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Below you'll see everything we could locate for your search of “fungicides”
One of the most damaging pathogens for citrus crops continues to be Phytophthora, a soilborne pathogen that attacks the root systems and affects the entire citrus tree. As the pathogen degrades the tree’s root system, above ground symptoms such as slowed growth, chlorotic foliage and reduced fruit size intensify. Eventually, this may result in the death of the tree. Phytophthora can appear …
One of the most damaging pathogens for citrus crops continues to be Phytophthora, a soilborne pathogen that attacks the root systems and affects the entire citrus tree. As the pathogen degrades the tree’s root system, above ground symptoms such as slowed growth, chlorotic foliage and reduced fruit size intensify. Eventually, this may result in the death of the tree. Phytophthora can appear …
By Megan Dewdney and Evan Johnson In 2019, the trend of fewer problems with foliar fungal diseases for Florida citrus continued, which was good news for the industry. Despite the El Niño conditions during the spring, little postbloom fruit drop (PFD) was observed because the temperatures were low (< 75 F) when it rained during bloom. The southern parts of …
The Florida Fertilizer and Agrichemical Association (FFAA) is taking a new approach to educating consumers about the benefits and need for pesticides. FFAA President Mary Hartney, who describes herself as “an advocate for the responsible use of pesticides and fertilizers in Florida,” discussed the approach at Florida Ag Expo in November. Hartney says many people are opposed to all forms …
Mark Ritenour with the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) reports on evaluations of new fresh mandarin and sweet orange selections. Ritenour is a professor at the Indian River Research and Education Center in Fort Pierce. Ritenour lists four mandarin varieties that had “100 percent healthy fruit” after six or seven weeks in storage, even without being …
Quality and shelf life were evaluated for new fresh mandarin and sweet orange selections. By Mark A. Ritenour, Cuifeng Hu, Yu Wang and Fernando Alferez New fresh citrus fruit selections continue to be developed and released by the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) and the U.S. Department of Agriculture. In addition, promising new varieties are …
The three editors of the new Florida Citrus Production Guide recently told growers at a meeting in Sebring what’s new in the guide this year. The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) produced the guide. Megan Dewdney, a UF/IFAS plant pathologist, addresses new information provided about diseases. New items include the addition of a chemical for …
Horticulturist Tripti Vashisth discussed the use of gibberellic acid (GA) in HLB-affected trees at a recent, well-attended OJ Break in Bartow hosted by multi-county citrus Extension agent Chris Oswalt. Vashisth is an assistant professor at the University of Florida Institute of Food and Agricultural Sciences Citrus Research and Education Center. Vashisth told growers that HLB-affected trees are under continuous stress …
By Tripti Vashisth, Garima Singh and Megan Dewdney Citrus trees grown in the field undergo various types and levels of stress continuously. The stressors can be several things, including heat, cold, drought, soil pH, chemicals, pests and diseases. The constant presence of huanglongbing (HLB) and psyllid infestation adds stress to the trees, which compromises the plant response and makes the …
By Lukasz L. Stelinski, Jawwad A. Qureshi and L. Gene Albrigo Florida citrus production has a long and trailblazing history of implementing integrated pest management (IPM). In 1950, the director of the Florida Citrus Experiment Station, A.F. Camp, proposed an “Ecological Survey of Citrus Pests and Disorders” to provide a comprehensive survey of the ecology of citrus groves throughout Florida …
By Evan Johnson Diseases caused by phytophthora continually threaten Florida citrus production. Brown rot can directly reduce yields of early maturing varieties including Hamlin and grapefruit, can delay harvest of fresh market fruit until infected fruit have dropped, or risk packinghouse rejection of the load because it can spread post-harvest. Foot and crown rot can kill trees but are uncommon …
By Brenda Eubanks Burnette The headline of a Wilson & Toomer Fertilizer Company advertisement in a 1949 Citrus Industry magazine read “how to think UPSIDE DOWN — and make more money!” It included the following copy: “If a tree can be said to think at all — it thinks from the bottom up — just opposite to Man. To make …
By Megan Dewdney The Florida citrus-growing seasons of 2017 and 2018 were quiet in terms of fungal foliar disease outbreaks. Small pockets of severe disease occurred sporadically, but there were no widespread reports of diseases like postbloom fruit drop, much to the relief of the industry. Greasy spot has flared up in a few locations on cultivars like Valencia, and …
What is a pesticide, really? By Laurie A. Hurner Editor’s note: This article grants one continuing education unit (CEU) in the Core category toward the renewal of a Florida Department of Agriculture and Consumer Services restricted-use pesticide license when the accompanying test is submitted and approved. There is a lot of confusion about the term “pesticide” when you talk to …
By Brenda Eubanks Burnette Editor’s note: Citrus Industry is pleased to welcome back Pieces of the Past to the pages of the magazine after publishing it on CitrusIndustry.net for the past year. This popular citrus history column returns to the magazine in preparation for Citrus Industry magazine’s 100th anniversary in January 2020. Leading up to the anniversary, each Pieces of …
“Postbloom fruit drop (PFD) season is coming upon us fairly quickly,” plant pathologist Megan Dewdney said in summarizing a presentation she made Jan. 16 in Immokalee, Florida. “Growers should be planning on keeping an eye on the rain forecast … how much bloom they are having now, how much bloom they’ll have in two (to) three weeks, and keeping an …
By Arnold Schumann, Timothy Ebert, Laura Waldo, Danny Holmes, Napoleon Mariner, Gary Test, Chris Oswalt, Rhuanito Ferrarezi and Ricardo Lesmes Two studies with citrus under protective screen (CUPS) were established at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center (CREC) and Indian River Research and Education Center (IRREC) in 2013–14. The goal …
A new University of Florida-developed forecasting system could help citrus growers control postbloom fruit drop this winter, despite the predicted El Niño weather pattern that’s expected to bring more rain and moderate temperatures. With an El Niño, forecasters expect above-average rain this winter and early spring. Increased rain improves the chances of fungal spores splashing from flower to flower in …
At Citrus Expo, University of Florida soil scientist Kelly Morgan said nutrient uptake by HLB-infected trees can be improved by applying the proper amount of nutrition and managing pH. “Those two things go hand-in-hand,” he said. “As you reduce soil pH below 7, you increase the uptake of most nutrients. So we need to reduce our pH. Our pH has …
By Megan M. Dewdney, Tripti Vashisth and Ariel Singerman In 2017, the damage from postbloom fruit drop (PFD) was lower than the previous three years. This was mainly due to the low rainfall accumulation in late winter and early spring. The long bloom with relatively few flowers at any one time made the decision of when to apply a fungicide …
