Albert Culbreath, research plant pathologist at the University of Georgia, started his career in Tifton back in 1989. Culbreath came to the university to work on foliar diseases of peanuts, but tomato spotted wilt virus made an appearance and he has been working on that virus ever since his arrival to Tifton.
“We’ve made a lot of progress. The virus progressed extremely rapidly in those first few years by the mid-90s,” Culbreath says. “TSWV was a significant part of crop losses, and the virus came close to putting us out of peanut production. I’m proud to be part of an integrated management research extension team that addressed the problem.”
Through the years, the team of researchers working on TSWV has made a lot of strides in managing the virus. An integrated approach has been an excellent example of that, Culbreath says.
“No production practice actually provides adequate control of the disease in the field, but we’ve put together multiple factors that all work together so we can have a huge impact on managing TSWV,” Culbreath says.
Culbreath continues to work on spotted wilt and is proud of the progress the research team has made through the year.
“We’re living with the virus now, but it is still an extremely important factor in our peanut production,” Culbreath says. “Our losses to spotted wilt have been up the last couple of years.”
Culbreath’s research program is geared towards helping breeders develop better and better varieties and better resistance to spotted wilt so that it will hold up to it. Currently there are no varieties with full immunity to the virus.
Through Culbreath’s integrated research program, he helps with mapping and marker development that will hopefully help the next generation of breeders and plant pathologists. His research focus continues to compare advanced breeding lines from multiple breeding programs and the lines resistance to spotted wilt.
Culbreath also compares the available peanut varieties response to Thimet insecticide since spotted wilt is vectored by thrips. Thimet is the only insecticide available that controls thrips and gives some suppression of spotted wilt.
According to Culbreath, the research is a team effort which includes researchers and extension professionals across multiple disciplines.
The virus is complicated but together the team of researchers are making progress.
“When you have a virus that’s complicated like spotted wilt, then it takes a team approach,” Culbreath says. “We are continuing to make progress, but it seems like the virus stays two steps ahead of us sometimes.”
There are some promising lines in the breeding program that has resistance to spotted wilt but for now the variety, Georgia-12Y is the best line with resistance to spotted wilt. In years with heavy spotted wilt pressure, Culbreath says growers need to be mindful of the optimum planning date, higher seeding rates and the insecticide Thimet.
“We are continuing our work on spotted wilt by putting together as many factors as possible that are available now and looking for new and better resistance in the breeding lines that we have and what will be coming down the pipe,” Culbreath says. “So, hopefully we can eventually get to where spotted wilt is not a factor in peanut production, but for the moment, I’m afraid it’s still a mighty strong enemy.”
David Bertioli is a professor in the University of Georgia Plant Breeding, Genetics and Genomics program. He works closely with Soraya Bertioli in what is known as the wild peanut lab. Now to explain what the wild peanut lab is, let me take you back five or ten thousand years to South America when the first inhabitants were growing wild peanuts. That area is now known as Argentina and Bolivia.
University of Georgia plant pathologist Tim Brenneman studies peanut diseases and a range of pests that attack peanuts. During the 2023 Georgia Peanut Tour visit to the University of Georgia Attapulgus Research and Education Center, Brenneman discussed nematodes and the impact this pest has on peanuts.
During the 2023 Georgia Peanut Tour, Scott Monfort, University of Georgia Extension peanut agronomist, provided an update on the peanut crop and some of the some of the issues growers have dealt with throughout the season.
Jake Fountain, mycotoxin and post-harvest pathogen specialist at the University of Georgia, provided an update on his research program during the 2023 Georgia Peanut Tour. Fountain’s research program primarily focuses on aflatoxin issues in peanuts and also other crops overall.
Nino Brown, University of Georgia peanut breeder provided an update to 2023 Georgia Peanut Tour attendees on the peanut breeding program at the university. Brown works closely with Bill Branch, peanut breeder at the University of Georgia, as they work to develop new cultivars or varieties of peanuts for growers in Georgia and beyond.
The 35th annual Georgia Peanut Tour kicked off with a Hot Topics seminar on Tuesday, Sept. 12 at the Cloud Livestock Pavilion in Bainbridge, Georgia. The seminar provided an update on the 2023 peanut crop as well as an update on the farm bill and other legislative activities that can have an impact on the peanut industry. Each year the seminar also highlights some of the latest hot topics happening in the industry and this year’s special focus included advancements in integrative precision agriculture for enhanced peanut production and processing. The speakers provided an overview of the University of Georgia FoodPIC Center and the USDA Peanut Germplasm Collection as well as information on irrigation technologies and precision agriculture in peanut production.