. *Re-Entry period in hours/Pre-Harvest period in days ![]() 2019 103(5):984–989.Systemic fungicide for control of gummy stem blight, seen above, should be alternated between FRAC Codes. QTL mapping identifies novel source of resistance to Fusarium wilt race 1 in Citrullus amarus. QTL mapping of resistance to bacterial fruit blotch in Citrullus amarus. Screening for resistance to anthracnose (race 2), gummy stem blight, and root knot nematode in watermelon germplasm. Genetic characterization of Didymella bryoniae isolates infecting watermelon and other cucurbits in Florida and Georgia. 2010 65:1–60.īabu B, Kefialew YW, Li P-F, Yang X-P, George S, Newberry E, Dufault N, Abate D, Ayalew A, Marois J. Highlights of the Didymellaceae: a polyphasic approach to characterise Phoma and related Pleosporalean genera. Our findings will facilitate the use of molecular markers for efficient introgression of the resistance loci and development of GSB-resistant watermelon cultivars.Īveskamp M, De Gruyter J, Woudenberg J, Verkley G, Crous PW. High throughput markers were developed for selection of ClGSB5.1 and ClGSB7.1. Among them is ClCG07G013230, encoding an Avr9/Cf-9 rapidly elicited disease resistance protein, which contains a non-synonymous point mutation in the DUF761 domain that was significantly associated with GSB resistance. ![]() Locus ClGSB7.1 accounted for the highest phenotypic variation and harbors twenty-two candidate genes associated with disease resistance. The genes underlying ClGSB5.1 includes an NBS-LRR gene (ClCG05G019540) previously identified as a candidate gene for GSB resistance in watermelon. We identified three QTLs (ClGSB3.1, ClGSB5.1 and ClGSB7.1) associated with GSB resistance, explaining between 6.4 and 21.1% of the phenotypic variation. The population was phenotyped by inoculating seedlings with Stagonosporopsis citrulli 12178A in the greenhouse in two separate experiments, each with three replications. The objective of this study was to identify quantitative trait loci (QTLs) associated with GSB resistance in an F 2:3 interspecific Citrullus mapping population (N = 178), derived from a cross between Crimson Sweet (C. Utilizing GSB-resistant cultivars would reduce yield losses, decrease the high cost of disease control, and diminish hazards resulting from frequent fungicide application. Currently, no commercial cultivars with genetic resistance to GSB in the field have been reported. Gummy stem blight (GSB), caused by three Stagonosporopsis spp., is a devastating fungal disease of watermelon (Citrullus lanatus) and other cucurbits that can lead to severe yield losses. We identified QTLs associated with gummy stem blight resistance in an interspecific F 2:3 Citrullus population and developed marker assays for selection of the loci in watermelon. ![]()
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