Guidelines For Management Of Common Ragweed Ambrosia Artemisiifolia
DOWNLOAD
Download Guidelines For Management Of Common Ragweed Ambrosia Artemisiifolia PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Guidelines For Management Of Common Ragweed Ambrosia Artemisiifolia book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Guidelines For Management Of Common Ragweed Ambrosia Artemisiifolia
DOWNLOAD
Author : Niels Holst
language : en
Publisher:
Release Date : 2009
Guidelines For Management Of Common Ragweed Ambrosia Artemisiifolia written by Niels Holst and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The Annual Ragweeds Ambrosia Artemisiifolia L Ambrosia Trifida L
DOWNLOAD
Author : Lucie Meyer
language : en
Publisher:
Release Date : 2018
The Annual Ragweeds Ambrosia Artemisiifolia L Ambrosia Trifida L written by Lucie Meyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
The first aim of this work was to investigate the risk for the evolution of resistance to acetolactate synthase inhibitor (ALS) herbicides in the common ragweed (Ambrosia artemisiifolia L.) through four points: (i) the selection pressure (effectiveness of a range of ALS inhibitor herbicides), (ii) the adaptive response of Ambrosia artemisiifolia (recurrent selection experiment), (iii) a resistance monitoring in fields in France, and (iv) the investigation of the mechanisms underlying herbicide resistance (target-site (TSR) and non-target-site resistance (NTSR) using transcriptomic analyses). The second aim was to study the connectivity of A. artemisiifolia populations in agricultural landscapes using microsatellite markers developed during this work, to determine factors that could facilitate the spread of this invasive weed species and the spread of herbicide resistance.In regards to herbicide resistance:-The sensitivity of A. artemisiifolia to ALS-inhibiting herbicides is variable between active ingredients.-Plants that survived the French maximum authorized field rate and higher rates of metsulfuron were selected to implement a recurrent breeding program. After two selection cycles, the resistance level to metsulfuron increased and resistance to imazamox and tribenuron emerged.-Three cases of imazamox resistance were identified in the field, including two cases of pure NTSR and one case of TSR - NTSR coexistence.-A transcriptome for A. artemisiifolia, AMBELbase, was generated using the PacBio sequencing technology to search for genes involved in NTSR mechanisms (RNAseq approach). 62 candidate contigs were identified including ABC transporters, cytochromes P450 and glutathione S-transferases known to be involved in the degradation of herbicides.In regards to population connectivity:-26 microsatellite markers were developed and revealed high genetic variability. Genetic structuring has been studied on a large scale for populations of A. artemisiifolia from Europe (invasion range) and North America (native range).-On a finer scale (agricultural landscape), the genetic structure of populations was influenced by colonization events. Migration events detected among the areas colonized by A. artemisiifolia suggested moderate pollen/seed flows and connectivity at the farmland scale. In agricultural environments, herbicide resistant alleles could be easily spread among neighbouring populations via pollen flow, and also at longer distances via seed dispersal. Human-related activities play a major role in the dispersal of seeds (agricultural machinery, contaminated seed lots, etc.).-The mating system analysis confirmed that A. artemisiifolia is an obligate outcrossing species which leads to important intra- and inter-population gene flow.The knowledge acquired during this work may help to foster the development of better management strategies to effectively control A. artemisiifolia to limit its spread, such as:-Diversified weed control strategies: combination of mechanical (including false-seed) and chemical weeding (diversification of herbicide modes of action).-Longer diversified crop rotations including more winter crops and/or cover and competitive crops to break the life cycle of A. artemisiifolia.These knowledge may also be used to better control of another weed species of the genus Ambrosia, Ambrosia trifida L.
Resistance Of Common Ragweed Ambrosia Artemisiifolia L To The Herbicide Linuron And Evaluation Of Several Species Of Pathogenic Fungi For Its Biological Control Microform
DOWNLOAD
Author : Sophie St-Louis
language : en
Publisher: National Library of Canada = Bibliothèque nationale du Canada
Release Date : 2000
Resistance Of Common Ragweed Ambrosia Artemisiifolia L To The Herbicide Linuron And Evaluation Of Several Species Of Pathogenic Fungi For Its Biological Control Microform written by Sophie St-Louis and has been published by National Library of Canada = Bibliothèque nationale du Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Ambrosia artemisiifolia categories.
Resistance Of Common Ragweed Ambrosia Artemisiifolia L To The Herbicide Linuron And Evaluation Of Several Species Of Pathogenic Fungi For Its Biological Control
DOWNLOAD
Author : Sophie St-Louis
language : en
Publisher:
Release Date : 2000
Resistance Of Common Ragweed Ambrosia Artemisiifolia L To The Herbicide Linuron And Evaluation Of Several Species Of Pathogenic Fungi For Its Biological Control written by Sophie St-Louis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Ambrosia artemisiifolia categories.
"Common ragweed (Ambrosia artemisiifolia L., Asteraceae) is an annual herbacious weed that is a troublesome pest in carrot fields of Southwestern Quebec. Over the past decade, ragweed has shown resistance to linuron, the only herbicide that is registered for post-emergence control of this weed in carrots. In this research, the degree of resistance to linuron was investigated for a ragweed biotype collected from a carrot field in Sherrington, Quebec, where a decreased performance of linuron had been noted. This biotype showed a linuron resistance ratio (I50) of 9.09, when compared with ragweed plants collected from a field never sprayed with this herbicide. The fungal pathogen Phoma sp., which had been initially isolated from diseased ragweed leaves in 1993, was considered as a potentially effective biological agent for the control of common ragweed. The pathogenicity of Phoma sp. was re-evaluated during the current research. This fungus was found not to have any appreciable virulence towards common ragweed; it is likely that virulence was lost during storage. Hence, twenty other fungal species were isolated from diseased common ragweed plants and assayed to determine their potential as biological agents against this noxious weed. Varying dew periods, temperatures, spore concentrations, host growth stages, and different types of carrier were evaluated. Only isolates ATT#9, INNA4a, INNA4b, ATT#10, ISO#65, and ISO#68 were able to induce lesions on ragweed foliage at spore concentrations of 106 to 107 spores ml-1, but only after an extended dew period of 48 hrs. No interaction effects on the degree of ragweed control were found when combining five fungal isolates and the insect, Ophraella communa LeSage. However, a possible interactive effect was detected when the fungal isolate ISO#65 and linuron were used in combination." --
Common Ragweed Ambrosia Artemisiifolia Systems Biology Of The Allergenic Pollen Upon Elevated No 2 Concentrations
DOWNLOAD
Author : Feng Zhao
language : en
Publisher:
Release Date : 2014
Common Ragweed Ambrosia Artemisiifolia Systems Biology Of The Allergenic Pollen Upon Elevated No 2 Concentrations written by Feng Zhao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Common Ragweed Ambrosia Artemisiifolia L Accessions In The Mid Atlantic Region Resistant To Als Ppo And Epsps Inhibiting Herbicides
DOWNLOAD
Author : Frank J. D'Amico (Jr)
language : en
Publisher:
Release Date : 2023
Common Ragweed Ambrosia Artemisiifolia L Accessions In The Mid Atlantic Region Resistant To Als Ppo And Epsps Inhibiting Herbicides written by Frank J. D'Amico (Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Common ragweed is a troublesome weed in many crops. Farmers and crop advisors in the coastal Mid-Atlantic region have reported inadequate control of common ragweed in soybean with glyphosate and herbicides with other modes of action. To determine if herbicide resistance was one of the causes in poor herbicide performance, seed was collected from twenty-nine sites where common ragweed plants survived herbicide applications and produced viable seeds. Common ragweed seedlings from those accessions were exposed to multiple rates of cloransulam, fomesafen, and glyphosate, applied as single postemergence (POST) herbicide application. All accessions except DE3 demonstrated resistance to one of the herbicides applied at a 2X rate, twenty-six accessions were 2-way resistant (glyphosate- and cloransulam-resistant) and 3-way resistance was present in eight accessions collected from three different states. In a separate study, select accessions were then treated PRE with ALS- or PPO- inhibiting herbicides. All accessions treated PRE with the ALS-inhibitors chlorimuron or cloransulam demonstrated resistance at the 2X rates. The accessions treated with the PPO-inhibitor sulfentrazone, had survivors at the 2X rate. When the same accessions were treated with fomesafen one had survivors at the 2X rate, and one had survivors at the 1X rate. Results from these tests confirmed common ragweed with 3-way resistance to POST herbicides is widespread in the region. In addition, this is the first confirmation that common ragweed accessions in the region are also resistant to ALS- or PPO- inhibiting herbicides when applied PRE.
Common Ragweed Ambrosia Artemisiifolia L
DOWNLOAD
Author : Ontario. Department of Agriculture and Food
language : en
Publisher:
Release Date : 1979
Common Ragweed Ambrosia Artemisiifolia L written by Ontario. Department of Agriculture and Food and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
Common Ragweed Ambrosia Artemisiifolia L
DOWNLOAD
Author : Ontario. Department of Agriculture
language : en
Publisher:
Release Date : 1944
Common Ragweed Ambrosia Artemisiifolia L written by Ontario. Department of Agriculture and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1944 with categories.
The Biogeography Of Common Ragweed Ambrosia Artemisiifolia L On The Macdonald College Campus And Its Application To The Species Control
DOWNLOAD
Author : Doreen Hishon
language : fr
Publisher:
Release Date : 1977
The Biogeography Of Common Ragweed Ambrosia Artemisiifolia L On The Macdonald College Campus And Its Application To The Species Control written by Doreen Hishon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Establishment And Persistence Of Common Ragweed Ambrosia Artemisiifolia L In Disturbed Soil As A Function Of An Urban Rural Macro Environment
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2006
Establishment And Persistence Of Common Ragweed Ambrosia Artemisiifolia L In Disturbed Soil As A Function Of An Urban Rural Macro Environment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
No data are available on whether rising carbon dioxide concentration [CO2] or increased air temperature can alter the establishment and persistence of common ragweed (Ambrosia artemisiifolia L.) within a plant community following soil disturbance. To determine ragweed longevity, we exposed disturbed soil with a common seed bank population to an in situ temperature and [CO2] gradient along an urban-rural transect beginning in early 2002. No other consistent differences in meteorological variables (e.g. wind speed, humidity, PAR, tropospheric ozone) as a function of urbanization were documented over the course of the study (2002-2005). Above-ground measurements of biomass over this period demonstrated that ragweed along the transect responded to urban induced increases in [CO2]/temperature with peak biomass being observed at this location by the end of 2003. However, by the Fall of 2004, and continuing through 2005, urban ragweed populations had dwindled to a few plants. The temporal decline in ragweed populations was not associated with increased disease, herbivory or auto-allelopathy, but was part of a demographic reduction in the total number of annual plant species observed for the urban location. In a separate experiment, we showed that such a demographic shift is consistent with CO2/temperature induced increases in biomass and litter accumulation, with a subsequent reduction in germination / survival of annual plant species. Overall, these data indicate that [CO2]/temperature differences associated with urbanization may increase initial ragweed productivity and pollen production, but suggest that long-term, multi-year persistence of ragweed in the urban macro-environment may be dependent on other factors.