Nutrition and Irrigation Management for Florida HLB-Affected Trees

Microsprinkler irrigation on oranges.

To improve production of huanglongbing (HLB) affected trees, nutrition, irrigation, and soil pH should be considered together, because each can influence the efficacy of the others in overcoming the effects of HLB on tree performance. This two-sided poster published by the UF/IFAS Horticultural Sciences Department through the UF/IFAS Citrus Research and Education Center was written by Tripti Vashisth, Davie Kadyampakeni, and Jamie D. Burrow.
https://edis.ifas.ufl.edu/hs1367

Management of Citrus Tree Canopies for Fresh-Fruit Production

Removal of sucker shoots from rootstock, bud union, and tree trunk, before (left) and after (right). Credit: International Citrus Technologies Pty Ltd, Western Australia

Canopy management is a useful tool to induce precocity and maintain high production of optimum-sized, high-quality fruit. The aim of this new 8-page publication of the UF/IFAS Department of Soil and Water Sciences is to provide growers with practical tools with which to manage their trees for maximum fresh-fruit yield, quality, and profitability. Written by Andrew Krajewski, Arnold Schumann, Tim Ebert, Chris Oswalt, Rhuanito S. Ferrarezi, and Laura Waldo.
https://edis.ifas.ufl.edu/ss698

Management Options for Improving Flowering in Citrus Production

Hamlin variety oranges flowering. Credits: Miurel Brewer, UF/IFAS

The final fruit yield and, ultimately, returns a grower receives from any given harvest is directly related to the number of viable flowers that are generated and the proportion of those flowers that produce fruit. A grower can improve the ability for their trees to consistently produce a profitable crop of fruit by understanding the steps involved in flowering and controlling the transition to reproductive growth. This new 6-page publication of the UF/IFAS Horticultural Sciences Department was written by Leigh Archer, Miurel Brewer, Bikash Adhikari, Eduardo Esteves, Christopher Vincent, and Tripti Vashisth.
https://edis.ifas.ufl.edu/hs1399

Movement of Plant Nutrients

During the water uptake by the plant, the dissolved mineral nutrients get taken up by the plant and distributed throughout the canopy.Credit: Tonya R. Weeks, UF/IFAS CREC

This new two-page document discusses soil-applied and foliar fertilization for citrus trees as well as mobile and immobile nutrients and how they affect the choice of fertilization. Written by Tripti Vashisth and Chris Oswalt, and published by the UF/IFAS Horticultural Sciences Department.
https://edis.ifas.ufl.edu/hs1373

Citrus Diseases Exotic to Florida: Citrus Leprosis

Leaf lesion on the underside of the leaf, less pronounced (C-type viruses). Credits: H. Gomez, USDA

This article is one in a series designed to provide important information on the causal agent, symptoms, and transmission of exotic citrus diseases. Disseminating the information about the diseases to the citrus industry may prevent their introduction and spread in Florida. This 5-page document will focus on the exotic viral disease citrus leprosis. This is a major revision of an article originally published in 2006. Written by O. Batuman, A. Levy, P. Sieburth, A. M. Paolillo, K.-R. Chung, and R. H. Brlansky, and published by the UF/IFAS Plant Pathology Department.
https://edis.ifas.ufl.edu/pp148

Computer Tools for Diagnosing Citrus Leaf Symptoms (Part 2): Smartphone Apps for Expert Diagnosis of Citrus Leaf Symptoms

A person's hand holding a smartphone, taking a picture of a leaf for analysis.

Visual identification of nutrient deficiencies in foliage is an important diagnostic tool for fine-tuning nutrient management of citrus. This new 2-page article describes a new smartphone app that uses a trained neural network to identify disease and pest symptoms on citrus leaves through your phone’s camera. Written by Arnold Schumann, Laura Waldo, Perseveranca Mungofa, and Chris Oswalt, and published by the UF/IFAS Department of Soil and Water Sciences.
https://edis.ifas.ufl.edu/ss691

Computer Tools for Diagnosing Citrus Leaf Symptoms (Part 1): Diagnosis and Recommendation Integrated System (DRIS)

Diagnosis and Recommendation Integrated System (DRIS) logo

This new 2-page article provides instructions for using the Diagnosis and Recommendation Integrated System, or DRIS, a web tool designed for analyzing leaf nutrient concentrations of Florida citrus. Written by Arnold Schumann and published by the UF/IFAS Department of Soil and Water Sciences.
https://edis.ifas.ufl.edu/ss683