citrus nutrition

Reducing Psyllid Populations During Key Periods Pays Dividends

Jim Rogers HLB Management, Pesticides, Pests

By Lukasz L. Stelinskiand Jawwad A. Qureshi Asian citrus psyllids (ACP) are at the mercy of their host (citrus) for survival. They need flush to lay eggs and for the nymphs to develop. Prior to HLB, the majority of flushing had been fairly predictable and occurred in the early spring and late summer. The occurrence of flush in young trees …

HLB Strategies From Zoom’okalee

Jim Rogers HLB Management

In a Jan. 12 virtual Zoom seminar from Immokalee (dubbed “Zoom’okalee” in the presentation), researcher Ozgur Batuman reviewed old and new approaches to controlling HLB. The seminar was titled “Citrus Disease Trends We Should Heed: HLB, Phytophthora and Leprosis.” Batuman works for the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Southwest Florida Research and Education Center (SWFREC) …

Coordinated HLB Treatment Critical in California

Jim Rogers HLB Management

In an open letter to California citrus growers, Jim Gorden, chair of the Citrus Pest & Disease Prevention Committee, emphasized the importance of cooperation of all growers to keep huanglongbing (HLB) at bay. Growers need to work together to coordinate treatments for maximum effectiveness. “As the threat of HLB continues, industry members know that the best way to prevent HLB …

Multistate Scientists Seek HLB Tolerance

Jim Rogers HLB Management, Research

A $1.5 million emergency grant is enabling scientists in citrus-producing states to find trees tolerant to the devastating citrus disease HLB. The disease has crippled Florida’s citrus industry and has already been detected in California, which grows 80% of America’s fresh citrus. The National Institute of Food and Agriculture is supporting scientists at the University of California, Riverside (UCR); the University …

Gibberellic Acid Label Concerns Allayed

Ernie Neff All In For Citrus Podcast, HLB Management

University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) researchers have found that gibberellic acid (GA) applications can improve productivity of HLB-affected Valencia trees. But some growers are concerned that the GA label may not allow that use. Citrus Research and Education Center Director (CREC) Michael Rogers allays that concern. Rogers says some are concerned “because the recommendations that …

Texas Researchers to Lead HLB Project

Ernie Neff HLB Management, Research

Scientists from Texas A&M AgriLife Research will lead a public-private collaboration across Texas, Florida, California and Indiana to advance new, environmentally friendly and commercially viable HLB control strategies. The $7 million, four-year AgriLife Research project is part of an $11 million suite of grants from the U.S. Department of Agriculture National Institute of Food and Agriculture. In addition to Texas …

HLB Quarantines Established in Alabama

Tacy Callies HLB Management, Regulation

Effective immediately, the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS), in cooperation with the Alabama Department of Agriculture and Industries (ADAI), is establishing new quarantines for huanglongbing (HLB; citrus greening disease). The new quarantines are effective in all areas of Baldwin and Mobile counties in Alabama. APHIS is taking this action because of HLB detections in …

ACP Management With UV-Reflective Mulch and Flush-Timed Sprays

Tacy Callies HLB Management

By Jawwad Qureshi, Lauren Diepenbrock and Davie Kadyampakeni The future of the Florida citrus industry depends on successfully replacing the present bearing tree inventory with new plantings and transitioning them into crop production. This would be a relatively routine process were it not for the ubiquitous presence of huanglongbing (HLB) and its vector, Asian citrus psyllid (ACP). Early infection can …

Combining Multiple Methods to Manage HLB

Tacy Callies Grapefruit, 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 …

New HLB Find Is Likely Farthest North in Florida

Ernie Neff HLB Management

What is believed to be the most northern HLB find in Florida was made the first week of November in a backyard Satsuma tree in Tallahassee. A homeowner sent photos of the tree’s symptoms to Leon County Extension horticulture agent Mark Tancig, who collected samples that were confirmed as HLB. “I’ve told the homeowner he should remove it (the tree), …

Researchers Share Tree Health Suggestions

Ernie Neff HLB Management

University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) researchers gave a crowd of growers suggestions that can help keep citrus trees healthy. The panel discussion was part of the Nov. 16 open house and field day at the UF/IFAS Citrus Research and Education Center in Lake Alfred. HLB-affected trees need enhanced nutrition “throughout the growing season,” said horticulturist …

HLB Changed UF/IFAS Recommendations

Ernie Neff HLB Management

Kelly Morgan recently summarized several recommended changes in Florida citrus production practices brought on by the devastating disease HLB. Morgan is a University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) soil and water science professor. He discussed what growers need to know to follow best management practices (BMPs) at the recent Citrus Nutrition Day at the UF/IFAS Citrus …

Fertilization Splitting Helps With HLB

Ernie Neff HLB Management, Nutrition

Researchers at the University of Florida have found a way to manage groves infected with HLB by managing the timing of their fertilization. By splitting the application of nutrients to citrus rootstocks, they have been able to improve plant growth and fruit yields. The research was recently published in Soil Science Society of America Journal. Alisheikh Atta and his colleagues …

Manage Psyllids at Reduced Cost

Ernie Neff HLB Management

At the 2021 Citrus Expo, entomologist Lukasz Stelinski suggested ways growers can manage HLB-spreading Asian citrus psyllids (ACP) while reducing costs. Some of the University of Florida Institute of Food and Agricultural Sciences entomologist’s key points follow: Psyllid density is related to tree stress; more psyllids lead to higher damage, compromising tree health and yield. Spray for adults at bud …

Oak Leaf Extract Tested as HLB Tool

Ernie Neff HLB Management

In the search for solutions to HLB, a formulation based on oak leaf extract has been developed by citrus growers Travis Murphy and Tom Thayer, the Indian River Citrus League’s October River Ramblings newsletter reported. The formulation was developed following the growers’ observations that citrus trees under oak trees were free of HLB compared to nearby field trees that had …

Open House/Field Day Set at CREC

Ernie Neff HLB 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 …

HLB Research Is Focus of Short Videos

Ernie Neff HLB Management

Two short videos about HLB-related research were available at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) booth at Citrus Expo in August. The videos are available online for viewing. UF/IFAS researcher Tripti Vashisth narrated the video, HLB-Associated Preharvest Fruit Drop. She said up to 40% of fruit can drop from mildly HLB-symptomatic trees shortly before harvest, …

Stop HLB Vector, Spanish Group Says

Ernie Neff HLB Management

The Valencian Association of Farmers (AVA-ASAJA) recently stated it is essential that the Spanish government and the European Union (EU) prevent the advance of Trioza erytreae, vector of the citrus disease HLB. The association issued that statement after learning that the insect has reached the Algarve (southern Portugal). The vector’s advance from the north and center of the Portuguese country …

Floridians Discuss HLB on Australia TV

Ernie Neff HLB Management

A Florida citrus grower and a Florida citrus researcher were quoted extensively in a recent Australia Broadcasting Corporation TV show about HLB. Grower Kyle Story and University of Florida Institute of Food and Agricultural Sciences plant pathologist Megan Dewdney appeared in an approximately 12-minute segment of the show Landline. The segment’s focus was Australia’s effort to keep HLB out of …

Fungus Suppresses Asian Citrus Psyllids

Ernie Neff HLB Management

The citrus disease HLB, also known as citrus greening, has a formidable enemy in a fungal pathogen, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) researchers reported. The fungus is Cordyceps javanica, strain Apopka, discovered by research scientist Lance Osborne in the mid-1980s. The fungus was isolated from dead insects on plants in a greenhouse at the UF/IFAS …