Agents for Biological Control of Purple Nutsedge, Cyperus Rotundus L PDF Download
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Author: Kenneth E. Frick
Publisher: Forgotten Books
ISBN: 9780260780096
Category :
Languages : en
Pages : 42
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Book Description
Excerpt from Agents for Biological Control of Purple Nutsedge, Cyperus Rotundus L: The Genus Bactra Stephens (Lepidoptera; Tortricidae; Olethreutinae) As a Major Source, With Emphasis on the Biology and Potential Use of Bactra Verutana Zeller Among the more widespread weeds in the world are two perennial herbs that propagate primarily by means of underground tubers. These plants are in the sedge family, Cyperaceae, and are purple nutsedge, Cyperus rotundus L., and yellow nutsedge, C. Esculentus L. Because these weeds are difficult to control, Holm et al. (1977) rated purple nutsedge as the world's worst weed and yellow nutsedge as the 16th worst. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Kenneth E. Frick
Publisher: Forgotten Books
ISBN: 9780260780096
Category :
Languages : en
Pages : 42
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Book Description
Excerpt from Agents for Biological Control of Purple Nutsedge, Cyperus Rotundus L: The Genus Bactra Stephens (Lepidoptera; Tortricidae; Olethreutinae) As a Major Source, With Emphasis on the Biology and Potential Use of Bactra Verutana Zeller Among the more widespread weeds in the world are two perennial herbs that propagate primarily by means of underground tubers. These plants are in the sedge family, Cyperaceae, and are purple nutsedge, Cyperus rotundus L., and yellow nutsedge, C. Esculentus L. Because these weeds are difficult to control, Holm et al. (1977) rated purple nutsedge as the world's worst weed and yellow nutsedge as the 16th worst. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Kenneth Eugene Frick
Publisher:
ISBN:
Category : Cyperaceae
Languages : en
Pages : 36
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Book Description
Author:
Publisher: CIAT
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
Author: Edward J. Brooks
Publisher:
ISBN:
Category : Amino acids
Languages : en
Pages : 87
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Book Description
Author: Christopher Kheng Hoe Teo
Publisher:
ISBN:
Category : Nutgrass
Languages : en
Pages : 7
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Book Description
Author: Richard Lyle Chase
Publisher:
ISBN:
Category : Nutgrass
Languages : en
Pages : 104
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Book Description
Author: James L. Faubion
Publisher:
ISBN:
Category : Nutgrass
Languages : en
Pages : 112
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
Author: A. A. L. Amerasinghe
Publisher:
ISBN:
Category : Nutgrass
Languages : en
Pages : 310
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Book Description
Purple nutsedge [Cyperus rotundas L.) has been recognized as one of the most troublesome perennial weeds of agricultural lands in tropical and some temperate regions. This research sought to determine the effects of timing of herbicides, shading, and soil moisture on plant population growth and tuber production of purple nutsedge through field and greenhouse experiments. The results of these experiments were used to validate a purple nutsedge population matrix model constructed with observed and reported data. Purple nutsedge control options were evaluated with model simulations. Glyphosate reduced shoot number, tuber number, and tuber viability of purple nutsedge, and the herbicide efficacy was higher when applied from 2 to 4 weeks after shoot emergence as compared to the first 2-week growth period. The more effective period for the herbicide coincided with the tuber initiation phase of purple nutsedge growth. Metolachlor caused only temporary suppression of purple nutsedsge. Sunlight intensity by 30%, 47%, 63%, and 90% caused in successively greater reductions in shoot number, tuber number, leaf area, and total dry weight of purple nutsedge. Shading decreased partitioning of plant biomass into tubers and increased partitioning into leaves. These responses remained essentially the same irrespective of timing of shading from early emergence through the first 4 weeks of plant growth. Depletion of available soil moisture from 25% to 75% also reduced the number and dry weights of shoots and tubers produced. However, proportional biomass allocation to shoots, leaves, and tubers and relative growth and net assimilation rates remained unaltered with soil moisture depletion, suggesting that purple nutsedge is fairly well adapted to low soil moisture levels. The importance of intraspecific competition on population regulation of purple nutsedge was evident from model simulations. Model predictions of maximum population size closely agreed with reported plant and tuber densities of purple nutsedge. Model simulations of proportional changes in population size of purple nutsedge, as influenced by soil moisture depletion or shading, also closely followed the field results. Model simulations indicated that seasonal application of herbicides resulting in 90% shoot kill will provide a successful level of control and that herbicide efficiency will be higher when shoots are killed during the second to fourth week of the growing period than from earlier applications. However, model simulations showed that a better strategy than using a highly effective, short duration herbicide is to provide a moderate level of purple nutsedge control extending through the growing season.
Author: D.O. TeBeest
Publisher: Springer Science & Business Media
ISBN: 1461596807
Category : Technology & Engineering
Languages : en
Pages : 284
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Book Description
It is appropriate at this time to reflect on two decades of research in biological control of weeds with fungal plant pathogens. Some remarkable events have occurred in the last 20 years that represent a flurry of activity far beyond what could reasonably have been predicted. In 1969 a special topics review article by C. L. Wilson was published in Annual Reviews of Phytopathology that examined the literature and the potential for biological control of weeds with plant pathogens. In that same year, experiments were conducted in Arkansas that determined whether a fungal plant pathogen could reduce the infestation of a single weed species in rice fields. In Florida a project was under way to determine the potential use of a soil-borne plant pathogen as a means for controlling a single weed species in citrus groves. Work in Australia was published that described experiments that sought to determine whether a pathogen could safely and deliberately be imported and released into a country to control a weed of agricultural importance. All three projects were successful in the sense that Puccinia chondrillina was released into Australia to control rush skeleton weed and was released later into the United States as well, and that Colletotrichum gloeosporioides f.sp. aeschynomene and Phytophthora palmivora were later both marketed for the specific purpose of controlling specific weed species.
