Plant pathologist Megan Dewdney with the University of Florida Institute of Food and Agricultural Sciences offers suggestions for managing citrus canker at different times of the year. She is an associate professor at the Citrus Research and Education Center (CREC) in Lake Alfred. Dewdney suggests that copper sprays begin when fruit reach three-eighths of an inch in diameter in groves …
When to Be on Canker Alert
Citrus fruit is susceptible to canker after it reaches three-eighths of an inch in diameter, University of Florida Institute of Food and Agricultural Sciences Extension pathologist Megan Dewdney told growers this winter. “Once you get to that point and we get rain, then all bets are off as to whether you will keep canker out,” Dewdney said at a winter …
Citrus Canker Management: Seasonal Preparation and Hurricane Irma’s Influence
By Evan G. Johnson The citrus canker season is just over a month away, so it is time to plan a canker management program to avoid fruit drop or fresh market quality loss. With the current state of HLB in Florida, it is easy to forget some of the other potentially crop-destroying pests in the grove, especially when, unlike HLB, …
Homeowners to Receive Compensation After 17-Year Canker Battle
A legal fight over citrus canker has finally come to a close after 17 years. Citrus canker, which reappeared in Florida in 1986, is a bacterial disease that can cause blemishes on the fruit, and in some cases, can cause fruit to drop prematurely. Canker is usually spread by the wind, making it difficult to control. In 2000, Florida was …
How Will Irma Affect Citrus Canker Management?
By Evan G. Johnson The citrus canker season is quickly approaching again, so it is time to start planning your canker management program to avoid fruit drop and fresh-market quality loss. It is easy to forget the importance of controlling citrus canker with the current state of HLB in Florida. However, citrus canker can cause almost complete crop loss if …
Homeowners Want Quick Ruling on Canker Payment Veto
from News Service of Florida Florida’s top court needs to decide this week on Gov. Rick Scott’s veto of $37.4 million in compensation to homeowners that had healthy citrus trees cut down by the state, attorneys challenging the veto argued in documents filed Tuesday. The class-action lawsuit, filed last week, involves homeowners in Broward and Lee counties who won judgments …
Citrus Canker Management for 2017
By Evan Johnson The citrus canker season is quickly approaching again, so it is time to start preparing your canker management plan. It is easy to forget the importance of controlling citrus canker with the current state of HLB in Florida. However, citrus canker can cause almost complete crop loss if environmental conditions are favorable for disease early in the …
Buddha’s Hand Citron Could Play Role in Canker Resistance Breeding
By Naveen Kumar, R.C. Ebel and P.D. Roberts Citrus canker became endemic in Florida after several introductions and eradication programs dating back to 1915. The citrus industry struggles for an effective, permanent program. Canker is an expensive disease due to the need to increase the number of sprays and products applied. Canker also causes enormous economic losses due to fruit …
Indian River Citrus Grower on Canker, HLB and Bactericides
Canker and HLB have made things very difficult for Indian River citrus growers, but outgoing Indian River Citrus League President Scott Lambeth is optimistic about bactericides. “For the last three years with the contraction of the industry, it’s very difficult to keep an open mind and stay positive when you see family farms that are third and fourth generation still …
Canker Is Manageable, Grower Crop Advisor Says
Tom Stopyra, technical crop advisor for the Packers of Indian River, told more than 75 growers at an Immokalee seminar last week how his company gets excellent canker management utilizing a four-pronged program: “You have to control the leafminer. You have to have frequent copper sprays at a lower rate. You have to have windbreaks and sanitation, which is the …
How to Factor the Freeze Into Spring Disease Management
By Megan Dewdney The recent freeze events of the last few weeks have scrambled the plans of citrus growers. It will take several weeks to months to understand the extent of the damage caused by the unusually cold weather. MELANOSE There is at least one disease that is highly likely to be worse than in other years. Melanose is likely …
Growers Can Stay Productive in the Face of HLB
Despite declaring there will be no silver bullet for HLB, Ozgur Batuman in a Jan. 21 virtual seminar said growers using integrated pest management (IPM) tools “can stay productive.” However, the University of Florida Institute of Food and Agricultural Sciences associate professor also warned that producing citrus juice in Florida “will not be easy or cheap.” Oranges are by far …
Amending Oxytetracycline With Ascorbic Acid
By Lauren Fessler Mathews, Ana Redondo and Ozgur Batuman Trunk injections of oxytetracycline (OTC) have been proven to give huanglongbing (HLB)-affected citrus in Florida a boost in productivity and quality. However, previous studies have shown that even just six hours of exposure to heat and humidity in the grove can lead to OTC injections that no longer adequately suppress CLas …
Pomelos From Vietnam Concern Citrus Australia
Citrus Australia has called on Australia’s minister for agriculture and the Department of Agriculture, Fisheries and Forestry to pause the market access application for pomelo from Vietnam. It cited biosecurity risks that require further scientific assessment. Citrus Australia Chief Executive Officer Nathan Hancock said Australia’s citrus industry strongly supports mutually beneficial trade and recognizes the importance of open, rules-based market …
Foreign Barriers to Florida Citrus
The Florida Fruit & Vegetable Association (FFVA) recently provided comments to the Office of the United States Trade Representative as part of the annual review of foreign barriers to U.S. exports and investment. The FFVA letter noted injury to Florida citrus caused by low-priced imports from Mexico and the European Union’s use of scientifically unjustified, non-tariff trade barriers. Letter excerpts …
Podcast Takes a Deep Dive Into CUPS
Citrus under protective screen (CUPS) continues to grow in popularity with about 1,500 acres now planted in Florida. The October All In For Citrus podcast covers CUPS and some of the challenges growers can face with the system. Jerry Mixon, a CUPS grower, discusses why he wanted to try the system and some of the challenges he has faced with …
All In For Citrus Podcast, October 2025
The October All In For Citrus podcast features citrus under protective screen (CUPS). Over the past decade, the practice has grown in popularity due to its ability to exclude the Asian citrus psyllid and huanglongbing (HLB) disease. Roughly 1,500 acres of citrus are grown under screen in Florida with more acreage under development. Lauren Diepenbrock, associate professor of entomology at …
Prolong Tree Health by Combining Covers and Brassinosteroids
As every Florida citrus grower knows, it has been difficult to grow trees and fruit profitably since huanglongbing (HLB) disease was discovered in the state in 2005. Soon after the disease was discovered, officials determined it couldn’t be eradicated largely because the Asian citrus psyllids (ACP) that spread it showed up years earlier and were in virtually all citrus-producing regions. …
Plant Diagnostic Facilities for Georgia Citrus Growers
The University of Georgia (UGA) has disease labs and clinics to help citrus producers determine what diseases are impacting their trees. Jonathan Oliver, UGA assistant professor and small fruits pathologist, highlights the diagnostic facilities that growers can take advantage of. “We have a lab in Tifton, the Plant Disease Clinic, that can accept samples from commercial citrus,” Oliver said. “We …
Brazil to Implement National Greening Prevention and Control Program
Brazilian agriculture officials recently visited Fundecitrus to discuss the first steps in implementing the National Greening Prevention and Control Program, which will be implemented by the states. The officials were with the Ministry of Agriculture, Livestock and Food Supply (MAPA) and the Agricultural Defense Coordination Office of the State of São Paulo. The ordinance establishing the National Greening Prevention and …




























