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Below you'll find a list of all posts that have been categorized as “Diseases”
Federal and state agriculture officials have expanded the quarantine for citrus greening in the Perris area of Riverside County in California by 33 square miles. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) in cooperation with the California Department of Food and Agriculture (CDFA) expanded the quarantine. The measure parallels the intrastate quarantine that CDFA established …
An Iranian study in controlled greenhouse conditions has enhanced the understanding of the influence of rootstocks on limes infected with witches’ broom disease of lime (WBDL). The study has also led to the acknowledgement that WBDL management may require tolerance of both scions and rootstocks. Authors of an article about the study are Samaneh Raheb, Sina Noorizadeh and Morteza Golmohammadi, …
Citrus greening disease has yet to find its footing in Georgia. But that doesn’t mean it can’t or won’t eventually. Mary Sutton, University of Georgia assistant professor and citrus Extension specialist, discussed the ramifications of citrus greening during the recent Southeast Citrus Update in Lyons, Georgia. “If we get greening established here, we’ll start seeing lower and lower production on …
Georgia citrus growers are still in the honeymoon phase of production with regards to disease, said Jonathan Oliver, University of Georgia (UGA) assistant professor and small fruits pathologist. While established groves in Florida have had to deal with disease buildup for decades, disease has yet to be problematic for South Georgia citrus production. But that could be changing. “With respect …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (APHIS) announced June 26 that it was establishing and expanding the quarantined areas for citrus canker in Texas to prevent the spread of the disease. The action was taken in cooperation with the Texas Department of Agriculture (TDA). APHIS established a new quarantined area in the Harlingen Area of …
By Megan Dewdney The Florida rains have finally come this summer, just in time for early-season fruit to start the maturation process. This means there is some risk of brown rot in early sweet oranges and grapefruit. Much of Florida has been getting summer storms, wetting the soil. While this is excellent in general, the downside is that it allows …
Citrus black spot (CBS) quarantines have been established for the first time in Florida’s DeSoto and Highlands counties. In addition, sections of other counties have been added to the existing CBS quarantine in Florida. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA/APHIS) in cooperation with the Florida Department of Agriculture and Consumer Services Division of Plant …
A new quarantine area for sweet orange scab (SOS) was recently established in the Burbank area of California’s Los Angeles County. The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA/APHIS) in cooperation with the California Department of Food and Agriculture announced the quarantine area. The 91-square-mile quarantine was established because of an SOS detection in a plant …
With support from the São Paulo Research Foundation (FAPESP), Ideelab is developing more efficient strategies to combat pathogens that threaten citrus. The work of Ideelab, a São Paulo startup company, is based on the principle that plants communicate with microorganisms through specific molecules called effectors. Effectors are peptides and proteins that are produced naturally and interact with the pattern recognition …
Recent rainfall has been a welcome sight for Floridians, but it can be a concern for the state’s citrus growers who are producing next year’s crop. Chris Oswalt, University of Florida Institute of Food and Agricultural Sciences citrus agent, cautions growers about citrus canker amid the increased moisture in the region. “With rainfall, you need to be concerned about those …
As the rainy season in Florida is set to begin, we caught up with Megan Dewdney to discuss citrus canker and other disease issues. Dewdney is a plant pathologist with the University of Florida Institute of Food and Agricultural Sciences. Q: How has the prevalence of citrus canker been in Florida in the past year or so? A: Dewdney: Citrus …
By Megan Dewdney Every summer, a low rumble about algal spot reaches my ears. And every year, someone discovers it in their Florida grove for the first time. While this is a disease that is not always at the top of mind for growers, when you see it for the first time, it can be dramatic. DISEASE SYMPTOMS Algal spot …
Three citrus grower associations applauded Chairman GT Thompson and the U.S. House Agriculture Committee for including critical funding for the Emergency Citrus Disease Research and Extension Program in the recent budget reconciliation draft. The associations were California Citrus Mutual (CCM), Florida Citrus Mutual (FCM) and Texas Citrus Mutual (TCM). The investment represents a vital commitment to the long-term health and …
The disease branch rot is worrying Brazilian citrus growers because of its recent increased occurrence in orchards. Branch rot is also called peduncular rot, branch gummosis or bot gummosis. The main reason for the disease’s occurrence is stress caused to citrus plants by high temperatures, severe periods of drought and attacks from other diseases, such as greening. Fungi of the …
By Megan Dewdney Citrus canker can contribute significantly to the loss of fruit prior to harvest. As bloom begins in Florida, it is time to finalize management plans for foliar diseases. For many growers, very aggressive canker management programs are no longer a possibility, however, some management is important. Citrus canker susceptibility of young fruitlets usually starts at the end …
A tool predicting how to protect European citrus from HLB shows how mathematical modeling can help prepare for future plant disease invasions. Europe is currently unaffected by HLB. However, there are increased concerns of an infestation since psyllids that spread HLB have been found in key citrus-producing countries, including Portugal and Spain. In response to the HLB threat, a new …
By Megan Dewdney Despite being in a transition from a La Niña to a neutral El Niño Southern Oscillation phase, Florida has not had warmer than average temperatures in the last two weeks from March 3. Looking at historical trends, temperatures for the last two weeks of February were in the normal range for this time of year. When looking …
By Megan Dewdney As I write this article in January 2025, the world is a chilly place, and it is hard to imagine warm and wet weather in Florida. The predicted weather pattern from now until flowering is moving from La Niña toward neutral. This is predicted to bring above-average spring temperatures with reduced rainfall. This is a hopeful sign …
HLB was recently confirmed for the first time in Arizona, first in an Asian citrus psyllid (ACP) and then in another ACP and citrus plant tissue. The Arizona Department of Agriculture (AZDA) reported the details. On Dec. 16, 2024, agriculture inspectors collected ACP and plant tissue samples from a residential citrus tree in Nogales. The collections were made during a …
The U.S. Department of Agriculture Animal and Plant Health Inspection Service (USDA/APHIS) recently announced a quarantine for huanglongbing (HLB) in Mississippi as well as updates to Mexican fruit fly (Mexfly) quarantines in Texas. HLB APHIS, in cooperation with the Mississippi Department of Agriculture and Commerce, established a quarantine for the entire state of Mississippi for HLB. The action was taken …
