Effect of Early Exposure of Tansy Ragwort (Senecio Jacobaea) on Future Grazing Preferences of Sheep

Effect of Early Exposure of Tansy Ragwort (Senecio Jacobaea) on Future Grazing Preferences of Sheep
Author: Victor Hugo Naranjo R.
Publisher:
Total Pages: 138
Release: 1987
Genre: Senecio
ISBN:

Tansy ragwort (Senecio iacobea) is a widely distributed weed in the Pacific Northwest (U.S.A.) where it causes severe damage to the livestock industry. Sheep are highly resistant to toxic effects of ragwort, therefore, induction of ragwort preference in sheep was sought as a means to control this poisonous plant. The effect of two early exposure periods to tansy ragwort on future grazing preferences of five sheep genotypes was evaluated. Lambs were exposed at six months of age (ragwort fed fresh), and then at 15 months of age (ragwort fed as pellets). Four treatment groups were created; lambs exposed during both periods (T1), lambs exposed only during the first period (T2), lambs exposed only during the second period (T3), and lambs not exposed in either period (T4). Ragwort preferences were evaluated at 17 (Exp.l) and 19 (Exp. 2) months of age through direct grazing observation, and through plant observation before and after grazing. Experimental animals grazed in paddocks naturally infested with the weed. Results showed no treatment effects on preferences for tansy ragwort. In Exp.l consumption of the weed was so limited that comparisons were not possible between sheep genotypes nor between treatment groups. In Exp. 2 an interaction (p

Plant Toxins

Plant Toxins
Author: P. Gopalakrishnakone
Publisher:
Total Pages:
Release:
Genre: Plant toxins
ISBN: 9789400767287

Non-Chemical Weed Control

Non-Chemical Weed Control
Author: Khawar Jabran
Publisher: Academic Press
Total Pages: 174
Release: 2018-01-03
Genre: Science
ISBN: 0128098821

Non-Chemical Weed Control is the first book to present an overview of plant crop protection against non-food plants using non-chemical means. Plants growing wild—particularly unwanted plants found in cultivated ground to the exclusion of the desired crop—have been treated with herbicides and chemical treatments in the past. As concern over environmental, food and consumer safety increases, research has turned to alternatives, including the use of cover crops, thermal treatments and biotechnology to reduce and eliminate unwanted plants. This book provides insight into existing and emerging alternative crop protection methods and includes lessons learned from past methodologies. As crop production resources decline while consumer concerns over safety increase, the effective control of weeds is imperative to insure the maximum possible levels of soil, sunlight and nutrients reach the crop plants. - Allows reader to identify the most appropriate solution based on their individual use or case - Provides researchers, students and growers with current concepts regarding the use of modern, environment-friendly weed control techniques - Presents methods of weed management—an important part of integrated weed management in the future - Exploits the knowledge gained from past sustainable weed management efforts

Biological Control: Measures of Success

Biological Control: Measures of Success
Author: G. Gurr
Publisher: Springer Science & Business Media
Total Pages: 433
Release: 2012-12-06
Genre: Science
ISBN: 9401140146

As well as examining successful biological control programmes this book analyses why the majority of attempts fail. Off-target and other negative effects of biological control are also dealt with. Chapters contributed by leading international researchers and practitioners in all areas of biological control afford the book a breadth of coverage and depth of analysis not possible with a single author volume. Combined with the use of other experts to review chapters and editorial oversight to ensure thematic integrity of the volume, this book provides the most authoritative analysis of biological control published. Key aspects addressed include how success may be measured, how successful biological control has been to date and how may it be made more successful in the future. With extensive use of contemporary examples, photographs, figures and tables this book will be invaluable to advanced undergraduate and postgraduate students as well as being a `must' for all involved in making biological control successful.

Field Guide for the Biological Control of Weeds in the Northwest

Field Guide for the Biological Control of Weeds in the Northwest
Author: Rachel Winston
Publisher: Government Printing Office
Total Pages: 338
Release: 2017-12-13
Genre: Gardening
ISBN: 9780160942891

This guide focuses on the most problematic weeds in eastern North America for which there are at least some biocontrol agents established and/or available. Multiple photos and descriptions of each weed included in this guide emphasize key identification traits and plant ecology. For each weed included in this guide, all biocontrol agents released or currently found in North America are described individually. Photos highlighting key identification features and damage are included. The release history, current status, and recommended use of each biocontrol agent are described in detail. Recommendations and current impact often vary between the US and Canada, therefore, the information is presented separately. Includes international code of best practices for classical biological control of weeds.

Nutrient Requirements of Goats

Nutrient Requirements of Goats
Author:
Publisher: National Academies Press
Total Pages: 104
Release: 1981
Genre: Technology & Engineering
ISBN: 9780309031851

Each of these popular handbooks contains comprehensive information on the nutritional needs of domestic animals and includes extensive tabular data. All are paperback and 8 1/2 x 11. Some books come with diskettes or Cds that allow users to predict nutrient requirements of specific animals under various conditions and at various life stages.

Biological Control of Weeds

Biological Control of Weeds
Author: M. H. Julien
Publisher: Oxford University Press, USA
Total Pages: 244
Release: 1998
Genre: Gardening
ISBN:

Each entry details the target weed, control agent, year of first release, country of origin of agent, status and degree of control, research organisation involved, and key references. The catalogue format has been modified slightly from earlier editions to improve ease of use. The book provides an invaluable means of keeping track of the world situation, and is a handy reference for professionals, research workers and students interested in the biological control of weeds.