IFAS News

University of Florida

UF/IFAS imaging system can detect citrus greening before symptoms show

Topic(s): Agriculture, Citrus, Extension, New Technology, Research

Small lopsided fruit from greening-infected citrus tree.  Spring 2008 Impact Magazine image.  UF/IFAS File Photo.

GAINESVILLE, Fla. — A time-lapse polarized imaging system may help citrus growers detect greening before the plant’s leaves show symptoms, which should help growers as they try to fend off the deadly disease, a new University of Florida Institute of Food and Agricultural Sciences study shows.

For the new study, Won Suk “Daniel” Lee and Alireza Pourreza wanted to know how early citrus leaves with greening can be detected while they are pre-symptomatic. So they inoculated plants with the greening disease and put those leaves through a time-lapse imaging system.

There, they found starch in the leaves, an early sign of greening, said Pourreza, a former post-doctoral researcher in the UF/IFAS agricultural and biological engineering department. In their study, UF/IFAS researchers detected greening about one month after they infected the trees, he said.

Timely detection and removal of greening-infected trees are necessary to manage the disease, said Lee, a UF/IFAS agricultural and biological engineering professor and an author on the study.

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UF/IFAS FAWN system helps growers save water, money

Topic(s): Agriculture, Citrus, Crops, Departments, Economics, Extension, IFAS, New Technology, RECs, Research, Weather
Rick Lusher, standing, and George Braun, field site supervisor for FAWN, install a temperature sensor at a monitoring station located at UF's Plant Science Research and Education Unit in Citra, Fla.  Spring 2008 Impact Magazine image.  UF/IFAS File Photo.

See cutline below.

GAINESVILLE, Fla. — Citrus grower James Shinn remembers days when he and his workers would rush out as early as 5 p.m. to turn water pumps on to irrigate his crops. “We had no idea when the temperature would drop, so we had to get out there early and get the water going.”

Now, researchers with the University of Florida Institute of Food and Agricultural Sciences are helping state growers save millions of dollars via a tool to gauge weather in agricultural areas.

The Florida Automated Weather Network (FAWN), was started in 1998 to provide weather decision-making data in agricultural regions, said Rick Lusher, director of FAWN. While all National Weather Service tools are located at airports, FAWN stations are located in agricultural areas, he said.

“We estimate that if farmers use FAWN tools to determine when to irrigate their crops, they can save millions of dollars and millions of gallons of water,” Lusher said.

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Injecting citrus tree trunks with bactericide may help stem greening

Topic(s): Agriculture, Citrus, IFAS, New Technology, RECs, Research

Dr. Nian Wang, professor at the Citrus Research and Education Center.  Photo taken 03/08/16.

Please see caption below.

GAINESVILLE, Fla. — A chemical treatment known as a bactericide could help preserve citrus trees from the potentially deadly and costly greening disease, a new University of Florida Institute of Food and Agricultural Sciences study shows.

Citrus is estimated as a $10.9 billion-a-year industry in Florida and the finding could be key to helping the state’s citrus growers and its economy. Citrus greening has cost Florida $3.6 billion in economic damage since it was first discovered in 2005, according to previous UF/IFAS studies. It is projected that more than 80 percent of citrus trees have been infected by greening.

Nian Wang, a UF/IFAS associate professor of microbiology and cell science, led the latest study, which found that when a bactericide – in this case, oxytetracycline — is injected into the trunk of greening-infected citrus trees, it helps keep the trees alive by thwarting greening, also known as Huanglongbing, or HLB.

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UF/IFAS hires Eminent Scholar to help in fight against citrus greening

Topic(s): Agriculture, Announcements, Citrus, Departments, Entomology and Nematology, IFAS, Pests

Bryony Bonning

GAINESVILLE, Fla. — The University of Florida Institute of Food and Agricultural Sciences has added another soldier in its battle against citrus greening by hiring world-renowned entomologist Bryony Bonning. She has been named Eminent Scholar with tenure in the UF/IFAS entomology and nematology department.

Currently, Bonning is a professor of entomology at Iowa State University and director of the National Science Foundation Center for Arthropod Management Technologies, where she oversees cutting-edge research on insect physiology and pathology, and biotechnology. Bonning is a recognized authority in the development of new technologies for insect pest management, and a fellow of the Entomological Society of America and the American Association for the Advancement of Science.

“Dr. Bonning brings an outstanding record of accomplishment and cooperation, and we are confident she will work tirelessly to develop solutions for citrus pest management,” said Blair Siegfried, chair of the UF/IFAS entomology and nematology department. “Her combined experience and achievements make her ideally suited and deserving of the position.”

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UF/IFAS scientists zero in on better mandarin traits

Topic(s): Agriculture, Citrus, Crops, Cultivars, Economics, IFAS, RECs, Research

Dr. Fred Gmitter examining citrus trees in a greenhouse at the Citrus Research and Education Center in Lake Alfred.  Photo taken 03/08/16.

GAINESVILLE, Fla. — In their quest to develop higher quality mandarins, University of Florida Institute of Food and Agricultural Sciences researchers are zeroing in on the traits that will help them breed the best fruit.

Last year, they released the mandarin cultivar currently known as ‘7-6-27,’ which UF/IFAS researchers say is soaring with interest, and with more than 100,000 trees already ordered.

In a newly published study, Fred Gmitter, a UF/IFAS horticultural sciences professor, and his colleagues, including doctoral student Yuan Yu, found genetic markers for fruit quality traits that will be useful in future cultivar-breeding efforts.

Scientists wanted to know whether, for example, genetic markers – or “signposts,” as Gmitter calls them — for qualitative and quantitative traits in one group of mandarins lined up with these traits in other mandarins. Qualitative traits would be such things as peel or flesh color, while quantitative traits would include weight, size or shape.

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Strauss joins UF/IFAS fight against citrus greening

Topic(s): Agriculture, Announcements, Citrus, Crops, Extension, IFAS, RECs, Research, Soil and Water Science

Sarah Strauss

GAINESVILLE, Fla. — A new researcher has joined the University of Florida’s fight against citrus greening, which has devastated the state’s industry. Sarah Strauss, a soil microbiologist most recently from Davis, California, has accepted a position at the UF/IFAS Southwest Research and Education Center in Immokalee, Florida.

Strauss, an assistant professor with an Extension appointment, focuses on characterizing and managing plant and soil microbial community interactions to improve citrus and vegetable crop health and productivity. “The battle against citrus greening has looked at the rootstock, but not necessarily the soil. I hope my research can offer insight into what is going on with the soil of affected trees and how to improve the plant health by improving the soil,” she said.

According to Jack Payne, UF’s senior vice president for agriculture and natural resources, Strauss is the only soil microbiologist in Southwest Florida. “Dr. Strauss is a critical hire because she brings unique skills and talents to the search for a cure to citrus greening,” Payne said. “In addition, she is passionate about helping stakeholders in Florida succeed. It’s one of the main reasons that she came to UF/IFAS—to share her knowledge with those who need it most.”

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Entomologist joins UF/IFAS to help solve citrus greening

Topic(s): Agriculture, Announcements, Citrus, Crops, Entomology and Nematology, Extension, IFAS, New Technology, RECs, Research

Qureshi

FORT PIERCE, Fla. – An entomologist with 10 years of research focused on the state’s iconic citrus industry has joined the faculty of the University of Florida Institute of Food and Agricultural Sciences’ Indian River Research and Education Center.

Named Entomologist of the Year in 2012 by the Florida Entomological Society, Jawwad A. Qureshi was selected for a new position as assistant professor of entomology at UF/IFAS IRREC, near Fort Pierce, Florida. The UF/IFAS Fort Pierce location is part of the university’s statewide service to agriculture, providing research, extension and education for producers.

“Dr. Qureshi is one of the world’s few entomologists who have expertise in integrated pest management focused specifically on citrus,” said UF/IFAS IRREC interim director Ronald D. Cave. “His work is much needed in the region known worldwide for the highest quality fresh citrus product.”

According to Cave, Qureshi’s expertise with insect pest management for the citrus industry is critically valuable to the state’s citrus industry at a time when huanglongbing (HLB), also known as citrus greening, has had a negative impact on the crop statewide.

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New method tells growers more about citrus decay

Topic(s): Agriculture, Citrus, Economics, Environment, IFAS, New Technology, Pests, Research, Weather

Citrus Decay Detection 063016

Please see caption below story.

GAINESVILLE, Fla. — With citrus growers trying to save their groves in the wake of the deadly greening disease, a University of Florida Institute of Food and Agricultural Sciences researcher has found a new technique that could help growers answer a vexing question – why so much fruit is dropping to the ground prematurely.

If we know why fruit is dropping, we can better figure out what caused it to drop – factors such as temperature, wind, humidity, rainfall, citrus greening or other factors, said Wonsuk “Daniel” Lee, a UF/IFAS professor of agricultural and biological engineering.

While there is no known cure for greening, it’s important to know its locations and how much damage the disease caused at those sites so growers can mitigate the disease, a new study led by Lee says.

One indicator of the severity of damage is the number of dropped fruit. The other is how much the fruit has decayed once on the ground.

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UF/IFAS method detects 83% of immature citrus; helping cut costs

Topic(s): Agriculture, Citrus, Economics, Extension, IFAS, New Technology, Research

In this photo released from the University of Florida’s Institute of Food and Agricultural Sciences, Associate Professor Daniel Lee examines green oranges in a research grove on UF’s main campus in Gainesville – Friday, June 15, 2007. Lee is developing a computer system to recognize and count green oranges on trees. When perfected, the system could help growers manage and harvest their crops more efficiently. (AP photo/University of Florida/IFAS/Josh Wickham)

Please see caption below story.

GAINESVILLE, Fla. — University of Florida Institute of Food and Agricultural Sciences researchers have found a new way to detect immature citrus 83 percent of the time, which lets growers know where to apply fertilizer and water and perhaps save on labor costs for the $10.9 billion a year Florida industry.

By detecting green, immature citrus more accurately and efficiently, growers can plan when and where to apply nutrients when fruit is growing and estimate their yield and profit before harvest, said Daniel Lee, a UF/IFAS professor of agricultural and biological engineering.

Using a consumer-grade digital camera, Lee and his colleagues calculated color differences between the fruit and non-fruit objects, and identified fruit using a pre-determined fruit template. They also removed any incorrectly detected fruit via a shape analysis, Lee said. In a newly published study, scientists took 126 images of fruit on trees and detected 83 percent immature citrus, using a camera and the new algorithm. This method is different than the previous ones, which can detect fruit from the images taken farther away from the trees.

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UF/IFAS researcher to be honored as citrus engineer of year

Topic(s): Agriculture, Citrus, Crops, Honors and Appointments, IFAS, RECs, Research

Reza Ehsani 060616

Reza Ehsani

GAINESVILLE, Fla. — A University of Florida Institute of Food and Agricultural Sciences researcher who uses steam to help treat citrus trees infected by greening, will receive this year’s Citrus Engineer of the Year Award.

Reza Ehsani, a UF/IFAS associate professor of agricultural and biological engineering, will receive the award June 21 at the 59th Biennial Citrus Engineering Symposium at the UF/IFAS Citrus Research and Education Center (REC) in Lake Alfred, Florida.

“I am very honored and grateful to receive this award,” said Ehsani, a faculty member at the Citrus REC. “It means a lot to me because it shows my efforts and contributions to the engineering aspects of citrus production have been of value and have been noticed and recognized by my peers.”

Michael Rogers, director of the Citrus REC, touted Ehsani’s work in using steam to help citrus trees infected by greening, or HLB as it’s known in scientific circles.

“The premise of his work is that, by using steam to kill the bacteria in the above-ground portion of the tree, growers can buy additional years of productivity of a grove before it must be replanted,” Rogers said. “The machine designs he has created are being used by several startup companies around the state. He definitely deserves the recognition.”

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