| Autor: |
Ghimire B; Department of Plant Pathology, University of Georgia, Griffin Campus, Griffin, GA 30223, USA.; Institute of Plant Breeding, Genetics and Genomics, University of Georgia, Griffin Campus, Griffin, GA 30223, USA., Orellana R; Georgia Center for Urban Agriculture, Extension Northwest District, University of Georgia, Griffin Campus, Griffin, GA 30223, USA., Chowdhury SR; QAAFI, The University of Queensland, Brisbane, QLD 4072, Australia., Vermeer CB; Department of Plant Pathology, University of Georgia, Griffin Campus, Griffin, GA 30223, USA., Patel P; Department of Soil & Crop Sciences, Texas A&M University, College Station, TX 77843, USA., Raymer P; Institute of Plant Breeding, Genetics and Genomics, University of Georgia, Griffin Campus, Griffin, GA 30223, USA.; Department of Crop and Soil Sciences, University of Georgia, Griffin Campus, Griffin, GA 30223, USA., Milla-Lewis S; Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC 27695, USA., Buck JW; Department of Plant Pathology, University of Georgia, Griffin Campus, Griffin, GA 30223, USA., Martinez-Espinoza AD; Department of Plant Pathology, University of Georgia, Griffin Campus, Griffin, GA 30223, USA., Bahri BA; Department of Plant Pathology, University of Georgia, Griffin Campus, Griffin, GA 30223, USA.; Institute of Plant Breeding, Genetics and Genomics, University of Georgia, Griffin Campus, Griffin, GA 30223, USA. |
| Abstrakt: |
Rhizoctonia large patch ( Rhizoctonia solani AG2-2 LP) significantly reduces turfgrass quality, aesthetics, and playability. Synthetic fungicides are commonly used for managing this disease, but they present high costs, potential for fungicide resistance, and environmental concerns. We conducted in vitro assays to test the effectiveness of three biofungicides, seven synthetic fungicides, and ten combinations against R. solani . We then assessed seven spray programs that included Bacillus subtilis QST713 and propiconazole, either alone or tank-mixed, on zoysiagrass 'El Toro' in a growth chamber and in field trials. Biofungicide B. subtilis QST713 reduced pathogen growth by up to 100% in vitro. B. subtilis QST713 alone or combined with synthetic fungicides and/or in rotation was as effective as the standalone synthetic fungicide, reducing disease severity and AUDPC by 81 and 77% (growth chamber) and by 71 and 52% (field), respectively, while maintaining acceptable turfgrass quality. Additionally, we screened zoysiagrass genotypes and advanced breeding lines against three R. solani isolates in growth chamber studies. Five genotypes and two breeding lines demonstrated resistance to Rhizoctonia large patch across isolates, highlighting their potential for developing disease-resistant cultivars. Our findings suggest that integrating biofungicides, resistant cultivars with chemical controls offer sustainable and effective strategies for managing Rhizoctonia large patch. |
