Florida Blueberry Leaf Disease Guide

'Jewel' SHB

Southern highbush blueberry (SHB) cultivars are commercially grown throughout much of Florida, in both deciduous and evergreen production systems. In both systems, leaves can be damaged by many factors including environmental conditions, chemical applications, insects, and diseases. This new 12-page publication of the UF/IFAS Plant Pathology Department includes basic information to assist growers in determining 1) the likely cause (fungal, viral, algal, or bacterial) of leaf symptoms, 2) when specific leaf spots are likely to occur, 3) characteristic symptoms of common leaf problems, and 4) some of the management options that are available. Written by Douglas A. Phillips, Norma C. Flor, and Philip F. Harmon.

Botryosphaeria Stem Blight on Southern Highbush Blueberry in Florida

'Jewel' SHB

Botryosphaeria stem blight is the most common and damaging fungal vascular disease on southern highbush blueberry in the southern United States, causing stem and cane dieback and reductions in yield. Advanced stages of this disease may cause premature plant death, which results in significant replanting costs for growers. Biotic or abiotic stresses from a variety of sources can make plants more susceptible to infection by stem blight pathogens. This new 5-page publication is intended for Florida blueberry growers to use as a guide in the identification and management of Botryosphaeria stem blight on southern highbush blueberry. Written by Norma C. Flor, Douglas A. Phillips, and Philip F. Harmon and published by the UF/IFAS Plant Pathology Department.

Fungal Gummosis in Peach

Peach fungal gummosis (PFG) is a vascular disease that limits the growth and yield of peach orchards in the southeastern United States. This 6-page document discusses the symptoms and management of PFG. Written by Daniel Mancero-Castillo, Ali Sarkhosh, Sara Sherman, Mercy Olmstead, Philip Harmon, and Thomas Beckham and published by the UF/IFAS Horticultural Sciences Department, July 2018.

Anthracnose on Southern Highbush Blueberry

Information contained in this 4-page publication is intended for Florida blueberry growers to use as a guide in the identification of anthracnose, a group of fungal pathogens that affects a wide range of plants, including southern highbush blueberries (SHB). Written by Douglas A. Phillips, Maria C. Velez-Climent, Philip F. Harmon, and Patricio R. Munoz and published by the UF/IFAS Plant Pathology Department, May 2018.

Bacterial Wilt of Southern Highbush Blueberry Caused by Ralstonia solanacearum

igure 1. Scorch symptoms caused by bacterial wilt disease on 'Arcadia' blueberry. Credits: Philip Harmon, UF/IFAS

Bacterial wilt is a newly discovered disease of blueberry in Florida. Plants with bacterial wilt will show signs of water stress such as wilting and marginal leaf burn. The disease was initially confirmed on three farms in Florida. This three-page fact sheet describes the symptoms, occurrence, and management of bacterial wilt in blueberry. Written by Philip F. Harmon, Carrie Harmon, and Dave Norman and published by the Plant Pathology Department.

2016 Florida Blueberry Integrated Pest Management Guide

Cluster of blueberries.  Photo Credits:  UF/IFAS Photo by Tyler Jones

This 37-page fact sheet provides extensive information about integrated pest management for growing blueberry plants in Florida. Writteny by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar and published by the Horticultural Sciences Department.

Fungal Gummosis in Peach

Amber-brown gumming on young peach trunks caused by Botryosphaeria dothidea.
Fungal gummosis in peach occurs when the fungus Botryosphaeria dothidea infects small openings or wounds in tree branches or trunks. The disease causes blisters on the tree that form lesions and eventually ooze gum (sap). This 3-page fact sheet covers the disease cycle and management of fungal gummosis in peach, which is often difficult to control. Written by Sara Sherman, Mercy Olmstead, Philip Harmon, and Thomas Beckman, and published by the UF Department of Horticultural Sciences, July 2015.

Peach Rust

Typical fruit lesions on mature fruit, which is atypical for peach production in Florida.
Peach rust is a fungal disease that affect the leaves and, less commonly, twigs and fruit of peach trees. The fungus that causes peach rust thrives in Florida’s humid climate and may cause significant economic losses in severely affected orchards. This 5-page fact sheet details peach rust symptoms, disease cycle, and management, including fungicide treatments. Written by Courtney Ligon, Mercy Olmstead, and Phillip Harmon, and published by the UF Department of Horticultural Sciences, June 2015.

HS1156/HS380 Florida Blueberry Integrated Pest Management Guide

HS-1156 is a 35-page illustrated guide adapted for Florida from the Southeast Regional Blueberry Integrated Management Guide by Jeffrey G. Williamson, Philip F. Harmon and Oscar E. Liburd. Primarily tabular in format, it also includes links to additional resources, text descriptions of key pests by stages of flower bud development, and an illustrated guide to recognized stages. Published by the UF Department of Horticultural Science, March 2008.

RFSR007/SR007 Sample Submission Guide for Plant Diagnostic Clinics of the Florida Plant Diagnostic Network.

Revised! RF-SR007, an 8-pageĀ guide by A.J. Palmateer, C.M. Stiles, P.D. Roberts, R.E. Cullen, H. Dankers, R.J. McGovern, N. Peres, P.F. Harmon, and C.L. Harmon, provides extension clientele with the information they need to submit plant samples to Florida Extension Plant Diagnostic Clinics. Published by the UF Department of Plant Pathology, May 2008.