Herbicides

While the parent herbicides have been well documented in natural waters, relatively little is known about the occurrence of herbicide degadates in water. Those chloroacetamide degradates (the ionic ethane sulfonic acids and oxanilic acids) that have been previously studied in natural waters are found more frequently and at higher concentrations than the parent herbicide. The chloroacetamide herbicides are also known to degrade to many other neutral degradates that have not been studied extensively in natural waters.

Alphabetically arranged (by authors) "bibliography of published and unpublished literature relevant to the human health effects of 2,4-D, 2,4,5-T, PCDD, cacodylic acid, and picloram that has become available since mid-1981." Each entry gives bibliographical information, annotation, and three-letter codes indicating the general contents. No index.

In recent decades, repeated use of herbicides in the same field has imposed selection for resistance in species that were formerly susceptible. On the other hand, considerable research in the private and public sectors has been directed towards introducing herbicide tolerance into susceptible crop species. The evolution of herbicide resistance, understanding its mechanisms, characterisation of resistant weed biotypes, development of herbicide-tolerant crops and management of resistant weeds are described throughout the 36 chapters of this book. It has been written by leading researchers based on the contributions made at the International Symposium on Weed and Crop Resistance to Herbicides held at Córdoba, Spain. This book will be a good reference source for research scientists and advanced students.

A review of the most important areas of the biochemistry of herbicide action. The introductory chapter begins with the field of herbicide discovery, followed by chapters dealing with the herbicidal inhibition of photosynthesis, carotenoid biosynthesis, lipid biosynthesis, and amino acid biosynthesis. The metabolism of herbicides is discussed with particular reference to the formation of toxic components from non-toxic chemicals, and also the inactivation of toxic chemicals as a basis for selectivity. The final chapters are concerned with mechanisms of herbicide resistance in plants and the possibility of transferring resistance to susceptible crops. A glossary of the most important herbicidal chemicals mentioned in the text is included.

Over the past 50 years, triazines have made a great impact on agriculture and world hunger by assisting in the development of new farming methods, providing greater farming and land use capabilities, and increasing crop yields. Triazines are registered in over 80 countries and save billions of dollars a year. The Triazine Herbicides is the one book that presents a comprehensive view of the total science and agriculture of these chemicals. With emphasis on how the chemicals are studied and developed, reviewed, and used at the agricultural level this book provides valuable insight into the benefits of triazine herbicides for sustainable agriculture. * Presents previously unpublished information on the discovery, development and marketing of herbicides * Includes a vital section on the origin, use, economics and fate of triazine herbicides * Covers benefits of triazines in corn and sorghum, sugarcane, citrus, fruit and nut crops * Establishes best management practice and environmental benefits of use in conservation tillage

Herbicides are one of the most widely used groups of pesticides worldwide for controlling weedy species in agricultural and non-crop settings. Due to the extensive use of herbicides and their value in weed management, herbicide research remains crucial for ensuring continued effective use of herbicides while minimizing detrimental effects to ecosystems. Presently, a wide range of research continues to focus on the physiology of herbicide action, the environmental impact of herbicides, and safety. The authors of Herbicides, Physiology of Action, and Safety cover multiple topics concerning current valuable herbicide research.

This book is divided into two sections namely: synthesis and properties of herbicides and herbicidal control of weeds. Chapters 1 to 11 deal with the study of different synthetic pathways of certain herbicides and the physical and chemical properties of other synthesized herbicides. The other 14 chapters (12-25) discussed the different methods by which each herbicide controls specific weed population. The overall purpose of the book, is to show properties and characterization of herbicides, the physical and chemical properties of selected types of herbicides, and the influence of certain herbicides on soil physical and chemical properties on microflora. In addition, an evaluation of the degree of contamination of either soils and/or crops by herbicides is discussed alongside an investigation into the performance and photochemistry of herbicides and the fate of excess herbicides in soils and field crops.

Herbicides are much more than just weed killers. They may exhibit beneficial or adverse effects on other organisms. Given their toxicological, environmental but also agricultural relevance, herbicides are an interesting field of activity not only for scientists working in the field of agriculture. It seems that the investigation of herbicide-induced effects on weeds, crop plants, ecosystems, microorganisms, and higher organism requires a multidisciplinary approach. Some important aspects regarding the multisided impacts of herbicides on the living world are highlighted in this book. I am sure that the readers will find a lot of helpful information, even if they are only slightly interested in the topic.

This book presents essential research on a class of environmentally friendly alkylphosphonate herbicides. This class of herbicides acted as a competitive inhibitor of the pyruvate dehydrogenase complex (PDHc) to control weeds. The bioreasoning and systematic approach, from basic research to field tests of candidate compounds, are introduced. The basic research covers the molecular design, chemical synthesis, biological activities evaluation, structure-activity relationship analysis and structural optimization. Subsequently, the book reviews the biochemistry of PDHc inhibitors, the selectivity between mammals and plants, and the mechanism of herbicidal activity of novel alkylphosphonates as selective PDHc inhibitors. Field trials for selected alkylphosphonate candidates as herbicides are also included. This book provides a sound basis for the rational design and development of novel herbicides as effective PDHc inhibitors with good enzyme-selective inhibition of plant PDHc between mammals and plants. These studies take full advantages of the low toxicity and low residual impact of selective PHDc inhibitors to design an effective and environmentally friendly herbicide. This book is based on twenty years of research on alkylphosphonates and phosphorus-containing PDHc inhibitors, and demonstrates how to develop these PDHc inhibitors as an effective and “green” herbicide candidate. Hong-Wu He, PhD, is a Professor at the Key Laboratory of Pesticide & Chemical Biology, Ministry of Education of China, and Director of the Institute of Pesticide Chemistry, College of Chemistry, Central China Normal University, China. Hao Peng, PhD, and Xiao-Song Tan are both Associate Professors at the Key Laboratory of Pesticide & Chemical Biology, Ministry of Education of China, College of Chemistry, Central China Normal University, China.

Because plants of different species vary in the way in which they take up, transport, and metabolize chemicals in the soil, selective herbicides can be synthesized. This book examines those aspects of plant physiology, principally in crop plants, which can be affected by herbicides; the possibilities that are offered by recombinant DNA technology for developing resistance to herbicides; and methods for exploiting or preventing acquired tolerance. The author also covers recent work on ultra-selective mycoherbicides and the use of allelochemicals as herbicide substitutes.

Antidote structure - activity relationships; Comparative activity, selectivity, and field applications of herbicide antidotes; Physiological actions of thiocarbomate herbicides and their antidotes; Antiote metabolism and effects on herbicide metabolism.

This book is a study of the process by which herbicidal military policy was made in Southeast Asia. The author relates the intense controversy over the effects of the Agent Orange spraying program. He connects policy to operations, showing how pressure from scientists and disagreements within the government imposed limits on the program. He explores the technical difficulties in spraying herbicides; and he pays tribute to the Ranch Hand airmen who flew planes "low and slow" over enemy positions (altogether, Ranch Hand aircraft took over 7,000 hits). Since the 1975 renunciation of the use of herbicides, this military episode has remained unique in U.S. history. Includes notes, appendices, bibliography, and photos.