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Funded Project |
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Funding Program:
Regional IPM Grants (S-RIPM) |
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Project Title:
Reduced-Risk Pre- and Postharvest Management of Multiple Fungicide -Resistant Populations of the Peach Brown Rot Fungus Monilinia fructicola |
Project Directors (PDs):
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Lead State: GA Lead Organization: University of Georgia |
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Cooperating State(s):
Mississippi |
| Research Funding: $139,989 |
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Start Date: Jul-14-2009 End Date: Jul-13-2012 |
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Pests Involved: brown rot |
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Site/Commodity: peaches |
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Summary:
The goal of this research project is to develop a system for economically viable control of brown rot (Monilinia fructicola), the key fruit disease on peaches, in the face of a rapidly deteriorating fungicide resistance situation. Isolates resistant to DMI fungicides have been detected in Georgia 5 years ago and in other southern states during the 2007 and 2008 seasons. DMI-resistant isolates are predisposed toward resistance development to the QoI (strobilurin) fungicides, and QoI-resistant isolates have been detected in South Carolina in 2007 and in Georgia in 2008; these isolates represent the tip of the iceberg of emerging QoI resistance in the South, leaving this major peachproducing region without effective tools for managing brown rot. We propose a two-pronged approach to manage multiple fungicide resistance in M. fructicola based on integrating reduced-risk pre- and postharvest treatments. Pre-harvest applications will focus on combinations of compounds that enhance fruit resistance to infection and inhibit production of cell wall-degrading enzymes by M. fructicola, including calcium, chitosan, and iron. Under increased brown rot pressure due to resistance in the orchard, the judicious use of postharvest treatments will increase in importance. Thus, our second objective will optimize application parameters for fludioxonil (Scholar), a reduced-risk postharvest fungicide that is highly effective against brown rot but whose current applications patterns in southern packinghouses result in inadequate fruit coverage that could jeopardize disease control efficacy and lead to development of fludioxonil resistance. Economic analyses and outreach efforts conducted under a third objective will ensure that the new knowledge and technologies developed here will be put into practice.
Objectives: 1) Evaluate pre-harvest applications of materials that enhance fruit resistance to infection and inhibit production of cell wall-degrading enzymes by M. fructicola; 2) Optimize application parameters for fludioxonil (Scholar), a reduced-risk postharvest fungicide; 3) Conduct economic analyses to determine production risk minimization levels and engage in outreach and technology transfer with industry members. |
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