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Reviewed March 2020 Publishing Information The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) is an Equal Opportunity Institution. UF/IFAS is committed to diversity of people, thought and opinion, to inclusiveness and to equal opportunity. The use of trade names in this publication is solely for the purpose of providing specific information. UF/IFAS does not guarantee or warranty the products named, and references to them in this publication do not signify our approval to the exclusion of other products of suitable composition. All chemicals should be used in accordance with directions on the manufacturer’s label. Use pesticides and herbicides safely. Read and follow directions on the manufacturer’s label. For questions about using pesticides, please contact your local county Extension office. Visit http://solutionsforyourlife.ufl.edu/map to find an office near you. Copyright 2014, The University of Florida Editors Jennifer L. Gillett-Kaufman (UF/IFAS) Verena-Ulrike Lietze (UF/IFAS) Emma N.I. Weeks (UF/IFAS) Contributing Authors Julie Baniszewski (UF/IFAS) Ted D. Center (USDA/ARS, retired) Byron R. Coon (Argosy University) James P. Cuda (UF/IFAS) Amy L. Giannotti (City of Winter Park) Judy L. Gillmore (UF/IFAS) Michael J. Grodowitz (U.S. Army Engineer Research and Development Center) Dale H. Habeck, deceased (UF/IFAS) Nathan E. Harms (U.S. Army Engineer Research and Development Center) Jeffrey E. Hill (UF/IFAS) Verena-Ulrike Lietze (UF/IFAS) Jennifer Russell (UF/IFAS) Emma N.I. Weeks (UF/IFAS) Marissa L. Williams (City of Maitland) External Reviewers Nancy L. Dunn (Florida LAKEWATCH volunteer) Stephen D. Hight (USDA-ARS and Florida A&M University, Center for Biological Control) Mark V. Hoyer (UF/IFAS and Florida LAKEWATCH) Jerry C. Renney Jr. (Applied Aquatic Management) Kelle B. Sullivan (Florida Fish and Wildlife Conservation Commission) Design Mark S. Hendrick (Boyd Brothers Printing, Inc.), book cover Jane C. Medley (UF/IFAS), page template and diagrams Hydrilla Integrated Management i Publisher UF/IFAS Entomology and Nematology Department Acknowledgments We acknowledge the funding provided for salaries and printing by the U.S. Department of Agriculture, National Institute of Food and Agriculture, Risk Avoidance and Mitigation Program (grant 2010-02825). The production of this guide would not have been possible without this generous financial support. Our special thanks go to Mark Hendrick (Boyd Brothers Printing, Inc.) for designing the front and back covers and to Jane Medley (UF/IFAS) for designing the page template of this guide as well as the graphics for the diagrams on pages 6, 15, 59 and 77. We thank the UF/IFAS Center for Aquatic and Invasive Plants for generously providing many images, and all photographers for allowing us to use their photos. We thank Donald Rainey (UF/IFAS) for reviewing the Nutrient Management section in chapter 4 and Jeff Schardt (Florida Fish and Wildlife Conservation Commission) for assessing our responses to stakeholder questions in chapter 7. Last but not least we appreciate the ongoing support received from our Extension advisory committee members Lorrie Bush (St. Lucie West Services District), Stephen Hight (U.S. Department of Agriculture, Agricultural Research Service; and Florida A&M University, Center for Biological Control), Jerry Renney (Applied Aquatic Management), Kelle Sullivan (Florida Fish and Wildlife Conservation Commission), and Bridgett Tolley (Osceola County and South Florida Water Management District); and the collaboration with our Extension partners Joan Bradshaw (UF/IFAS Extension, Emeritus), Ken Gioeli (UF/IFAS Extension, St. Lucie County), and Stacia Hetrick Delaney (formerly UF/IFAS Extension, Oscelola County). Images and Photographs All photographs in this guide were used with permission, and photographers are credited in each figure caption. Permission to use the photograph on the front cover, which was taken by Abhishek Mukherjee (UF/IFAS), was granted by James Cuda (UF/IFAS). Credits for the large photographs on the chapter title pages go to Lyle Buss (UF/IFAS), chapter 6; Emma Weeks (UF/IFAS), chapters 1, 2, 3, 5, and 7; and the UF/IFAS Center for Aquatic and Invasive Plants (CAIP), chapter 4. Credits for the small photographs on the chapter title pages go to Jeffrey Hill (UF/IFAS), chapter 6; Vic Ramey (UF/IFAS CAIP), chapter 2; Don Schmitz (UF/IFAS CAIP), chapter 1; Judy Shearer (U.S. Army Engineer Research and Development Center), chapter 5; Ron Slay (Florida Fish Farms), chapter 4; and Emma Weeks (UF/IFAS), chapter 3. If you wish to use or reproduce any of the photographs in this guide for educational or other purposes, you must first receive permission from the photographer. ii Hydrilla Integrated Management Contents Chapter 1: Introduction ................................................................................. 1 How to Use this Guide ................................................................................................... 2 About Hydrilla ............................................................................................................. 3 Why Can Hydrilla Be Bad for Florida’s Ecosystems? ................................................ 3 Goals of Hydrilla Management ................................................................................... 4 Integrated Pest Management (IPM) .............................................................................. 4 Developing an IPM Plan for Aquatic Weeds .............................................................. 5 PAMS IPM .................................................................................................................. 6 Summary Table: Methods for Hydrilla IPM ............................................................... 7 Selected References (IPM) ......................................................................................... 8 Chapter 2: How to Identify Hydrilla .............................................................. 9 Description of Hydrilla .................................................................................................. 10 Habitat ...................................................................................................................... 10 Plant Habit ................................................................................................................ 10 Canopy ...................................................................................................................... 10 Stems ........................................................................................................................ 12 Leaves ....................................................................................................................... 12 Turions ...................................................................................................................... 12 Flowers ..................................................................................................................... 13 Roots ......................................................................................................................... 13 Tubers ....................................................................................................................... 13 Look-alikes ................................................................................................................... 14 Canadian or Common Waterweed ........................................................................... 14 Brazilian Waterweed ................................................................................................ 14 Summary: Hydrilla Identification ................................................................................. 15 Selected References (Hydrilla Identification) ............................................................... 16 Hydrilla Integrated Management iii Chapter 3: Early Detection .......................................................................... 17 Distribution of Hydrilla in the U.S. ............................................................................... 18 List of States with Hydrilla Infestations as of 2014 .................................................. 19 Introduction and Spread in Florida ........................................................................... 19 Invasive Properties of Hydrilla ..................................................................................... 20 Early Detection and Intervention Guidelines ............................................................... 20 What to Do When You Suspect a New Infestation .................................................. 20 How to Survey for Hydrilla ....................................................................................... 21 How to Measure the Extent of an Infestation .......................................................... 21 How to Report an Invasion in Florida ...................................................................... 22 Preventing New or Recurring Hydrilla Infestations ..................................................... 22 Federal Laws and Regulations ..................................................................................... 24 Nonindigenous Aquatic Nuisance Prevention and Control Act of 1990 .................. 24 National Invasive Species Act of 1996 ..................................................................... 24 Aquatic Nuisance Species Task Force ....................................................................