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Below you'll find a list of all posts that have been categorized as “Diseases”
Phytophthora, citrus black spot and HLB are among diseases that could be spread in Florida groves as a direct or indirect result of Hurricane Milton, researcher Megan Dewdney cautioned. Dewdney, a University of Florida Institute of Food and Agricultural Sciences associate professor of plant pathology, offered suggestions for dealing with those diseases during a recent hurricane recovery webinar. PHYTOPHTHORA Phytophthora …
By Ariel Singerman Orange yield in Florida has decreased by more than 80% since HLB was first found in the state in 2005. It is hard to find another example in recent history of an industry as iconic as Florida citrus that has declined so significantly as a consequence of a plant disease. As a comparison, at the global level, …
The area quarantined for HLB in San Diego County, California, has been expanded, the U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) announced on Sept. 23. USDA APHIS took the action in cooperation with the California Department of Food and Agriculture (CDFA). HLB, a plant disease caused by Candidatus Liberibacter asiaticus, is also known as citrus …
Citrus growers impacted by Hurricane Helene now must decide the best management strategy to protect trees from potential disease issues prior to harvest. Kim Jones, a citrus grower and packer with operations in Monticello, Florida, and Tifton, Georgia, weighed in on what to consider to protect trees. “Fungus is the biggest risk at this point,” said Jones. “The sunshine is …
The Citrus Research and Development Foundation (CRDF) board of directors had a busy meeting in September. The board approved several research proposals for funding. And one researcher was asked to revise and resubmit a proposal. “A complicating factor was several of the proposals were put together before the ‘off-year’ of oxytetracycline (OTC) usage was repealed, but we concluded that it …
By Megan Dewdney It is late summer or early fall, and the usual time to consider brown rot treatment options has passed. However, you smell a sharp fermented fruit odor. When you look closer, fruit have the telltale soft brown lesions of brown rot. What options exist to minimize losses now? It is too late for the traditional control options …
U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA/APHIS) officials, in cooperation with the California Department of Food and Agriculture (CDFA), recently expanded the areas quarantined for huanglongbing (HLB) and sweet orange scab (SOS) in the state. HLB The quarantined area in Los Angeles, Orange and Riverside counties has been expanded by approximately 50 square miles. Additionally, the …
University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) presenters on Aug. 30 discussed symptoms and management of the fungal citrus diseases brown rot and greasy spot. Plant pathologist and associate professor Megan Dewdney, the featured speaker, focused on management. Multi-county citrus Extension agent Mongi Zekri, who hosted Dewdney’s talk, described disease symptoms. BROWN ROT Brown rot is usually …
Brazil’s Fundecitrus recently issued an alert about the risk of citrus floral rot during the current citrus flowering period. Citrus flowering periods must be on growers’ radar to avoid damage to orchards caused by citrus floral rot, also known as starlet. Attention must be doubled, especially if the flowering coincides with rainy periods, a determining factor in the occurrence of …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA/APHIS) recently revised sweet orange scab (SOS) requirements. APHIS revised the conditions for the interstate movement of citrus nursery stock (CNS) and updated the inspection requirements for CNS to be eligible for shipment. The federal order also updates the APHIS-Approved Packinghouse Procedures for Elsinoë australis, Causal Agent of Sweet …
Algal spot, not frequently seen in Florida citrus groves before 2015, has become more severe in recent years, University of Florida Institute of Food and Agricultural Sciences speakers reported Aug. 30. And the disease is likely to intensify as a problem with average temperatures increasing, said Megan Dewdney, associate professor of plant pathology at the Citrus Research and Education Center …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) recently modified the policies and requirements for the citrus black spot (CBS) quarantine area in Florida. Modifications address the movement of regulated articles and provide a protocol to remove areas from the CBS quarantine. This federal order updates the APHIS-Approved Packinghouse Procedures for Phyllosticta citricarpa, Causal Agent …
Citrus black spot (CBS) is a constant concern for producers in northern Argentina, causing premature fall of affected fruit and aesthetic damage that reduces commercial value. Researchers at the National Agricultural Technology Institute in Yuto, Argentina (INTA Yuto) are working on rapid detection of the disease. Their work is based on a protocol that focuses on the location of the …
By Chris Oswalt During this time of the year, Florida growers should be aware of the potential for the development of citrus brown rot disease. It can infect fruit at color break. If severe, the disease can cause a significant amount of infected fruit to drop. For this reason, groves with a history of brown rot in areas that recently …
Phytophthora incidences are increasing in Florida citrus groves, plant pathologist Ozgur Batuman reported during a May 21 presentation. Phytophthora diseases include foot rot of trunk and limbs, root rot and brown rot. Batuman, a University of Florida Institute of Food and Agricultural Sciences associate professor, said these diseases led to yield reductions of 3% to 6% per year even prior …
The conditions for the interstate movement of citrus nursery stock and packinghouse procedures for citrus fruit from sweet orange scab (SOS) quarantined areas in California were recently revised. The actions were taken by the U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS). The actions update the “APHIS-Approved Packing House Procedures for Elsinoë australis, Causal Agent of …
Plant pathologist Ozgur Batuman recently warned that two citrus viral diseases not currently in Florida are highly suited to the state’s climate and would likely impact production if found there. They are citrus leprosis and citrus yellow vein clearing virus (CYVCV). Batuman, a University of Florida Institute of Food and Agricultural Sciences associate professor at the Southwest Florida Research and …
Agriculture officials have expanded the areas quarantined for citrus greening (huanglongbing; HLB), caused by Candidatus Liberibacter asiaticus, in Texas. All of Zapata County has been added to the quarantined areas. The action was taken by the U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) in cooperation with the Texas Department of Agriculture (TDA). The action was taken …
Agriculture officials have increased the existing citrus black spot (CBS) quarantine area in Florida and established a new quarantine area. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) and the Florida Department of Agriculture and Consumer Services Division of Plant Industry (FDACS DPI) took these actions. CBS is a fungal disease that leaves fruit speckled …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA/APHIS) is expanding the quarantine area in California for Elsinoë australis, the fungal causal agent of sweet orange scab (SOS). The expansion aligns with the state interior quarantine that the California Department of Agriculture (CDFA) implemented Oct. 1, 2023. SOS infection causes scab pustules that give fruit a corky …
