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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.

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.

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. https://edis.ifas.ufl.edu/pp366

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. https://edis.ifas.ufl.edu/pp366

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. http://edis.ifas.ufl.edu/pp348

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. http://edis.ifas.ufl.edu/pp348

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. http://edis.ifas.ufl.edu/pp348

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. http://edis.ifas.ufl.edu/pp347

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. http://edis.ifas.ufl.edu/pp347

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. http://edis.ifas.ufl.edu/pp347

This 38-page publication provides current information on pest, disease, and weed management, and plant growth regulator use for commercial blueberries in Florida. It is a minor revision written by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, and published by the Horticultural Sciences Department, September 2018. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

This 38-page publication provides current information on pest, disease, and weed management, and plant growth regulator use for commercial blueberries in Florida. It is a minor revision written by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, and published by the Horticultural Sciences Department, September 2018. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

This 38-page publication provides current information on pest, disease, and weed management, and plant growth regulator use for commercial blueberries in Florida. It is a minor revision written by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, and published by the Horticultural Sciences Department, September 2018. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

Peach rust is a fungal disease commonly caused by Tranzchelia discolor (Fuckel) Tranzschel & Litvinov that attacks plants in the genus Prunus, including peach, nectarine, almond, plum, apricot, and cherry. In the Southeastern United State, the fungus is most common on peach orchards during summer and fall. The peach rust severity depends on the climatic conditions (temperature and rainfall), hosts (peach cultivars) and geographic location. Fungus rust is spread by airborne spores, which depend on moisture for infection. Where warm temperatures and high rainfalls usually result in severe peach rust infections. Florida’s summer rainfall provide favorable conditions for peach rust development. Despite, all currently available cultivars of peach in Florida are susceptible to the disease (Adaskaveg et al. 2012). Further studies of subtropical peach cultivars have shown differences for peach rust tolerance, measured by leaf retention, and rust incidence in the orchards (Alves et al. 2014; Citadin et al. 2010)

Peach rust is a fungal disease commonly caused by Tranzchelia discolor (Fuckel) Tranzschel & Litvinov that attacks plants in the genus Prunus, including peach, nectarine, almond, plum, apricot, and cherry. In the Southeastern United State, the fungus is most common on peach orchards during summer and fall. The peach rust severity depends on the climatic conditions (temperature and rainfall), hosts (peach cultivars) and geographic location. Fungus rust is spread by airborne spores, which depend on moisture for infection. Where warm temperatures and high rainfalls usually result in severe peach rust infections. Florida’s summer rainfall provide favorable conditions for peach rust development. Despite, all currently available cultivars of peach in Florida are susceptible to the disease (Adaskaveg et al. 2012). Further studies of subtropical peach cultivars have shown differences for peach rust tolerance, measured by leaf retention, and rust incidence in the orchards (Alves et al. 2014; Citadin et al. 2010)

Peach rust is a fungal disease commonly caused by Tranzchelia discolor (Fuckel) Tranzschel & Litvinov that attacks plants in the genus Prunus, including peach, nectarine, almond, plum, apricot, and cherry. In the Southeastern United State, the fungus is most common on peach orchards during summer and fall. The peach rust severity depends on the climatic conditions (temperature and rainfall), hosts (peach cultivars) and geographic location. Fungus rust is spread by airborne spores, which depend on moisture for infection. Where warm temperatures and high rainfalls usually result in severe peach rust infections. Florida’s summer rainfall provide favorable conditions for peach rust development. Despite, all currently available cultivars of peach in Florida are susceptible to the disease (Adaskaveg et al. 2012). Further studies of subtropical peach cultivars have shown differences for peach rust tolerance, measured by leaf retention, and rust incidence in the orchards (Alves et al. 2014; Citadin et al. 2010)

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. https://edis.ifas.ufl.edu/pp337

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. https://edis.ifas.ufl.edu/pp337

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. https://edis.ifas.ufl.edu/pp337

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 3-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, November 2016. PP332/PP332: Bacterial Wilt of Southern Highbush Blueberry Caused by Ralstonia solanacearum (ufl.edu)

This revised 37-page fact sheet provides extensive information about integrated pest management for growing blueberry plants in Florida. Written by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, and published by the Horticultural Sciences Department, March 2016. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

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 3-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, November 2016. PP332/PP332: Bacterial Wilt of Southern Highbush Blueberry Caused by Ralstonia solanacearum (ufl.edu)

This revised 37-page fact sheet provides extensive information about integrated pest management for growing blueberry plants in Florida. Written by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, and published by the Horticultural Sciences Department, March 2016. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

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 3-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, November 2016. PP332/PP332: Bacterial Wilt of Southern Highbush Blueberry Caused by Ralstonia solanacearum (ufl.edu)

This revised 37-page fact sheet provides extensive information about integrated pest management for growing blueberry plants in Florida. Written by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, and published by the Horticultural Sciences Department, March 2016. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

Recommendations are based on information from the manufacturer’s label and performance data from research and Extension field tests. This 31-page pest management guide was adapted for Florida by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, from the Southeast Regional Blueberry Integrated Management Guide, and published by the UF Department of Horticultural Sciences, November 2012. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

Recommendations are based on information from the manufacturer’s label and performance data from research and Extension field tests. This 31-page pest management guide was adapted for Florida by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, from the Southeast Regional Blueberry Integrated Management Guide, and published by the UF Department of Horticultural Sciences, November 2012. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

Recommendations are based on information from the manufacturer’s label and performance data from research and Extension field tests. This 31-page pest management guide was adapted for Florida by Jeffrey G. Williamson, Philip F. Harmon, Oscar E. Liburd, and Peter Dittmar, from the Southeast Regional Blueberry Integrated Management Guide, and published by the UF Department of Horticultural Sciences, November 2012. HS1156/HS380: 2022 Florida Blueberry Integrated Pest Management Guide (ufl.edu)

Florida’s warm, humid environment is a gardener’s paradise and a great location for ornamental plant producers to grow numerous plant species—but these conditions also are suitable for the development of a wide variety of plant pathogens and insects that can spread them. Florida is also a major port of entry for the international trade of ornamental plants, which carries the risk of introducing exotic invasive pathogens, so growers are required to follow certain phytosanitory regulations. These challenges require growers to develop the most efficient production plans possible, incorporating as many tactics as they can to maximize plant health and minimize opportunities for pest and disease outbreaks—a concept known as integrated pest management (IPM). This revised 16-page fact sheet is intended to be used by growers, landscape professionals, and other pest control operators as a reference for managing ornamental plant diseases. Written by P. F. Harmon and S. D. Bledsoe, and published by the UF Department of Plant Pathology, June 2012. PP-202/PP123: Professional Disease Management Guide for Ornamental Plants (ufl.edu)

Florida’s warm, humid environment is a gardener’s paradise and a great location for ornamental plant producers to grow numerous plant species—but these conditions also are suitable for the development of a wide variety of plant pathogens and insects that can spread them. Florida is also a major port of entry for the international trade of ornamental plants, which carries the risk of introducing exotic invasive pathogens, so growers are required to follow certain phytosanitory regulations. These challenges require growers to develop the most efficient production plans possible, incorporating as many tactics as they can to maximize plant health and minimize opportunities for pest and disease outbreaks—a concept known as integrated pest management (IPM). This revised 16-page fact sheet is intended to be used by growers, landscape professionals, and other pest control operators as a reference for managing ornamental plant diseases. Written by P. F. Harmon and S. D. Bledsoe, and published by the UF Department of Plant Pathology, June 2012. PP-202/PP123: Professional Disease Management Guide for Ornamental Plants (ufl.edu)

Florida’s warm, humid environment is a gardener’s paradise and a great location for ornamental plant producers to grow numerous plant species—but these conditions also are suitable for the development of a wide variety of plant pathogens and insects that can spread them. Florida is also a major port of entry for the international trade of ornamental plants, which carries the risk of introducing exotic invasive pathogens, so growers are required to follow certain phytosanitory regulations. These challenges require growers to develop the most efficient production plans possible, incorporating as many tactics as they can to maximize plant health and minimize opportunities for pest and disease outbreaks—a concept known as integrated pest management (IPM). This revised 16-page fact sheet is intended to be used by growers, landscape professionals, and other pest control operators as a reference for managing ornamental plant diseases. Written by P. F. Harmon and S. D. Bledsoe, and published by the UF Department of Plant Pathology, June 2012. PP-202/PP123: Professional Disease Management Guide for Ornamental Plants (ufl.edu)

Fairy rings, especially the mushrooms, are most commonly observed during the summer months, when Florida receives the majority of its rainfall. This revised 2-page fact sheet with identification and control information was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-7/LH046: Fairy Rings (ufl.edu)

Identify and control for this disease that often appears as reddish-brown spots surrounded by a narrow yellow halo, primarily in centipedegrass. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-56/LH043: Anthracnose (ufl.edu)

This fungal disease is most serious on bermudagrass and acts over a wide range of temperatures. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-9/LH048: Helminthosporium Leaf Spot (ufl.edu)

This disease affects primarily St. Augustinegrass, but also centipedegrass. It is most often observed from late spring to early fall, especially during prolonged periods of rainfall. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. PP204/LH047: Gray Leaf Spot of St. Augustinegrass: Cultural and Chemical Management Options (ufl.edu)

This fungal root disease affecting all warm season turfgrasses is associated with wet soil conditions and causes nonspecific decline in turf quality. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-11/LH050: Pythium Root Rot (ufl.edu)

Turfgrass diseases are underappreciated because the biological organisms (plant pathogens) causing the problems are rarely observed. Fortunately, grasses maintained using proper cultural practices (water, mowing, and fertility) are not as likely to become diseased or be as severely damaged as grasses that do not receive proper care. This 11-page revised fact sheet discusses turfgrass diseases, their causal agents, diagnosis, and management. Written by M. L. Elliott and P. F. Harmon and published by the UF Department of Plant Pathology, February 2011. SSPLP14/LH040: Turfgrass Disease Management (ufl.edu)

Rust is a fungal disease that occurs in cool weather causing yellow specks enlarging to spots with orange pustules in St. Augustinegrass and zoysiagrass. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-12/LH051: Rust (ufl.edu)

Cercospora leaf spot is a fungal disease of St. Augustinegrass observed during periods of frequent rainfall. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-57/LH082: Cercospora Leaf Spot (ufl.edu)

This disease affects primarily St. Augustinegrass, but also centipedegrass. It is most often observed from late spring to early fall, especially during prolonged periods of rainfall. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. PP204/LH047: Gray Leaf Spot of St. Augustinegrass: Cultural and Chemical Management Options (ufl.edu)

Fairy rings, especially the mushrooms, are most commonly observed during the summer months, when Florida receives the majority of its rainfall. This revised 2-page fact sheet with identification and control information was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-7/LH046: Fairy Rings (ufl.edu)

This fungal disease is most serious on bermudagrass and acts over a wide range of temperatures. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-9/LH048: Helminthosporium Leaf Spot (ufl.edu)

Identify and control for this disease that often appears as reddish-brown spots surrounded by a narrow yellow halo, primarily in centipedegrass. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-56/LH043: Anthracnose (ufl.edu)

Rust is a fungal disease that occurs in cool weather causing yellow specks enlarging to spots with orange pustules in St. Augustinegrass and zoysiagrass. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-12/LH051: Rust (ufl.edu)

Cercospora leaf spot is a fungal disease of St. Augustinegrass observed during periods of frequent rainfall. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-57/LH082: Cercospora Leaf Spot (ufl.edu)

Turfgrass diseases are underappreciated because the biological organisms (plant pathogens) causing the problems are rarely observed. Fortunately, grasses maintained using proper cultural practices (water, mowing, and fertility) are not as likely to become diseased or be as severely damaged as grasses that do not receive proper care. This 11-page revised fact sheet discusses turfgrass diseases, their causal agents, diagnosis, and management. Written by M. L. Elliott and P. F. Harmon and published by the UF Department of Plant Pathology, February 2011. SSPLP14/LH040: Turfgrass Disease Management (ufl.edu)

This fungal root disease affecting all warm season turfgrasses is associated with wet soil conditions and causes nonspecific decline in turf quality. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-11/LH050: Pythium Root Rot (ufl.edu)

Fairy rings, especially the mushrooms, are most commonly observed during the summer months, when Florida receives the majority of its rainfall. This revised 2-page fact sheet with identification and control information was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-7/LH046: Fairy Rings (ufl.edu)

Identify and control for this disease that often appears as reddish-brown spots surrounded by a narrow yellow halo, primarily in centipedegrass. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. SS-PLP-56/LH043: Anthracnose (ufl.edu)

This disease affects primarily St. Augustinegrass, but also centipedegrass. It is most often observed from late spring to early fall, especially during prolonged periods of rainfall. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011. PP204/LH047: Gray Leaf Spot of St. Augustinegrass: Cultural and Chemical Management Options (ufl.edu)