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Below you'll find a list of all posts that have been categorized as “Tip of the Week”
By Megan Dewdney It was a difficult winter for many citrus trees in Florida, with freeze damage and very dry weather stressing them. Trees will be flushing as much as they can to replace the damaged canopy lost over the winter. This means they will be drawing strongly on the bank of carbohydrates in the roots. The spring 2026 root …
By Tripti Vashisth, Abhishek Neupane and Taylor Livingston Florida citrus trees are under pressure from huanglongbing (HLB). The disease weakens root systems, reducing the tree’s ability to take up water and nutrients. Compounding this issue, most Florida groves sit on sandy soils with very little organic matter. These soils drain quickly, struggle to hold nutrients and allow both water and …
By Matt Smith The pesticide label is going online — kind of. I’ll explain, but the main takeaway is that a new step before spraying is required from now on. It’s not particularly difficult, but it is going to add to your pre-spray paperwork and planning. Why is this happening? After multiple lawsuits, judges reaffirmed that the Federal Insecticide, Fungicide, …
This winter’s hard freeze may have knocked back visible Asian citrus psyllid (ACP) activity, but research shows the pest is not reliably eliminated by the cold. In lab studies, many ACP adults and nymphs survived several hours at 21 to 23 degrees, and eggs could still hatch after several hours at temperatures as low as 8 degrees. Adults can also …
By Lauren M. Diepenbrock Many citrus growers in Florida have been impacted by Bulimulus bonariensis (previously referred to as Bulimulus sporadicus) since the first reports of this pest in groves in 2020. This snail is an ongoing challenge and, with funding from the Citrus Research and Development Foundation, the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) has …
By Megan Dewdney The recent freeze events of the last few weeks have scrambled the plans of citrus growers. It will take several weeks to months to understand the extent of the damage caused by the unusually cold weather. MELANOSE There is at least one disease that is highly likely to be worse than in other years. Melanose is likely …
By Muhammad A. Shahid and Davie Kadyampakeni Silicon (Si) is getting a lot of attention from citrus growers as a tool to help trees handle stress, especially during cold and freeze conditions. It toughens up plant tissues, strengthens cell walls and helps trees better handle stress when it is applied at the right time. BEFORE FREEZE The most important thing …
By Davie Kadyampakeni, Alisheikh Atta and Edilaine Traspadini Citrus trees require optimal nutrition to be able to maintain high fruit yields, canopy size and good root health. Adequate nutrition supports not only yield and growth, but also tree resilience to disease and environmental stress, which is particularly important in HLB-affected groves. A balanced mix of macronutrients and micronutrients is needed …
By Lauren Fessler Mathews, Ana Redondo and Ozgur Batuman Trunk injections of oxytetracycline (OTC) have been proven to give huanglongbing (HLB)-affected citrus in Florida a boost in productivity and quality. However, previous studies have shown that even just six hours of exposure to heat and humidity in the grove can lead to OTC injections that no longer adequately suppress CLas …
By Fernando Alferez, Divya Aryal and Saoussen Ben Abdallah University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) research in the last three years has found that the combined use of individual protective covers (IPCs) and brassinosteroids (BRs) enhances protection of citrus trees against HLB and other diseases that limit citrus production in Florida. The research has been conducted …
By Lauren Diepenbrock Pest management is a year-round challenge in Florida citrus. But with knowledge of insect, mite and snail seasonal biology in relation to tree phenology, plans can be developed to protect fruit and maintain productive citrus trees. Populations of some highly problematic pests (Asian citrus psyllid and citrus leafminer) generally increase with flush/new growth development, so targeting peak …
By Taylor O’Bannon, William Mitchell, Morgan Madison, Stephanie Brown, Keith Schneider and Michelle Danyluk The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Produce Safety Extension Team compiled a wish list of food-safety items for citrus growers to prepare for the new year. Some of these items are must-haves straight from the Food and Drug Administration’s Food Safety …
By Ramdas Kanissery Young citrus trees are highly sensitive to herbicides. Even small amounts of drift onto green bark or foliage can significantly impact tree growth (Figure 1). Taking a few practical precautions during herbicide applications can help protect young trees and keep them growing strong during their early establishment years. AVOID HERBICIDE CONTACT WITH GREEN BARK The greatest risk …
By Jawwad A. Qureshi In winter, citrus trees enter a state of quiescence due to lower light and cooler temperatures, which slows their metabolic activity. Therefore, most citrus trees do not produce new shoots during this period. These young shoots are essential for the growth of the Asian citrus psyllid (ACP), Diaphorina citri. The ACP is a small sap-feeding insect …
By Davie Kadyampakeni, Chris Oswalt and Muhammad A. Shahid With the onset of cooler temperatures, citrus trees cease active growth and become quiescent. This continued quiescence at lower temperatures results in a subsequent increase in cold hardiness, known as acclimation. Citrus trees proceed through many changes during acclimation, including: The above factors combine to increase the ability of citrus tissues …
By Muhammad A. Shahid, Shahid Iqbal and Davie Kadyampakeni As temperatures begin to drop across citrus-growing regions, now is the time for growers to prepare their groves for potential freeze events. Citrus trees, especially young plantings, are susceptible to cold temperatures. Damage from a single freeze event can result in canopy dieback, fruit loss and even tree death. Proper planning …
By Edwin Gutierrez-Rodriguez and Bosques Jonael Replanting a citrus grove can be an exciting prospect, but it’s not as simple as swapping trees. New cultivars, for example, may require a different setup. Here are some aspects to consider before jumping in: First steps: Newly released cultivars and rootstocks as wells as the Citrus Research and Field Trial programs are refreshing the …
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 …
By Fernando Alferez and Divya Aryal Brassinosteroids (BRs) are a class of plant growth regulators with several effects on plant growth and development. They engage in crosstalk with other hormones like auxin, gibberellins, ethylene and abscisic acid, influencing all plant growth and development aspects including fruit maturation, but the timing of this effect appears to be short and tightly regulated. …
By Ramdas Kanissery Even a small amount of leftover herbicide in the spray tank can harm citrus trees. Contamination often occurs when the same sprayer is used on trees of different ages without being cleaned properly between applications. It can also happen when the sprayer is used for other pesticide products without a thorough rinse. Herbicide residues from certain herbicide …
