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By Evan Johnson Now that bloom has arrived, it is time to start thinking about canker management. As the fruitlets develop, they will become susceptible around the end of March to the beginning of April. The spring fruit lesions are particularly concerning because they cause fruit drop. Without proper management, early season canker can cause 90 to 100% crop loss …
An important bacterial disease that affects citrus trees and causes lesions, citrus canker has been effectively controlled by spraying copper. However, standard management techniques involve spraying excessive amounts of copper and water without consideration for the size of the trees. “This technique resulted in a waste of resources as well as higher costs, detrimental environmental impact and risk for development …
Approximately 12,000 Lee County homeowners in Florida will receive checks in early January as compensation for citrus trees destroyed in the state’s citrus canker eradication program, according to attorney Robert Gilbert. Gilbert was the lead counsel representing the homeowners in a class action lawsuit for the past 17 years. According to Gilbert, the residential trees that were destroyed by the …
The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) announced June 30 it was immediately expanding the area quarantined for citrus canker in Texas. The agency added portions of Cameron County near San Benito and Brownsville to prevent the spread of the disease. APHIS confirmed the positive identification of citrus canker in two residential trees in San …
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 …
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 …
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, …
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 …
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 …
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 …
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 …
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 …
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 …
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 …
Despite a slowdown in Brazil’s citrus greening incidence growth rate in 2026, the severity of the disease continues to climb in trees remaining in the field, according to Fundecitrus’ annual citrus disease survey. Average severity rose from 22.7% to 27% across orchards of all ages, and from 25.9% to 31% when considering only orchards currently in production. The survey also …
Fundecitrus’ first re-estimate of the 2026–27 orange crop for Brazil’s São Paulo and Triângulo/Southwest Minas Gerais regions, released Sept. 10, indicates production of 263.15 million 40.8-kilogram boxes. That’s an increase of 7.95 million boxes, or 3.1%, from the initial estimate released in May. The revision stems from an upward adjustment in projected fruit weight for early- and mid-season varieties, which …
Fungal foliar diseases significantly threaten commercial citrus production by reducing fruit packout and overall crop yield. Tangerines and mandarins are highly susceptible to these pathogens, particularly Alternaria brown spot and citrus scab. In a presentation at the recent Citrus & Specialty Crop Expo, Megan Dewdney, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) plant pathologist, outlined proactive management …
By Lauren Fessler Mathews, Ana Redondo and Ozgur Batuman The positive impact of oxytetracycline (OTC) trunk injections for citrus production in HLB-infected trees has been well established. Additionally, there has been extensive work showing that plant defense inducers (PDIs) can help boost tree health and reduce symptom development from a variety of pathogens. Based on this, University of Florida Institute …
Although huanglongbing (HLB) disease was highlighted in the citrus section of the U.S. Department of Agriculture Animal and Plant Health Inspection Service’s (USDA APHIS) recent PPQ (Plant Protection and Quarantine) 2025 Annual Report, the report also noted efforts against other citrus diseases. Those diseases include citrus canker, citrus yellow vein clearing virus, sweet orange scab and citrus black spot. The …
A recent University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) article addressed the use of plant defense inducers (PDIs) as sustainable alternatives to oxytetracycline (OTC) injection for HLB management. Researchers Lauren Fessler Mathews, Ana Redondo and Ozgur Batuman at the Southwest Florida Research and Education Center (SWFREC) authored the article. Slightly edited excerpts of the article follow: PDIs …
