reduce fruit drop

Using GA and 2,4-D to Reduce Fruit Drop

Daniel CooperFruit Drop, Tip of the Week

By Tripti Vashisth, Mary Sutton and Taylor Livingston Author’s note: This Tip of the Week applies to HLB-affected sweet oranges in Florida. Preharvest fruit drop remains a major concern for HLB-affected sweet oranges. Research shows that both gibberellic acid (GA) and 2,4-D can help reduce fruit drop, but the combination of GA and 2,4-D provides the greatest reduction. In a …

PULAs

A New Way To Stay Current With PULAs

Daniel CooperPesticides, Regulation

The U.S. Environmental Protection Agency (EPA) announced a new email subscription feature to help pesticide users quickly receive updates from the Bulletins Live! Two system. The updates will include notifications about new Pesticide Use Limitation Areas (PULAs) and changes to existing PULAs. EPA developed this feature in response to requests from pesticide users who asked for better access to Bulletins …

fruit thinning

Managing Alternate Bearing With Fruit Thinning

Daniel CooperProduction

Three University of Florida Institute of Food and Agricultural Sciences researchers recently authored an article explaining how to manage alternate bearing in citrus with fruit thinning. Alternate bearing is the tendency for trees to carry a heavy crop one year, followed by a season of very little fruit. The authors are Masood Jan and Muhammad Shahid with the North Florida …

Challenge 250

Challenge 250 to Strengthen Response to Invasive Species

Daniel CooperDiseases, Pests

A new initiative aims to strengthen the University of Florida Institute of Food and Agricultural Sciences’ (UF/IFAS) ability to respond rapidly when a new invasive pest or plant disease threatens. Edward “Gilly” Evans, director of the UF/IFAS Tropical Research and Education Center (TREC), launched the Challenge 250 initiative. Named in recognition of the nation’s 250th anniversary, it aims to raise …

Wedgworth

Wedgworth Leadership Institute Selects Class XIII

Daniel CooperEducation, Florida

The Wedgworth Leadership Institute for Agriculture and Natural Resources (WLIANR) has selected 30 Florida participants for Class XIII of its two-year leadership development program. The program is designed for emerging agriculture and natural resources professionals who aspire to greater leadership responsibilities in the private and/or public sectors.  The program will begin in November and include 11 seminars spanning 55 days. …

citrus breeder

Citrus Breeder Continued His Passion to the End

Daniel CooperBreeding

Despite cancer-related ills in recent years, citrus breeder Fred Gmitter continued his work passion, which included development of trees that were more tolerant of or resistant to HLB. “That was our mission,” said Jude Grosser, his fellow citrus breeder at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center. Grosser said Gmitter continued …

speed

New Tool Speeds Regeneration of Gene-Edited Citrus

Daniel CooperBreeding, Research

Editing a plant’s genes is only half the battle. Before a new, improved trait can ever reach a farmer’s field, scientists must be able to grow a whole plant from just a few edited cells. That process can be slow, unreliable and, for some plant species, impossible. A new study describes a way to speed up that bottleneck across crops, …

Kaolin

How To Keep Kaolin on Your Trees Through the Rain

Daniel CooperHLB Management, Research, Tip of the Week

By Christopher Vincent and Rashmi Kumari Florida summers come with intense sunlight, high temperatures and frequent rain. Just as people use sunscreen to protect exposed skin from intense sunlight, plants can benefit from a protective coating on exposed leaf and fruit surfaces. One way to provide this protection is by spraying a kaolin clay particle film on the tree. Although …

Citrus Field Day

Citrus Field Day Featured OLL Varieties and New Rootstocks

Daniel CooperEvents

The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) hosted a field day in Jason Griffin’s Polk County grove in mid-September. Griffin has been a long-time collaborator with the university’s citrus breeding program. The event featured many of the later-season OLL varieties developed by Jude Grosser, UF/IFAS professor of plant cell genetics. The OLL line of later-maturing varieties …

Latt Maxcy

PIECES OF THE PAST: More Than a Century of Citrus Commitment

Daniel CooperPieces of the Past

By Brenda Eubanks Burnette I was driving past the Latt Maxcy Corporation recently and found myself remembering when I first met Pat and Patricia Wilson. Pat carried a quiet authority — steady and observant, with a twinkle in his eyes. But the person who truly commanded the room was his petite wife, Patricia. Her energy and determination were unmistakable, and …

Rabobank

Brazilian OJ Industry ‘Challenging,’ Rabobank Reports

Daniel CooperBrazil, Orange Juice

According to a September 2026 Rabobank report, the current environment for Brazilian orange juice (OJ) remains challenging for both farmers and the industry, with prices still low but starting to show some slightly positive signs. It reported that spot orange prices for the industry increased from BRL 25/box (approximately $4.30/box in U.S. dollars) in May to BRL 31/box (approximately $6.03/box …

water

Water, Education and Succession Among California Citrus Issues

Daniel CooperCalifornia Corner, Education, Water

Water, education of politicians and consumers, California’s next governor and farm succession were among citrus-related topics addressed recently by Jacob Villagomez, director of governmental affairs for California Citrus Mutual. WATER Water remains one of the industry’s biggest concerns, according to Villagomez. He said California’s increasingly intense heat can stress citrus trees, contribute to leaf curling, cause sunburn-related scarring and sometimes …

field day

CITRUS NURSERY SOURCE: Citrus Field Days Set for Fall

Daniel CooperCitrus Nursery Source, Events

By Peter Chaires This fall offers Florida citrus growers several opportunities to see the latest research, evaluate new varieties and connect with researchers in the field. From open houses and variety displays to research tours and field days, these events provide a firsthand look at work that could shape the future of the citrus industry. IRREC OPEN HOUSE The University …

chilli thrips

Weed Management Key To Reducing Chilli Thrips in CUPS

Daniel CooperCUPS, Pests, weeds

Chilli thrips’ damage in Florida citrus under protective screen (CUPS) should motivate growers to manage weeds more effectively. Lauren Diepenbrock, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) associate professor and entomologist, shared that advice during this year’s Citrus & Specialty Crop Expo in Fort Myers, Florida. Diepenbrock said chilli thrips feed on citrus trees but they also …

royalty reimbursement

CRAFT Announces Royalty Reimbursement

Daniel CooperCRAFT

The Citrus Research and Field Trial (CRAFT) Foundation recently announced the addition of a royalty reimbursement component to Cycle Eight, along with other updates. GROWER ASSISTANCE The royalty reimbursement provides growers with additional assistance to help offset the cost of planting eligible citrus trees and utilizing eligible biological delivery technologies that require a royalty payment. This new opportunity expands on …

Mexfly

Mexfly Quarantine Removed in Hidalgo County, Texas 

Daniel CooperPests, Regulation, Texas

The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) has removed the Mexican fruit fly (Mexfly) quarantine in Hildalgo County, Texas, designated the Peñitas-Granjeno quarantine. The action was taken in cooperation with the Texas Department of Agriculture (TDA). It releases 58.66 square miles from quarantine, including 45.03 acres of commercial citrus. APHIS originally established the quarantine, restricting …

Expo

Citrus & Specialty Crop Expo Makes Triumphant Return to Fort Myers

Daniel CooperCitrus Expo

By Tacy Callies, Clint Thompson and Frank Giles The Citrus & Specialty Crop Expo provided vital information to steer growers to long-term sustainability. After a brief stint in Tampa, the annual event returned home to Fort Myers, Florida, its original location. Citrus and specialty crop growers, along with vendors and industry specialists, convened Aug. 12–13 at the Caloosa Sound Convention …

trunk injection

HLB Research Looks to Automate Trunk Injection

Daniel CooperHLB Management, Technology

As oxytetracycline (OTC) trunk injection becomes an important tool for managing HLB, researchers are looking for ways to make the labor-intensive treatment faster, more efficient and less expensive. Part of a research paper published in Tropical Plant Pathology discusses an automated trunk-injection system being developed for HLB-affected citrus. The authors of the paper, titled “Integrated pest management strategies to address …

selections

Fresh Market Selections for CUPS

Daniel CooperCUPS, Fresh

By John M. Chater Arnold Schumann, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) professor at the Citrus Research and Education Center (CREC), pioneered the citrus under protective screen (CUPS) production method in Florida. He started his CUPS work over 12 years ago to help provide horticultural tools to growers to continue producing high-quality fruit by means of …

resistant trees

Considerations When HLB-Resistant Trees Arrive

Daniel CooperHLB Management, Research

The development of citrus varieties that can resist HLB could eventually change how growers manage the disease. However, a recent study suggests the transition may not be as simple as planting resistant trees and stopping control of the Asian citrus psyllid (ACP) that spreads HLB. A paper about the research, published in the April 2026 issue of Agricultural Systems, examines …