Search Results - James H. Graham

Phytophthora species are important soil-borne fungal pathogens worldwide that attack the root systems, trunks, and fruit of citrus trees at any age. Historical reports from Florida indicated Phytophthora was a problem as early as 1876 on sweet orange seedlings. When roots or tree trunks are affecte...

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Phytophthora species are important soil-borne fungal pathogens worldwide that attack the root systems, trunks, and fruit of citrus trees at any age. Historical reports from Florida indicated Phytophthora was a problem as early as 1876 on sweet orange seedlings. When roots or tree trunks are affecte...

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Developing and maintaining a healthy root system is important for establishment and long-term productivity of trees. Roots take up nutrients and water from the soil to transport them to the tree canopy (the leaves and fruit). The root system also acts as an anchor for the tree, which is important d...

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Developing and maintaining a healthy root system is important for establishment and long-term productivity of trees. Roots take up nutrients and water from the soil to transport them to the tree canopy (the leaves and fruit). The root system also acts as an anchor for the tree, which is important d...

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This 7-page fact sheet is part of the 2019–2020 Florida Citrus Production Guide. Written by Megan M. Dewdney, Evan G. Johnson, and James H. Graham, and published by the Plant Pathology Department, April 2019. PP-156/CG009: 2022–2023 Florida Citrus Production Guide: Phytophthora Foot Rot, Crown Ro...

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Management of brown rot, caused by Phytophthora nicotianae or P. palmivora, is needed on both processing and fresh-market fruit. While the disease affects all citrus types, it is usually most severe on Hamlin, Navel, and other early-maturing sweet orange cultivars. This 3-page fact sheet is part of...

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This 7-page fact sheet is part of the 2018–2019 Florida Citrus Production Guide. Written by M. M. Dewdney, E. G. Johnson, and J. H. Graham, and published by the UF/IFAS Plant Pathology Department, May 2018. PP-156/CG009: 2022–2023 Florida Citrus Production Guide: Phytophthora Foot Rot, Crown Rot,...

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HS-1065, a 4-page illustrated fact sheet by Stephen H. Futch, James H. Graham, and Larry W. Duncan, reviews and evaluates the benefits and drawbacks of two methods of removing diseased or unproductive trees -- pushing the tree down and removing the entire tree and root systems, or clipping the tree...

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This 7-page fact sheet is part of the 2018–2019 Florida Citrus Production Guide. Written by M. M. Dewdney, E. G. Johnson, and J. H. Graham, and published by the UF/IFAS Plant Pathology Department, May 2018. PP-156/CG009: 2022–2023 Florida Citrus Production Guide: Phytophthora Foot Rot, Crown Rot,...

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Citrus canker is a leaf-, fruit-, and stem-blemishing disease that affects most citrus. Severe infections can cause significant fruit drop. It is caused by the bacterium Xanthomonas citri subsp. citri. Grapefruit, Mexican lime, and some early oranges are highly susceptible to canker. Lemons, limes,...

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Citrus canker, caused by the bacterium Xanthomonas citri subsp. citri, is a leaf, fruit, and stem blemishing disease that affects most citrus. This 6-page fact sheet is part of the 2018-2019 Florida Citrus Production Guide. Written by M. M. Dewdney, E. G. Johnson and J. H. Graham, and published by...

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Management of brown rot, caused by Phytophthora nicotianae or P. palmivora, is needed on both processing and fresh market fruit. While the disease affects all citrus types, it is usually most severe on Hamlin, Navel, and other early maturing sweet orange cultivars. This 2-page fact sheet is part of...

Full description

Management of brown rot, caused by Phytophthora nicotianae or P. palmivora, is needed on both processing and fresh-market fruit. While the disease affects all citrus types, it is usually most severe on Hamlin, Navel, and other early-maturing sweet orange cultivars. This 3-page fact sheet is part of...

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PP-231, a 5-page fact sheet by L. W. Timmer, J. H. Graham and H. L. Chamberlain, provides fundamentals of citrus canker management now that the program to eradicate affected trees has ended. It includes information about protecting canker-free areas through decontamination and inoculum suppression,...

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PP-231, a 5-page fact sheet by L. W. Timmer, J. H. Graham and H. L. Chamberlain, provides fundamentals of citrus canker management now that the program to eradicate affected trees has ended. It includes information about protecting canker-free areas through decontamination and inoculum suppression,...

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Citrus canker, caused by the bacterium Xanthomonas citri subsp. citri, is a leaf, fruit, and stem blemishing disease that affects most citrus. This 6-page fact sheet is part of the 2018-2019 Florida Citrus Production Guide. Written by M. M. Dewdney, E. G. Johnson and J. H. Graham, and published by...

Full description

Management of brown rot, caused by Phytophthora nicotianae or P. palmivora, is needed on both processing and fresh market fruit. While the disease affects all citrus types, it is usually most severe on Hamlin, Navel, and other early maturing sweet orange cultivars. This 2-page fact sheet is part of...

Full description

Citrus canker is a leaf-, fruit-, and stem-blemishing disease that affects most citrus. Severe infections can cause significant fruit drop. It is caused by the bacterium Xanthomonas citri subsp. citri. Grapefruit, Mexican lime, and some early oranges are highly susceptible to canker. Lemons, limes,...

Full description