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Below you'll see everything we could locate for your search of “gibberellic acid ”
University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) citrus scientists Tripti Vashisth and Fernando Alferez are trying to reduce the amount of fruit drop from Hamlin and Valencia trees prior to harvest. If fruit drops, growers can’t harvest it, and that leads to losses for farmers and less fruit at the market for consumers. Normally, about 10 to …
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 …
The August issue of Citrus Industry magazine has everything you need to make the most of your time at Citrus Expo. The complete guide to the event includes a seminar schedule, exhibitor directory, details about the new hands-on citrus session and more. The Vegetable and Specialty Crop Expo is once again being held jointly with Citrus Expo. The general session …
University of California Riverside Extension subtropical horticulturist Mary Lu Arpaia recently discussed the uses of the plant growth regulators 2,4-D, NAA and ethylene in California citrus. Her June 9 presentation was part of the Citrus Research Board Webinar Series. 2,4-D One use of 2,4-D in California is to increase fruit size of navel oranges, grapefruit, mandarins and mandarin hybrids. For …
By Tripti Vashisth, Taylor Livingston, Meryam Manzoor and Johann Hiller Citrus fruit quality and yield remain major concerns for sweet orange growers in the huanglongbing (HLB) era. These outcomes largely depend on the tree’s ability to support developing fruit throughout the growing season. Leaf area and canopy density are positively correlated with carbohydrate production and allocation to fruit, directly influencing …
By Tripti Vashisth and Prudhvi Vulchi Plant growth regulators (PGRs) have become an important management tool for Florida citrus growers facing the challenges of huanglongbing (HLB). HLB disrupts the tree’s hormonal balance by reducing growth-promoting hormones like cytokinin and gibberellins and increasing stress-related hormones. This imbalance weakens carbohydrate transport, reduces sink strength and accelerates canopy decline. PGRs can help restore …
The 2025–26 State of the Citrus Industry Survey asked growers if they are planting and what their variety and rootstock selections are. It also surveyed growers on their sentiments about the future of citrus in Florida. Following are some highlights from the survey which was conducted in the fall of 2025. (See Part 1 of survey results here). Growers’ preference …
By Taylor Livingston and Tripti Vashisth Preharvest fruit drop is a major concern for Florida citrus growers, especially in groves affected by huanglongbing (HLB). Environmental stressors such as drought, flooding and cold snaps further accelerate fruit drop and tree decline. Recent field trials in Central Florida evaluated the use of plant growth regulators (PGRs) — specifically gibberellic acid (GA3) and …
The strategies to control the Asian citrus psyllid (ACP) in Florida have evolved over the years. Some practices have come and gone, but one point remains — ACP control is essential. That was the message Lukasz Stelinski made during the June episode of the All In For Citrus podcast. Stelinski, an entomologist with the University of Florida Institute of Food …
By Tripti Vashisth University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) flower bud induction advisories for 2024–25 started on Nov. 25. The advisories will be posted bi-weekly until March 2025. The goal of the advisories is to provide growers and production managers with a complete overview of flowering prediction. Every advisory will aim to deliver recommendations for that …
Despite low production levels this season in Florida, grower success stories can still be seen in citrus. Wm. G. Roe & Sons is a prime example. The August issue of Citrus Industry magazine tells how the century-old citrus business is still flourishing. As the next generation of leadership steps up in the Roe family, the business is also implementing a …
Since its founding in 2019, the Citrus Research and Field Trial (CRAFT) program has been responsible for the planting of just under 10,000 acres of new trees. This includes about 6,000 acres of solid-set groves and just shy of 4,000 acres of resets. CRAFT is a first-of-its-kind program and considered an innovation among funding agencies needed to support such efforts. …
By Tripti Vashisth Florida flower bud induction advisories for the upcoming season start on Nov. 15. These advisories will be published biweekly until March 30, 2024. The goals of flower bud advisories are to inform growers about the status of the tree in respect to floral bud induction and to predict bloom. This is critical information since the horticultural practices …
By Michael Rogers Much has been discussed recently about the promise and potential of utilizing CRISPR technology to create HLB-resistant trees for Florida’s citrus growers. The primary objective in citrus gene editing is to develop new varieties that are resistant to HLB disease while remaining non-transgenic. To achieve this goal, researchers make alterations to or eliminate specific genes within the …
By Frank Giles and Tacy Callies The Citrus & Specialty Crop Expo hosted two citrus educational sessions during the Aug. 16–17 event held at the Florida State Fairgrounds in Tampa. The sessions included both long-term research aimed at delivering trees resistant to HLB as well as what growers can do today to help mitigate the effects of the disease in …
The Citrus Research and Development Foundation (CRDF) recently issued a report describing some of its projects testing the injection of oxytetracycline (OTC) into trees as an HLB treatment. 1. Lukasz Stelinski and Kirsten Pelz-Stelinski, both of the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS), are measuring the impact of OTC injection on the Asian citrus psyllid (ACP) …
The 2023–2024 Citrus Production Guide will be available to growers at the Citrus & Specialty Crop Expo in Tampa on Aug. 16–17. The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) publication includes the latest technical advice on HLB management, tree nutrition, grove management and other aspects of Florida citrus cultivation. The guide is a comprehensive reference meant …
The Citrus Research and Field Trial (CRAFT) Foundation has reopened the application window for its Existing Tree Therapies Program. Applications will be accepted until 5 p.m. on Aug. 31. Participants will be selected through a random lottery, administered by a third-party entity. The program is designed to provide the industry with a better understanding of the best use patterns, combinations …
During the Florida Citrus Industry Annual Conference earlier this month, Tamara Wood, executive director of the Citrus Research and Field Trial (CRAFT) Foundation, gave an update on a new phase of the CRAFT program. Started in 2019, CRAFT was initially focused on new plantings. The program helps growers cover the cost of new plantings if they agree to an experimental …
The Citrus Research and Field Trial (CRAFT) Foundation received nearly 700 eligible applications — representing more than 42,000 acres — for its new Existing Tree Therapies Program. A random lottery drawing was recently conducted by a third party, and 159 projects have been selected for inclusion in the program. The remaining applications have been placed on a waitlist. CRAFT staff …
