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Funded Project |
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Funding Program:
Enhancement Grants - Special Projects |
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Project Title:
Management of Bacterial Spot of Pepper Through On-Farm Evaluation of Resistant Commercial Genotypes |
Project Director (PD):
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Lead State: FL Lead Organization: University of Florida Everglades Research and Edu. Center |
| Undesignated Funding: $22,562 |
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Start Date: Jul-01-2007 End Date: Jun-30-2008 |
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Pests Involved: bacterial spot |
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Site/Commodity: pepper |
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Summary:
Bacterial spot, caused by Xanthomonas euvesicatoria, is the most important disease of the valuable Florida sweet bell pepper crop. Chemical control of this disease has been mediocre at times, in part due to the widespread occurrence of strains of the pathogen resistant to copper, the pesticide (bacetricide) most commonly sprayed for bacterial spot. There is strong grower interest in using pepper varieties with resistance to one or more races of X. euvesicatoria for management of bacterial spot in lieu of frequent copper bactericide applications. Because appearance of "new" races has defeated single, dominant genes for specific X. euvesicatoria races, gene pyramids offer more practical control potential in the field. For example, prior to 1989, race 2 of X. euvesicatoria was predominant in southern Florida. Responding to this situation, a private seed company released two horticulturally desirable cultivars with the Bs1 gene conferring hypersensitive resistance to race 2 in the 1989-90 season. Unfortunately, a sudden shift to a prevalence of race 1 strains defeated the Bs1 gene and was responsible for major losses on cultivars used commercially with and without the Bs1 gene. The objectives of this capstone effort are to evaluate 25-27 pepper genotypes for resistance to bacterial spot, including some entries with multiple or pyramided race-specific resistance genes; determine the dominant race(s) of X. euvesicatoria attacking plots in southern Florida; evaluate cultivars for desirable horticultural traits, such as marketable yield, blockiness, and lobe number; and provide educational material to growers, concerning these cultivars. Large-scale, replicated field trials will be conducted in the two major pepper production areas of southern Florida (east and west coasts). Ratings of bacterial spot severity will be made and races responsible for epidemics will be determined. Plots will be harvested 3 times and extensive horticultural data collected and analyzed. Field days will be conducted at both locations. Information will be sent to stakeholders on a CD for computer access and perusal. Publications will be written summarizing data and archived in the University of Florida Electronic Document Information Source. At lest one peer-reviewed journal article will be prepared.
Objectives: In two on-farm field trials in southern Florida, the following objectives will be pursued: 1) evaluate 25-30 named cultivars or other cultigen entries for resistance to bacterial spot. 2) Determine the predominate race or races of X. euvesicatoria responsible for naturally occurring epidemics in demonstration plots. 3) Determine horticultural characteristics of all entries, to include total yield, marketable yield, blockiness, lobe number, and wall thickness. 4) Present information in several educational platforms to stakeholders, including growers, consultants, seed company personnel, and agribusiness sales representatives. |
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