What to Do if Citrus Black Spot Isn’t Near

Ernie Neffblack spot

University of Florida Institute of Food and Agricultural Sciences researcher Megan Dewdney addresses what growers should do if citrus black spot isn’t near their groves. She summarizes a presentation she made at a recent growers’ workshop in Sebring. “My few pieces of wisdom have been to tell people to just be conscious of their area and know whether they are …

PFD

Hands-On Training Scheduled at UF/IFAS Citrus Workshop

Daniel CooperCitrus, Citrus Greening, Industry News Release, Research

Florida citrus growers will learn about the latest research from the University of Florida Institute of Food and Agricultural Sciences and test new technology at a workshop in Sebring, Sept. 25-26. UF/IFAS Extension Highlands County is working with statewide UF/IFAS Citrus Extension faculty to bring the latest in scientific studies and a hands-on learning experience to growers. Faculty will cover …

growers

New Florida Citrus Production Guide Debuts at Citrus Expo

Daniel CooperCitrus Greening, Industry News Release, Production

Beginning this week, Florida citrus growers will have an updated resource to help them keep groves productive despite the ever-present threat of huanglongbing, the bacterial malady also known as HLB or citrus greening disease. Experts with the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) have just completed a 180-page technical handbook, “Florida Citrus Production Guide 2018-2019.” It …

Outlook for Postbloom Fruit Drop

Tacy CalliesDiseases

By Megan M. Dewdney, Tripti Vashisth and Ariel Singerman In 2017, the damage from postbloom fruit drop (PFD) was lower than the previous three years. This was mainly due to the low rainfall accumulation in late winter and early spring. The long bloom with relatively few flowers at any one time made the decision of when to apply a fungicide …

sweet orange scab

Sweet Orange Scab Detected in Alabama

Tacy CalliesDiseases

U.S. Department of Agriculture (USDA) officials have confirmed the first detection of sweet orange scab (SOS) in Alabama. The fruit sample was collected in Baldwin County by Alabama Department of Agriculture and Industries’ (ADAI) plant protection inspectors during a delimiting survey for citrus greening disease. The Auburn University Plant Diagnostic Clinic provided the initial diagnosis of SOS, and USDA Animal …

A Look Back at 100 Years of Citrus Innovation

Tacy CalliesHistory

By Beverly James, Alec Richman, Brad Buck, Samantha Grenrock and Tom Nordlie The year was 1917. In April, the United States entered World War I. Florida’s population was fast approaching 1 million, and agriculture was the state’s most important economic driver. Citrus cultivation, introduced to Florida 400 years earlier by Spanish explorers, had spawned an industry following the Civil War. …

black spot

Keeping Young Trees Free of HLB

Ernie NeffHLB Management, Thermotherapy

Plant pathologist Megan Dewdney was one of the University of Florida Institute of Food and Agricultural Sciences researchers who summarized scientific presentations made at the 2017 International Research Conference on HLB. She and others spoke at an HLB Grower Day in Lake Alfred, putting the complex presentations into terms more understandable to those who aren’t scientists. Dewdney discussed young tree …

Will You Be Ready for Postbloom Fruit Drop?

Tacy CalliesDiseases, PFD

By Megan M. Dewdney Again in 2016, postbloom fruit drop (PFD) caused widespread problems in Florida groves. There were multiple factors that contributed to the outbreak in 2016. The primary factor was likely the extended bloom that many saw because of a combination of tree stress caused by huanglongbing (HLB) and the very warm winter. Bloom in some groves was …

Sneak Peek: January Citrus Industry Magazine

Tacy CalliesCitrus

A new year is just around the corner and so is the next issue of Citrus Industry magazine. The January issue features a cover story on Callie Walker, chief of the Bureau of Pest Eradication and Control for the Florida Department of Agriculture. Learn about Walker’s deep roots in citrus and what she is doing about the abandoned grove problem. …

Control of Stem-End Rot of Fresh Citrus

Tacy CalliesDiseases

By Mark A. Ritenour, Jiuxu Zhang and Megan M. Dewdney Decay of fresh citrus fruit is most often caused by fungal pathogens that grow and develop in the hot and wet conditions typical in Florida. While green and blue molds (Penicillium digitatum and Penicillium italicum) and sour rot (Galactomyces citri-aurantii) are the most common postharvest citrus diseases worldwide, the subtropical …

Controlling HLB with Thermotherapy: What Have We Learned So Far?

Tacy CalliesCitrus Greening, Thermotherapy

By Reza Ehsani, Megan Dewdney and Evan Johnson In the last two years, many growers looked at thermotherapy as a way of keeping HLB-affected citrus trees in production until a more permanent solution could be developed. It has been shown that thermotherapy can kill HLB-causing bacteria under controlled environments. But the exact time and temperature is not known, and it …

New Knowledge on Citrus Black Spot

Josh McGillCitrus

By Megan Dewdney, Jeff Rollins, Nan-Yi Wang and Ke Zhang Citrus black spot (CBS) has become established in the groves of Collier and Hendry counties. In other citrus-growing regions of the world where CBS is present, the sexual fruiting bodies of the fungus, known as pseudothecia, form in decomposing leaf litter. Approximately 50 to 180 days following leaf drop, the …

Bactericide Trials

Josh McGillCitrus, Citrus Greening

Growers should conduct bactericide trials Multiple meetings have been held across the state to discuss the three bactericides made available to citrus growers by the crisis declaration issued by Florida Commissioner of Agriculture Adam Putnam. Growers have many concerns surrounding these products, such as efficacy rates and economic viability. University of Florida associate professor and Extension specialist Megan Dewdney cautions …

Suggested Use Patterns for Antibacterial Products on Citrus

Kelsey FryCitrus

Megan Dewdney and Jim Graham with University of Florida’s Institute of Food and Agricultural Sciences (UF/IFAS) have developed a suggested use pattern for the three antibacterial products that were recently allowed for use on citrus under a Crisis Declaration by Florida Commissioner of Agriculture Adam Putnam. The new document, titled “Suggested Antibiotic Use Pattern for Huanglongbing Management,” was put together …

Citrus Industry This Week: Science Brings Optimism; Fungal Diseases

Kelsey FryCitrus

Today’s issue of Citrus Industry This Week includes a report on bactericides from Doug Bournique, and Megan Dewdney discusses anticipated spring fungal diseases that growers will need to cope with. Want to learn more? Click here to subscribe. Click here to subscribe to the monthly Citrus Industry magazine. Sponsored ContentTake Advantage of Rising Temperatures to Treat for Fire AntsJuly 1, …

Spring Will Bring Citrus Fungal Diseases

Kelsey FryCitrus

Springlike weather in Florida, likely just around the corner, will bring an array of citrus fungal diseases that growers will need to cope with. University of Florida researcher Megan Dewdney reports on some of the diseases that can be expected. Download Audio Sponsored ContentTake Advantage of Rising Temperatures to Treat for Fire AntsJuly 1, 2025Take the Sting Out of Fire …