Antibiotics, HLB and Psyllids

Josh McGillHLB Management, Pests

Entomologist Kirsten Pelz-Stelinski recently shared findings from trials on the use of foliar-applied and trunk-injected antibiotics for controlling HLB and the Asian citrus psyllids (ACP) that spread the disease. Pelz-Stelinski is associate center director at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Citrus Research and Education Center (CREC) in Lake Alfred.  In a May 17 presentation …

Can Brassinosteroids Help Citrus Cope With Disease and Extreme Weather?

Josh McGillDiseases, Research, Weather

By Fernando Alferez and Muhammad A. Shahid Brassinosteroids (BRs) are a natural group of hormones that regulate physiological and biochemical attributes that include seed germination, flower development, root formation and resistance to various abiotic and biotic stresses. BRs have shown promise in reducing pests and diseases in a wide range of plants, including citrus. A commercial formulation of BRs has …

Pest Management Findings Shared

Josh McGillCUPS, IPCs, Pests

Foliar sprays of insecticides timed to citrus flushing provided a significant reduction in Asian citrus psyllid (ACP) populations compared to standard grower practices, researcher Jawwad Qureshi reported. Timing sprays to flushing also led to a reduction in sprays, the University of Florida Institute of Food and Agricultural Sciences associate professor of entomology said in a virtual presentation on Feb. 22. …

Bugs Under the Covers

Josh McGillIPCs, Pest Management

Individual protective covers (IPCs) do an excellent job keeping HLB-spreading Asian citrus psyllids (ACP) out of young citrus trees, showing a 99.6% reduction in ACP compared to control trees. But they don’t provide “one and done” pest control, according to University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) entomologist Lauren Diepenbrock. In fact, IPCs “create a perfect environment …

post-hurricane

Controlling Pest Pressure Post-Hurricane

Josh McGillhurricane, Pests

University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) multi-county citrus Extension agent Ajia Paolillo summarized suggestions for controlling pest pressure after Hurricane Ian in a recent Extension newsletter. Along with horticultural practices and disease control, growers should be monitoring for pests in their groves post-hurricane. UF/IFAS entomologist Lauren Diepenbrock provided some suggested practices for keeping pest pressure as …

How Different Techniques Hold Up to Diseases

Josh McGillCitrus Expo, Diseases, IPCs

How well reflective mulch, kaolin clay and individual protective covers (IPCs) hold up to HLB, canker and greasy spot diseases was researcher Megan Dewdney’s topic at the 2022 Citrus & Specialty Crop Expo. Dewdney is a University of Florida Institute of Food and Agricultural Sciences associate professor of plant pathology at the Citrus Research and Education Center.  The research project …

Snails Moving Into Young Trees and Covers

Josh McGillFlorida, Pests

Some species of snails in Florida groves, normally seen on irrigation emitters and tree trunks, have recently “taken up residency in young citrus trees,” University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Extension agents Chris Oswalt and Ajia Paolillo reported. Here’s a summary of what the agents wrote in a recent UF/IFAS Central Florida citrus Extension newsletter: Once …

Alternative Management Tools for ACP Under Development

Josh McGillEducation, HLB Management, Psyllids

By Lourdes C. Pérez Cordero Management of the Asian citrus psyllid (ACP) in the HLB era is incredibly important. This well-known insect can vector and facilitate the spread of the bacterium associated with HLB disease. Therefore, effective reduction of ACP populations can be beneficial for the citrus industry. But how exactly do we manage this pest? Unfortunately, there is not …

Use Physical Barriers for Root Health

Josh McGillIPCs, Root health, Tip of the Week

By Larry Duncan Citrus trees in Florida soils infested with diaprepes root weevil (Diaprepes abbreviatus) or sting nematode (Belonolaimus longicaudatus) frequently contend with devastating damage to their root systems. This is made even worse by root loss due to huanglongbing (HLB) disease. Where soil conditions are conducive to the insect or nematode, it is very difficult to prevent major economic …

Sneak Peek: May 2022 Citrus Industry

Josh McGillHLB Management, Pesticides, Sneak Peek

While many citrus growers use similar strategies to cope with HLB, no two approaches are exactly the same. One grower who uses a very different method to manage citrus greening is Chip Henry. In the May cover story of Citrus Industry magazine, he tells how growing organically has helped him successfully fight the disease. Sometimes, production practices aimed at protecting …

Extension Agents Still Seeing Damage From Freeze

Josh McGillFlorida, freeze, Weather

It often takes time for the damage associated with freeze events to manifest in citrus. That was the case for the late January freeze in Florida. While some growers escaped fairly unscathed, others suffered significant damage. The damage began to show in the U.S. Department of Agriculture’s March citrus crop forecast. The agency lowered expected production of Florida oranges this …

Comparison of ACP/HLB Management Tools for Citrus Resets

Josh McGillDiseases, HLB Management, Research

By Lauren Diepenbrock, Megan Dewdney, Christopher Vincent and Davie Kadyampakeni As the threat of potential shutdowns loomed in March 2020, a University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) team put the final plants in the ground, individual protective covers (IPCs) on trees, and kaolin and pesticide applications on a 2.7-acre planting at the Citrus Research and Education …

Sneak Peek: March 2022 Citrus Industry

Josh McGillSneak Peek

The March issue of Citrus Industry magazine includes an abundance of advice on getting trees off to a good start. According to citrus grower Brad Turner, healthy soil is key to setting up trees for success. In his article, he gives growers pointers on soil preparation prior to planting. Other topics he addresses include mulch considerations, nutritional needs, pest management …

Three Florida Citrus Pests of Concern

Ernie NeffPests

Lebbeck mealybug, the Bulimulus sporadicus snail and Brevipalpus mite are Florida citrus pests that were discussed at Citrus Expo in August. University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) entomologist Lukasz Stelinski delivered information about the three pests for fellow UF/IFAS entomologist Lauren Diepenbrock. LEBBECK MEALYBUGLebbeck mealybug damages fruit, leaves and stems. The pest causes fruit drop and …

Covers Prevent Psyllids and HLB

Ernie NeffIPCs

About four years ago, Fernando Alferez started to test whether citrus trees grown inside protective mesh covers could be kept safe from the HLB-spreading Asian citrus psyllid. New research from Alferez shows that citrus trees grown under individual protective covers (IPCs) show no signs of HLB, also known as citrus greening. Specifically, scientists found that psyllids cannot penetrate the IPCs …

Incorporating Newer Tools in Resets

Tacy CalliesProduction

By Lauren M. Diepenbrock Maintaining a productive citrus grove in Florida takes a lot of effort and innovation these days. So much so that growers’ needs can outpace the timeline of the researchers who support this industry. As such, growers often move forward with promising ideas or tools before researchers can provide useful recommendations toward successfully incorporating these tools. The …

Scout for Problems, Even in CUPS

Ernie NeffCUPS, Pests

Growers should monitor for pests and diseases, even in the citrus under protective screen (CUPS) systems designed to keep HLB-spreading psyllids out of trees, according to entomologist Jawwad Qureshi. He told more than 25 people participating in a Dec. 1 virtual seminar that CUPS “are not foolproof systems,” and said citrus can’t be grown successfully without pest management. Qureshi works …

Combining Multiple Methods to Manage HLB

Tacy CalliesGrapefruit, HLB Management, Research

At the recent Citrus Research and Education Center (CREC) field day and open house, Arnold Schumann showed visitors a Jackson grapefruit trial aimed at protecting trees from HLB. Schumann is a professor at the University of Florida Institute of Food and Agricultural Sciences CREC in Lake Alfred. The trial combines the use of individual protective covers (also known as IPCs …

Open House/Field Day Set at CREC

Ernie NeffHLB Management

The work that University of Florida Institute of Food and Agricultural Sciences faculty members have done on HLB will be featured Nov. 16 at the Citrus Research and Education Center (CREC) in Lake Alfred. The center will host growers and others that day at an open house and field day. The morning program will kick off with a panel discussion …

Understanding Mandarin Blooming and Fruit Set Requirements

Tacy CalliesProduction

By Fernando Alferez, Fred Gmitter and Jude Grosser Citrus trees bloom profusely. It is estimated that a healthy adult tree can produce more than 200,000 flowers every year. This figure is much higher than the number of fruits the tree can maintain and develop. Normally, only 1% to 5% of flowers set fruit that develops, matures and can ultimately be …