Posts Tagged: Fusarium Wilt
Researchers identify genes making strawberries resistant to Fusarium wilt
Resistant varieties to be released later this year to growers
Strawberry losses from Fusarium wilt could become less of a threat after researchers at the University of California, Davis, discovered genes that are resistant to the deadly soilborne disease.
The findings, published in the journal Theoretical and Applied Genetics, are the culmination of several years' work, and the discovery will help protect against disease losses, said Steve Knapp, director of the Strawberry Breeding Program at the college.
“What we've accomplished here is important and it's valuable for the industry and it's going to protect growers,” Knapp said.
Strawberries are a key crop in California, where about 1.8 billion pounds of the nutritious fruit are grown each year, making up roughly 88% of what is harvested in the United States.
Finding the genes could prevent a Fusarium wilt pandemic.
“The disease has started to appear more often up and down the state,” said Glenn Cole, a breeder and field manager with the Strawberry Breeding Program. “Once the wilt gets in, the plant just crashes. You have total die out.”
Searching for resistance
UC Davis scientists screened thousands of strawberry plants in the college nursery and took DNA samples. They then used genetic screening and developed DNA diagnostics to identify genes that are resistant to the primary race of Fusarium wilt.
“The genes have been floating around in the strawberry germplasm for thousands of years,” Cole said, but no one worked to identify them.
This latest development brings “strawberry into the 21st century in terms of solving this problem,” Knapp said.
Protecting future crops
This work means breeders can introduce the resistant gene into future strawberry varieties. This fall the program will release new cultivars that have the Fusarium wilt resistance gene. And the DNA diagnostic tools will help breeders respond to new Fusarium wilt variants that develop.
“There will be new threats and we want to be prepared for them,” Knapp said. “We want to understand how this works in strawberries so that as new threats emerge, we can address them as rapidly as possible.”
“If you don't have fusarium resistance, you're done,” Cole said. “The disease could be around more than you think.”
Fusarium wilt hasn't traditionally been an issue but when the fumigant methyl bromide was phased out in 2005, things changed. The disease was in the soil and without the fumigant, instances of wilt increased, especially in areas where crops weren't rotated.
Breeding new varieties
Knapp and Cole have informed the industry about current strawberry varieties that have the resistance so they can select plants with that added protection. The new resistant varieties coming out later this year will be suitable for several growing seasons.
“It's a big deal,” Cole said. “Everything is incremental in plant breeding, but it's a big deal.”
Plant scientists have been breeding strawberries at UC Davis since the 1930s and they have released more than 60 patented varieties through the public breeding program.
All of the work happened at UC Davis. Dominique Pincot, Mitchell Feldmann, Mishi Vachev, Marta Bjornson, Alan Rodriguez, Randi Famula and Gitta Coaker from the Department of Plant Sciences, and Thomas Gordon from the Department of Plant Pathology contributed to the research, as did Michael Hardigan and Peter Henry who are now at the U.S. Department of Agriculture Agricultural Research Service and Nicholas Cobo who is at University of La Frontera in Chile.
The research was funded by UC Davis and grants from the USDA National Institute of Food and Agriculture Specialty Crop Research Initiative.
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Gardening Confusions
By Susanne von Rosenberg, UC Master Gardener of Napa County Some gardening advice...
Not all wilted leaves are caused by lack of water. (gardeningknowhow.com)
Waterlogged soil could be a cause for wilted leaves. (greenmylife.in)
Fusarium wilt in strawberry. Known to affect tomatoes, too. (ucanr.edu)
Verticillium wilt on tomatoes. Caused by a soil fungus. (ucanr.edu)
Vertebrate pests damage roots, leading to loss of water to leaves. (ucanr.edu)
Using tree chips instead of bark chips conserves water. (sonorantreesvc.com)
Read the label. Follow directions exactly. (bgi-usa.com)
Woven landscape fabric is water and air permeable. (flowerarmor.com)
Weeds -do- grow through landscape fabric, and mulch. You might have fewer weeds, but they'll still need to be removed! (homeguides.sfgate.com)
Blog, Linda Chalker-Scott Horticultural Myths (pinterest.com)
Fusarium Wilt in Garbanzos
A little over a month ago, I visited some contiguous garbanzo bean fields in southern San Joaquin...
Fusarium Wilt in Garbanzos
A little over a month ago, I visited some contiguous garbanzo bean fields in southern San Joaquin...
Dogs to the Rescue
On a recent trip to Florida we saw a dog in action locating avocado trees that had been attacked by the Redbay ambrosia beetle which carries the fungus Raffalea lauricola which is a similar pest/disease complex that is found in California with the Polyphagous/Kuroshio Shot Hole Borer and Fusarium Euwallacea that leads to Fusasrium Wilt in avocado. The fungus gives off a certain odor that the dog is trained to smell and along with the human trainer goes around the orchard to identify infected trees. The trees can then be removed so that they don't act as a reservoir of infection that can be spread to other trees by the beetle. The dog seemed to work pretty fast. Depending on the acreage covered, the handler says they charge $150 per acre to find diseased trees. This can happen before more advanced symptoms show up that humans can see. This technology could be used in identifying other tree diseases, such as Huanglongbing, citrus canker and Phytophthora, along with others.
Dog has found a laurel wilt infected tree that will soon be removed. (Tim Spann).
dog identifying lw tree