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Below you'll find a list of all posts that have been categorized as “Diseases”
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 …
Federal and Texas agriculture officials announced on April 26 they were establishing four new quarantined areas for citrus canker in Hidalgo County and expanding one existing canker quarantined area in Cameron County. The actions by the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (USDA APHIS) and the Texas Department of Agriculture (TDA) were taken to prevent …
Fundecitrus researchers Renato Bassanezi and Silvio Lopes in April addressed the citrus greening situation in Brazil from an epidemiological point of view during the International Epidemiology Workshop held in Brazil. Lopes presented work on the potential of citrus plants in backyards being a source of Candidatus Liberibacter asiaticus (the bacterium associated with greening) inoculum for commercial orchards. Fundecitrus has been …
While the recent Florida Citrus Growers’ Institute presentations focused mainly on HLB, other topics were addressed, including phytophthora root rot. This disease has become more problematic in recent years. Megan Dewdney, University of Florida Institute of Food and Agricultural Sciences associate professor of plant pathology, spoke on the topic. She noted that phytophthora already is a complex problem and that …
Several factors can influence the period of citrus leprosis control after acaricide applications, according to a study by Daniel Andrade, a professor and researcher from São Paulo State University in Brazil. The research aimed to better understand how these factors can affect and increase the leprosis control period. “We studied acaricides, the moment of application of the acaricide, the presence …
Federal and Texas agriculture officials announced they are establishing four new quarantine areas for citrus canker in Brazoria and Harris counties, Texas. They are also expanding three existing quarantine areas for citrus canker in Brazoria, Fort Bend, Galveston and Harris counties. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) and the Texas Department of Agriculture …
Federal agriculture officials, in cooperation with Louisiana agriculture officials, have established a federal quarantine area for huanglongbing (HLB; citrus greening), caused by Candidatus Liberibacter asiaticus, in all of Saint Charles Parish in Louisiana. The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (USDA APHIS) took the action in cooperation with the Louisiana Department of Agriculture and Forestry (LDAF). …
Positive identifications of citrus yellow vein clearing virus (CYVCV) have been found in the Hacienda Heights area of Los Angeles County. The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service confirmed the identifications during the California Department of Food and Agriculture’s (CDFA) routine multi-pest survey. This is the second area in California where CYVCV has been detected. The …
