Schumann, Arnold W.

Management of Citrus Tree Canopies for Fresh-Fruit Production

Andrew Krajewski, Arnold Schumann, Tim Ebert, Chris Oswalt, Rhuanito S. Ferrarezi, and Laura Waldo

Citrus Irrigation Management

Davie Kadyampakeni, Kelly Morgan, Mongi Zekri, Rhuanito Ferrarezi, Arnold Schumann, and Thomas Obreza

The chapter on irrigation management of citrus is largely taken from guidelines provided in SL253 on trees prior to Huanglongbing (HLB) prevalent conditions. A section has been added to cover recent findings on water use of trees affected by HLB and the impact this would have on the irrigation management considerations. This document is SL446, one of a series of the Soil and Water Sciences Department, UF/IFAS Extension. Original publication date September 2017.

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 11. Special Situations

Thomas A. Obreza, Brian J. Boman, Mongi Zekri, Stephen H. Futch, Lawrence R. Parsons, James J. Ferguson, Rhuanito Ferrarezi, and Arnold Schumann

This publication is part of SL253, Nutrition of Florida Citrus Trees, 3rd Edition. For references, a glossary, and appendices, please refer to the full document at https://edis.ifas.ufl.edu/ss478.

Soil Sampling Procedures

Davie Kadyampakeni, Kelly Morgan, Arnold Schumann, and Rhuanito S. Ferrarezi

Irrigation Management of HLB-Affected Trees

Davie Kadyampakeni, Kelly Morgan, Mongi Zekri, Rhuanito Ferrarezi, Arnold Schumann, and Thomas A. Obreza

The chapter on irrigation management of citrus is largely taken from guidelines on trees prior to citrus greening provided in Chapter 9 of SL253 (https://edis.ifas.ufl.edu/ss478). A section has been added to cover recent findings on water use of trees affected by citrus greening and the impact this would have on irrigation management considerations. This document is SL445, one of a series of the Department of Soil and Water Sciences, UF/IFAS Extension. Original publication date October 2017.

How to Characterize Soil Variability in Florida Citrus Groves as It Relates to Tree Growth and Yield

Kirandeep K. Mann, Arnold W. Schumann, Thomas A. Obreza, Willie G. Harris, and Jerry B. Sartain

Nutrition of Florida Citrus Trees, 3 Edition: Chapter 5. Precision Agriculture for Citrus Nutrient Management

Arnold W. Schumann and Edward A. Hanlon

Increasing Efficiency and Reducing Costs of Citrus Nutritional Programs

Mongi Zekri, Thomas Obreza, and Arnold Schumann

Soil and Leaf Tissue Testing for Commercial Citrus Production

Thomas A. Obreza, Mongi Zekri, Edward A. Hanlon, Kelly Morgan, Arnold Schumann, and Robert Rouse

2024–2025 Florida Citrus Production Guide: Citrus under Protective Screen (CUPS) Production Systems

Arnold W. Schumann, Ariel Singerman, Mark A. Ritenour, Jawwad Qureshi, and Fernando Alferez

2024–2025 Florida Citrus Production Guide

2024–2025 Florida Citrus Production Guide: Fertilizer Application Methods

Mongi Zekri, Arnold W. Schumann, Tripti Vashisth, Davie M. Kadyampakeni, Kelly T. Morgan, Brian Boman, Muhammad A. Shahid, and Thomas A. Obreza

2024–2025 Florida Citrus Production Guide

2024–2025 Florida Citrus Production Guide: Irrigation Management of Citrus Trees

Davie M. Kadyampakeni, Kelly T. Morgan, Mongi Zekri, Arnold W. Schumann, Sandra Guzmán, Fernando Alferez, Muhammad A. Shahid, and Thomas A. Obreza

2024–2025 Florida Citrus Production Guide

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

Arnold Schumann, Laura Waldo, Perseveranca Mungofa, and Chris Oswalt

A UF/IFAS numbered peer reviewed Fact Sheet. in support of UF/IFAS Extension program: Plant Systems

2024–2025 Florida Citrus Production Guide: Nutrition Management for Citrus Trees

Kelly T. Morgan, Davie M. Kadyampakeni, Mongi Zekri, Arnold W. Schumann, Tripti Vashisth, Muhammad A. Shahid, and Thomas A. Obreza

2024–2025 Florida Citrus Production Guide

Fertigation for Citrus Trees

Mongi Zekri, Arnold Schumann, Tripti Vashisth, Davie Kadyampakeni, Kelly Morgan, Brian Boman, and Tom Obreza

A UF/IFAS numbered Fact Sheet. Published by Plant Systems

A Close-up Look at Screens for Excluding Asian Citrus Psyllids

Timothy A. Ebert, Arnold W. Schumann, Laura Waldo, Daniel Stanton, and Philippe Rolshausen

Building a physical barrier around citrus trees or groves can prevent contact between trees and Asian citrus psyllids, the carrier of the pathogen that causes huanglongbing. This new 4-page article is for growers, scientists, and industries that are interested in this approach to protect citrus from huanglongbing. Written by Timothy A. Ebert, Arnold W. Schumann, Laura Waldo, Daniel Stanton, and Philippe Rolshausen, and published by the UF/IFAS Department of Soil and Water Sciences.

Managing Fruit Splitting in Florida Citrus

Andrew Krajewski, Timothy Ebert, Arnold Schumann, and Laura Waldo

Sometimes, the fruit on citrus trees will split open, making the fruit unmarketable; splitting can aid fungal and insect pests that subsequently damage fruit. A physiological disorder, pre-harvest fruit splitting begins with nutrient imbalances at flowering. Nutrient deficiencies weaken the rind, causing it to crack if interior parts of the fruit expand too quickly. Symptoms are only visible after it is too late to avoid the problem, but mitigation is still possible. Our goal is to define the problem and suggest management tactics for growers and Extension personnel to avoid or mitigate pre-harvest fruit splitting.