2013 Annual Report
1a.Objectives (from AD-416):
To characterize crop and weed hosts, geographic range and insect vectors of Groundnut ringspot virus to facilitate development of better management options for this newly emerging virus infecting vegetables including tomato.
1b.Approach (from AD-416):
The nucleic acid-based diagnostic test for Groundnut ringspot virus previously developed by ARS Scientists will be used to analyze natural and/or experimental plant hosts (crops and weeds) for this virus to develop a host and geographic range for the virus. Locally important thrips species will be analyzed for their ability to transmit the virus. The information generated from this research should be useful to USDA-NIFA, fresh-market vegetable growers, the specialty crop industry, Florida Cooperative Extension Service, private crop consultants and FDACS to guide development of management strategies for this newly emerging virus.
This research relates to inhouse project objectives 1). Characterize ecology, biology, epidemiology, molecular genetics, and vector and host (crop and weed) interactions of domestic, exotic, newly emerging, and re-emerging pathogens, 2). Develop/refine rapid, sensitive reliable detection/sampling methods for pathogens, and 3). Develop or improve comprehensive integrated disease management strategies.
We have documented the geographic expansion of GRSV in Florida although it remains confined to the peninsula. TCSV was also identified in this region. Surveys of the southeastern U.S. have only identified TSWV in tomatoes with tospovirus symptoms from outside of Florida. Additional hosts of both GRSV and TCSV have been identified by experimental host range experiments and field surveys. Importance of locally important thrip species in transmission of GRSV has been evaluated.