What is in this article?:
- Tomato yellow leaf curl virus getting worse in Georgia
- Most common management approach
• A University of Georgia researcher says eradicating the disease may not be possible.
• However, work continues to be done to help farmers select resistant varieties and manage their risks.
UNIVERSITY of Georgia Entomologist Rajagopalbabu Srinivasan examines a tomato plant on a plot on the Tifton campus.
Most common management approach
The most common approach to managing the virus is to use insecticides. That tactic has proven to be futile time and again, though, according to Srinivasan. Insects with the virus can transmit it within five minutes of feeding, meaning a “super-efficient” chemical is needed to contain the spread of the virus.
In affected areas, farmers sprayed once a week last year and the virus still prevailed, he said.
“It kind of tells us that insecticides can be effective to suppress the insects but not the viruses that they transmit,” Srinivasan said.
“In such scenarios, we’ll have to weigh our options and come up with some other tactics, which include resistant varieties and cultural tactics.”
Despite the availability of resistant cultivars, growers have been hesitant to use them. “(Farmers) believe that the resistant cultivars have poor horticultural attributes and often are not preferred by consumers. Growers have not actually resorted to planting these varieties because when these varieties came out, in the initial stages, they didn’t produce good tomatoes,” he said.
Srinivasan said farmers prefer susceptible varieties because they “produce really nice-looking tomatoes with good shelf life.” CAES researchers are currently evaluating new resistant varieties they believe will be good options for growers.
Another option that growers will have in the future is a risk-assessment website that Srinivasan hopes will be implemented within the next couple of years.
“This website will be developed with funding from the USDA-AFRI program. The growers can actually go into this website and plug in information to see how much risk they’re going to have if they plant with the options they currently have planned for,” Srinivasan said. “The website would also give growers options to minimize risks.”
Despite the virus’ persistence in south Georgia, Srinivasan and his fellow CAES entomologists David Riley and Stormy Sparks are confident management will continue to improve.
“At this point, we’ve passed the elimination or eradication stage as the virus has already been here since the late 1990s. The options we have now are to manage this virus rather than eradicate it,” Srinivasan said.
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