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What’s Wrong with My Marijuana Plant?: A Cannabis Grower’s Visual Guide to Easy Diagnosis and Organic Remedies PDF

423 Pages·2017·67.81 MB·English
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Preview What’s Wrong with My Marijuana Plant?: A Cannabis Grower’s Visual Guide to Easy Diagnosis and Organic Remedies

Copyright © 2017 by David Deardorff and Kathryn Wadsworth All rights reserved. Published in the United States by Ten Speed Press, an imprint of the Crown Publishing Group, a division of Penguin Random House LLC, New York. www.crownpublishing.com www.tenspeed.com Ten Speed Press and the Ten Speed Press colophon are registered trademarks of Penguin Random House LLC. Library of Congress Cataloging-in-Publication Data Names: Deardorff, David C., author. | Wadsworth, Kathryn B., author. Title: What’s wrong with my marijuana plant? : a cannabis grower’s visual guide to easy diagnosis and organic remedies / David Deardorff and Kathryn Wadsworth. Description: First edition. | California ; New York : Ten Speed Press, 2017. | Includes index. Identifiers: LCCN 2017011486 Subjects: LCSH: Cannabis—Diseases and pests. | Cannabis—Diseases and pests—Control. Classification: LCC SB608.C28 D43 2017 | DDC 633.5/3—dc23 LC record available at https://lccn.loc.gov/2017011486 Trade Paperback ISBN 9780399578984 Ebook ISBN 9780399578991 Production by Howie Severson Cover design by Betsy Stromberg and George Carpenter, based on a design by Susan Applegate All photographs are by the authors except for the following: Ana Marguerite Deardorff: this page, this page, this page, this page, this page John Sanders: this page John Schneider: this page v4.1 a This book contains information on growing cannabis, which is a controlled substance in North America and throughout much of the world. As the use and cultivation of cannabis and its derivative products can carry heavy penalties, you should research your local laws before using the information in this book. Any attempt to treat an illness using cannabis should also be done under the direction of a health care professional. The authors and the publisher expressly disclaim any liability, loss, or risk, personal or otherwise, which is incurred as a consequence, directly or indirectly, of the use and application of any of the contents of this book. CONTENTS Introduction PART I—WHAT’S WRONG? VISUAL PROBLEM-SOLVING GUIDES Chapter One—Problems on the Whole Plant Chapter Two—Problems on Leaves Chapter Three—Problems on Flowers and Flower Buds Chapter Four—Problems on Stems Chapter Five—Problems on Roots Chapter Six—Problems on Seeds and Seedlings PART II—HOW DO I FIX IT? ORGANIC SOLUTIONS Chapter Seven—Change the Growing Conditions Chapter Eight—Use Biological Controls Chapter Nine—Use Organic Chemical Remedies Chapter Ten—Create Healthy Growing Conditions Chapter Eleven—Manage Nutrients Chapter Twelve—Manage Light Chapter Thirteen—Manage Water Chapter Fourteen—Manage Temperature and Humidity Chapter Fifteen—Use Proper Pruning Techniques Chapter Sixteen—Use Proper Propagation Techniques Resources Acknowledgments About the Authors Other Books by Deardorff and Wadsworth Index For researchers, patients, and families who have the courage to discover more about this remarkable plant and to seek treatment for debilitating illnesses. INTRODUCTION Whether you are a home grower with a couple of marijuana plants or a commercial grower with hundreds of plants, this book will help you diagnose problems and find solutions. Disorders (such as unhealthy growing conditions), pests, and diseases are all included here. You can treat all these problems by improving growing conditions, using biological controls, or applying safe, organic remedies. We are botanists, plant pathologists, and writers. We’ve owned nurseries and traveled the world on botanical adventures. In this book, we have compiled the most recent research to help you grow healthy cannabis. The United States government considers cannabis an illegal crop, resulting in no U.S. Department of Agriculture (USDA) guidelines, no Environmental Protection Agency (EPA) standards, and virtually no university research on acceptable treatments for pests and diseases or on the efficacy of those treatments. Research on organic cultivation of cannabis is relatively limited. To find the best organic methods, we have worked with licensed legal growers who use organic practices and we have relied on research from European sources, the Organic Materials Review Institute (OMRI), and other scientific literature. Every state in the United States that has legalized marijuana has its own statutes and guidelines. Be sure to find out what is permitted in your location, because we are not legal experts. Finally, we are not medical practitioners and have conducted no research on the medicinal attributes of marijuana. Please consult with your doctor or health care practitioner for advice on its medicinal uses. WHY USE ORGANIC GROWING TECHNIQUES? Whatever your intended use of cannabis—whether as a medicine, relaxant, mood enhancer, ritualistic practice aid, or vehicle to alter perception—you must inhale, ingest, or otherwise absorb its active ingredients. Any nonorganic, synthetic pesticide used on plants winds up inside you. Synthetic chemicals such as pesticides damage human health and the living community of which we are a part. Choose organic techniques to protect yourself and the environment. No matter where cannabis is grown, virtually no health and safety standards exist for growing it. Because it is considered illegal in many places, research is lacking and testing is not standardized. Recent media coverage has revealed that pesticide residue on marijuana is an escalating problem. Labs that have performed tests have frequently found contaminants such as pesticides and heavy metals. These pesticides include fungicide and insecticide residues at levels sixteen-hundred times higher than the legal limit for food plants. This is alarming. It just makes sense to do everything possible to eliminate this threat to the health of cannabis growers, users, and the biosphere. ABOUT CANNABIS People have cultivated cannabis for medicinal, spiritual, and recreational purposes for ten thousand years. In 2008, an archeological dig of a shaman’s grave in China revealed the earliest record of its medicinal use some twenty-seven-hundred years ago, and evidence shows that ritual use is more than four thousand years old. Recreational and mood-altering uses are likely just as ancient. The Greek historian Herodotus, writing in 440 BCE, mentions its euphoric effects in his Histories. In more modern times, people have made paper, clothing, and rope from hemp fiber and oil and milk from the seeds. Because of our relationship with this important plant, humans have carried cannabis around the globe for so long that it’s difficult

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