Effect Of Early Exposure Of Tansy Ragwort Senecio Jacobaea On Future Grazing Preferences Of Sheep
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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
Author | : P. Gopalakrishnakone |
Publisher | : |
Total Pages | : |
Release | : |
Genre | : Plant toxins |
ISBN | : 9789400767287 |
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
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.
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.
Author | : |
Publisher | : |
Total Pages | : 76 |
Release | : 1993 |
Genre | : Competition (Biology) |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2015 |
Genre | : Animal culture |
ISBN | : |
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.
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.
Author | : |
Publisher | : |
Total Pages | : 94 |
Release | : 1980 |
Genre | : Animal feeding |
ISBN | : |