Philip F. Harmon

0000-0003-2288-5148

Peach Scab

Daniel Mancero-Castillo, Ali Sarkhosh, Mercy Olmstead, and Phillip Harmon

Algal Stem Blotch in Southern Highbush Blueberry in Florida

Douglas Phillips, Norma Flor, and Phillip Harmon

Mosaic Disease of St. Augustinegrass Caused by Sugarcane Mosaic Virus

Phil Harmon

Anthracnose on Southern Highbush Blueberry

Douglas A. Phillips, Maria C. Velez-Climent, Philip F. Harmon, and Patricio R. Munoz

Take-all Root Rot

M. L. Elliott and P. F. Harmon

This document discusses the root rot disease affecting warm season turfgrasses, caused by the pathogen Gaeumannomyces graminis var. graminis. The disease is triggered by high rainfall and stressed turfgrass, leading to symptoms such as yellow patches and rotted roots. Cultural controls, including proper mowing and balanced nitrogen-potassium applications, are essential for managing the disease. Preventative fungicides can be used but are less effective once symptoms appear. The document emphasizes the importance of stress prevention and provides detailed guidelines for turfgrass management to mitigate the impact of the disease. First published: July 1994.

Fungal Gummosis in Peach

Daniel Mancero-Castillo, Ali Sarkhosh, Sara Sherman, Mercy Olmstead, Philip Harmon, and Thomas Beckman

Southern Wilt of Geranium

Philip F. Harmon, Carrie L. Harmon, David Norman, and Tim Momol

Rust

M. L. Elliott and P. F. Harmon

Peach Rust (Transchelia spp.)

Daniel Mancero-Castillo, Ali Sarkhosh, Courtney Ligon, Mercy Olmstead, and Philip Harmon

Cercospora Leaf Spot

M. L. Elliott and P. F. Harmon

Large Patch

M. L. Elliott and P. F. Harmon

This document discusses the occurrence and management of large patch disease in warm-season turfgrasses, particularly St. Augustinegrass and zoysiagrass. It explains the conditions that trigger the disease, symptoms, and signs of infection. The article emphasizes cultural controls, such as nutrient and water management, and chemical controls, including various fungicides. It also highlights the importance of integrating cultural practices with chemical treatments for effective disease management and recovery of turfgrass. First published: May 1991.

Pythium Root Rot

M. L. Elliott and P. F. Harmon

Fairy Rings

M. L. Elliott and P. F. Harmon

Evergreen Production System for Southern Highbush Blueberries in Florida

Douglas A. Phillips, Jeffrey G. Williamson, and Patricio R. Munoz

Florida Blueberry Leaf Disease Guide

Douglas A. Phillips, Norma C. Flor, and Philip F. Harmon

Key for Identification of Landscape Turfgrass Diseases

P. F. Harmon and M. L. Elliott

This document provides a key for the preliminary diagnosis of landscape turfgrass diseases, focusing on common issues in Florida. It includes sections on disease identification, pathogen details, affected turfgrasses, occurrence timing, symptoms, cultural controls, and chemical treatments. The key helps narrow down potential disease problems and offers links to more specific diagnostic resources. For unresolved issues, consulting local extension offices or submitting samples to diagnostic clinics is recommended. First published: July 1991.

Helminthosporium Leaf Spot

M. L. Elliott and P. F. Harmon

Peach Brown Rot

Ali Sarkhosh, Shirin Shahkoomahally, Logan Marie Richmond-Cosie, and Philip Harmon

Homeowner's Guide to Fungicides for Lawn and Landscape Disease Management

Philip Harmon and Aaron Palmateer

Turfgrass Disease Management

M. L. Elliott and P. F. Harmon

Pythium Blight on Overseeded Turfgrass

Philip F. Harmon

Gray Leaf Spot of St. Augustinegrass: Cultural and Chemical Management Options

Philip Harmon

Professional Disease Management Guide for Ornamental Plants

P. F. Harmon and S. D. Bledsoe

Calendar for Southern Highbush Blueberry Management in Florida

Douglas A. Phillips, Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter J. Dittmar

Botrytis Blossom Blight of Southern Highbush Blueberry

Philip F. Harmon

Anthracnose

M. L. Elliott and P. F. Harmon

Rusts on Ornamentals in Florida

Philip F. Harmon, Carrie L. Harmon, Aaron J. Palmateer, and Stephen H. Brown

Bacterial Wilt of Southern Highbush Blueberry Caused by Ralstonia solanacearum

Philip F. Harmon, Carrie Harmon, and Dave Norman

Botryosphaeria Stem Blight on Southern Highbush Blueberry in Florida

Norma C. Flor, Douglas A. Phillips, and Philip F. Harmon

Stem blight is the most common disease that kills our blueberry bushes in Florida. In most cases, stem blight finishes the job, but other stresses play a lead or contributory role. When stem blight starts showing up in a production field, first check for all of the above discussed stressors, diseases, and pests. Once identified, developing an integrated and comprehensive disease management plan will help you stay one step ahead of stem blight.

Phytophthora Root Rot on Southern Highbush Blueberry in Florida

Norma C. Flor, Douglas A. Phillips, and Philip F. Harmon

Roots serve the vital function of water and nutrient uptake for plants. Healthy roots provide the foundation for productive blueberry bushes and require the right horticultural inputs and soil environment to thrive. Less-than-ideal conditions can result in unhealthy, rotten roots, sometimes caused by disease. The most common and destructive root rot disease of southern highbush blueberry (SHB) in Florida is Phytophthora root rot (PRR), caused by the oomycete pathogen Phytophthora cinnamomi Rands. Oomycetes, or “water molds,” favor water-saturated environments. The distinction between oomycetes and fungi is important for disease management, because many fungicides work for only one group, not both. Worldwide, P. cinnamomi is a devastating pathogen of approximately 5,000 woody plant host species. For blueberry growers in Florida, PRR is a persistent problem that is currently managed through careful site selection, preparation, and routine Phytophthora-specific fungicide applications. 

Impacts of Hurricane Damage on Southern Highbush Blueberries

Douglas A. Phillips, Jeffrey G. Williamson, and Philip F. Harmon

This publication discusses the types of hurricane damage that can be incurred in blueberry production operations, the impacts of these damages, preparations to make before the storm arrives, and suggestions on best management practices in the aftermath of a storm.

2024 Florida Blueberry Integrated Pest Management Guide

Philip F. Harmon, Oscar E. Liburd, Peter Dittmar, Jeffrey G. Williamson, and Doug Phillips

This publication is intended to be a resource for Florida blueberry growers to use in scouting for disease and insect/mite pest damage; managing disease, insect/mite pests, and weeds; and application of certain plant growth regulators.

Sample Submission Guide for Plant Diagnostic Clinics of the Florida Plant Diagnostic Network

N. Peres, P. F. Harmon, and C. L. Harmon

A UF/IFAS numbered Fact Sheet.

Blueberry Advisory System: A Disease Alert System for Blueberry Anthracnose Fruit Rot

André B. Gama, Douglas A. Phillips, Vinícius A. Cerbaro, Phillip F. Harmon, Clyde W. Fraisse, and Natalia A. Peres

The weather conditions favoring Blueberry anthracnose fruit rot disease incidence and development can be difficult to predict, and it can significantly impact yield under conducive weather patterns. For that reason, the authors of this new 6-page publication of the UF/IFAS Plant Pathology Department developed and validated a web-based disease alert system for blueberry AFR, the Blueberry Advisory System (BAS), to help blueberry growers in Florida identify weather conditions favorable for the disease and improve disease management. Written by André B. Gama, Douglas A. Phillips, Vinícius A. Cerbaro, Phillip F. Harmon, Clyde W. Fraisse, and Natalia A. Peres.

Organic Blueberry Production in Florida

Douglas A. Phillips, Peter J. Dittmar, Philip F. Harmon, Oscar E. Liburd, Danielle D. Treadwell, and Jeffrey G. Williamson

A UF/IFAS numbered peer reviewed Fact Sheet for Commercial audience(s). Published by Plant Systems