632.58 / S.A

Aquatic Weed Control

By

Chris Seagrave

Contents

Section “A” Weed Growth and Management Techniques

 Introduction

Function of aquatic plants in the environment

Classification of aquatic plants

Plant growth

Management strategies

 Summary of Weed Control Techniques

Mechanical – Environmental – Biological – Chemical

 Mechanical Weed Control

Handtools – Mechanical devices

 Environmental Weed Control

Control of light – Control of nutrients

 Biological Weed Control

Grass carp – Common carp - Silver carp – Crayfish

Chemical Weed Control

Role of the Regional Water Authorities

Deoxygenation – Choice of Herbicide

Susceptibility of common aquatic weeds to approved herbicides

Technical data for recommended herbicides

Safety – Conclusions

 Special Problems

Algae – Rivers

Section “B” Identification, Characteristics and Control of Common Weeds

Keys for identifying problem plants

Details of keyed species

Emergent plants – Floating-leaved plants

Submerged-leaved plants – Filamentous algae

Section “C” Appendices

 Comparative costs

Addresses of specialized equipment firms

 List of chemicals approved for use in or near water

 Water Authorities in England and Wales

 River Purification Boards and Island in Councils in Scotland

 Water Pollution control in Northern Ireland

 Other helpful bodies

Sprayers

Prep. / Ayman Ashry

Rev./ fatma Essam

Manage. / Huda Hosny