Pamela D. Roberts

0000-0002-6554-571X

Disease Control for Snap Beans in Florida

Shouan Zhang, Nicholas Dufault, Mathews Paret, Pamela Roberts, Guodong Liu, and Qingren Wang

This publication suggests a sequential disease control program for snap beans in Florida. Postharvest disease problems are addressed only to the extent that they are affected by field practices. The application of the following sequential control program should minimize yield losses for the majority of plantings.

Vegetable Diseases Caused by Phytophthora capsici in Florida

Pamela D. Roberts and Thomas A. Kucharek

Silicon Effects on Resistance of St. Augustinegrass to Southern Chinch Bugs and Plant Disease

Alan L. Wright, Ronald H. Cherry, andPamela D. Roberts

Downy Mildew of Basil in South Florida

Shouan Zhang, Pamela D. Roberts, andRichard N. Raid

Bacterial Spot of Pepper

Camille McAvoy, Camille McAvoy, Pamela D. Roberts, andJeffrey B. Jones

Pepper fruits in the genus Capsicum are produced worldwide as a fresh vegetable, dried for spices, or used in commercial products such as dietary supplements or natural coloring in cosmetic products. A limiting disease problem on all peppers is bacterial spot caused by three species of Xanthomonas (X. euvesicatoria, X. perforans, and X. gardneri). Bacterial spot causes severe defoliation, resulting in reduced plant vigor, exposure of fruit to sunburn, and reduced yield. Infected fruit are unmarketable due to lesions on fruit surface. Total yield losses in severely affected crops can occur.

Some Common Diseases of Pepper in Florida

Gary Vallad andPamela D. Roberts

This fact sheet describes the symptoms of several commonly observed diseases and provides recommendations for control.

Pepper Mild Mottle Virus

Pamela D. Roberts and Scott Adkins

2024 Florida Plant Disease Management Guide: Watermelon

Pamela D. Roberts

A UF/IFAS numbered Management for Commercial audience(s).

Pepper Stip: An Abiotic Disorder of Unknown Cause Affecting Pepper Fruit

Camille McAvoy, Camille McAvoy, andPamela D. Roberts

Pepper stip (meaning speck in German), also referred to as color speck or colour spotting outside the US, is considered a physiological disorder of pepper. The disorder is believed to be related to high calcium status with levels of NH3-N and K playing a role. This 3-page factsheet of the UF/IFAS Plant Pathology Department summarizes known symptoms, causes, and potential environmental stressors that may result in stip development on peppers. Written by Camille McAvoy and Pamela Roberts.

Chapter 7. Cucurbit Production

Craig Frey, Nathan S. Boyd, Qingren Wang, Johan Desaeger, Jawwad Qureshi, Anna Mészáros, Nicholas S. Dufault, Pamela D. Roberts, andXavier Martini

Chapter 7 of the Vegetable Production Handbook of Florida

Recommendations for Management of Whiteflies, Whitefly-Transmitted Viruses, and Insecticide Resistance for Production of Cucurbit Crops in Florida

Xavier Martini, Ioannis Karapanos, Sanju Kunwar, Scott Adkins, Jane E. Polston, Pamela D. Roberts, Oscar E. Liburd, Teresia W. Nyoike, Eugene McAvoy, Susan E. Webb, andAlicia J. Whidden

This publication lists and describes common viruses spread in cucurbit crops by whiteflies. It includes strategies for managing whiteflies, most of them originally from a similar publication on managing whiteflies in tomatoes.

The Florida Plant Diagnostic Network

C. L. Harmon, A. Hodges, N. Peres, P. D. Roberts, L. Buss, W. T. Crow, J. Xin, and M. Paret

A UF/IFAS numbered Fact Sheet.

Chapter 14. Potato Production

Lincoln Zotarelli, De-Fen Mou, Peter J. Dittmar, Pamela D. Roberts, Johan Desaeger, Evelyn V. "Prissy" Fletcher, andBonnie Wells

Chapter 14 of the Vegetable Production Handbook of Florida

2026–2027 Florida Citrus Production Guide: Citrus Black Spot

Megan M. Dewdney, Callie Walker, Pamela D. Roberts, andNatalia A. Peres

2026–2027 Florida Citrus Production Guide (Current Season Spray Guide).

Tomato Brown Rugose Fruit Virus (ToBRFV): A Potential Threat for Tomato Production in Florida

Ozgur Batuman, Salih Yilmaz, Pamela Roberts, Eugene McAvoy, Samuel Hutton, Kishore Dey, and Scott Adkins

A UF/IFAS numbered peer reviewed Management for Commercial audience(s). Published by Integrated Pest Management

Florida Plant Disease Management Guide: Sweet Basil

Shouan Zhang, Geoffrey Meru, and Pamela D. Roberts

A UF/IFAS numbered Management.

Fusarium Crown and Root Rot of Tomato in Florida

Shouan Zhang, Pamela D. Roberts, Geoffrey Meru, Robert J. McGovern, and Lawrence E. Datnoff

A UF/IFAS numbered Management for Commercial audience(s).

UF AgriGator Spray Program: Watermelon

Nicholas S. Dufault, Mathews Paret, Kiersten R. Fullem, Pamela D. Roberts, Gary Vallad, andSusannah Da Silva

This guide is intended as a resource for Extension agents and growers and contains information about common oomycete, fungal, and bacterial disease issues in watermelon production. It contains management considerations, information on commonly encountered diseases, and a suggested seasonal spray schedule tailored to specific disease concerns. This publication has been created using data from pesticide efficacy trials and input from experts in watermelon production.

Chapter 12. Onion, Leek, and Chive Production

Johan Desaeger, Peter J. Dittmar, Pamela D. Roberts, Xavier Martini, andLincoln Zotarelli

Chapter 12 of the Vegetable Production Handbook of Florida

2026–2029 Florida Citrus Production Guide: Citrus Black Spot

Megan M. Dewdney, Callie Walker, Pamela D. Roberts, andNatalia A. Peres

2026–2029 Florida Citrus Production Guide (Citrus Production Fundamentals).

Disease Control for Florida Tomatoes

Shouan Zhang, Mathews Paret, Ken Pernezny, and Pamela Roberts

Successful disease management has always been vital in Florida tomato production, given the generally ideal environmental conditions for most plant diseases. An integrated disease management program is a successful approach.

Antibiotics in Crop Production

Ute Albrecht, Leigh Archer, and Pamela Roberts

A UF/IFAS numbered peer reviewed Fact Sheet for Commercial audience(s). in support of UF/IFAS Extension program: Plant Systems

Powdery Mildew on Watermelon in Florida

Pamela D. Roberts, Mathews Paret, and Nicholas Dufault

This document discusses the symptoms and management of powdery mildew, a problematic fungal disease, on watermelon in Florida.

Chapter 8. Eggplant Production

Pamela D. Roberts, Craig Frey, Anna Mészáros, Nathan S. Boyd, Johan Desaeger, andJawwad Qureshi

Chapter 8 of the Vegetable Production Handbook of Florida