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Articles 571 - 586 of 586
Full-Text Articles in Weed Science
Adaptation And Utilization Of Three Legume In China, Huang Wenhui
Adaptation And Utilization Of Three Legume In China, Huang Wenhui
IGC Proceedings (1977-2023)
China is a vast territory with extremely varied climates, soil, and topography, and it is very rich in pasture grass resources. The main legumes for forage are Alfalfa (Medicago sativa L.), yellow alfalfa (Medicago folcata L.) and shadawang (Astragalis adsurgent Pall.)
Preliminary Evaluation Of Legume Germ Plasm In The Cerrados Of Brazil, D Thomas, R P. De Andrade
Preliminary Evaluation Of Legume Germ Plasm In The Cerrados Of Brazil, D Thomas, R P. De Andrade
IGC Proceedings (1977-2023)
In 1978 an evaluation program was initiated to select legumes that (1) grow and produce seed on acid soils under aluminum and water stress, (2) persist under grazing, and (3) tolerate pests and diseases. The work is being conducted at the Cerrados Agricultural Research Center, near Brasilia, at lat 15°S and altitude 1,000 to 1, 100 m . Annual rainfall is 1,500 mm, mostly distributed in a 6-month wet season, and mean annual temperature is 21°C. Nine hundred legume accessions from thirteen genera have now been established as spaced plants on the 2 major soil types of the region. The …
Genetics And Utilization Of Apomixis For The Improvement Of Guineagrass (Panicum Maximum Jacq.), Y H. Savidan
Genetics And Utilization Of Apomixis For The Improvement Of Guineagrass (Panicum Maximum Jacq.), Y H. Savidan
IGC Proceedings (1977-2023)
Natural polymorphism in guineagrass (Panicum maximumjacq.) has been stabilized in tetraploid biotypes by apomixis. Sexual diploids were found in East African populations. Our objective was to determine whether apomixis could be related with a simple genetic background and manipulated in an improvement program. Apomicts of guineagrass are characterized by a 4-nucleate embryo sac structure, and this trait was used in genetical analyses to differentiate apomictic from sexual hybrids. Progeny tests were also conducted as controls. Ten different types of progenies were analyzed: tetraploid sexual (from colchicine treatment of diploids) x apomictic F1 hybrids; selfed and backcrossed progenies of sexual F1 …
Breeding Challenges In Apomictic Warm-Season Grasses, E C. Bashaw, P W. Voigt, B L. Burson
Breeding Challenges In Apomictic Warm-Season Grasses, E C. Bashaw, P W. Voigt, B L. Burson
IGC Proceedings (1977-2023)
Efforts to breed apomictic grasses met with little success in the past, but results of more recent research show significant progress with some species and new prospects for improving apomicts. Early research uncovered the cytological basis for apospory and diplospory, found the common apomictic mechanisms in grasses, and showed that apomixis is transmitted from pannt to offspring. Discovery of sexual or partially sexual (facultative apomicts) plants in several species formerly considered obligate apomicts allowed for hybridization and genetic studies. Results of subsequent research confirmed inheritance of apomixis, and data from the more conclusive studies indicate that method of reproduction …
Distribution Mapping And Modeling Of The Invasive Japanese Knotweed, Jossalyn Rogalski
Distribution Mapping And Modeling Of The Invasive Japanese Knotweed, Jossalyn Rogalski
Masters Theses
This thesis investigates the distribution of invasive Japanese knotweed across Michigan. This plant poses significant challenges to land management due to its rapid growth, environmental impacts, and difficulty of removal once established. Using geographic information systems (GIS), remotely sensed data, and secondary environmental datasets, this research maps current infestations and analyzes key factors influencing the species’ growth and dispersal, such as soil composition, hydrology, land use, and a range of environmental variables, including climatic (annual mean temperature, temperature seasonality, annual precipitation, precipitation seasonality), elevation, vegetation and hydrological indices (NDVI, EVI, NDWI), percent tree cover, and distance to roads. Spatial analysis …
Herbivory Of Phragmites Australis Along A Salinity Gradient In Connecticut Wetlands, Sydney H. Kolz
Herbivory Of Phragmites Australis Along A Salinity Gradient In Connecticut Wetlands, Sydney H. Kolz
Honors Scholar Theses
Invasive Phragmites australis (common reed) is widely distributed in New England wetlands, where it often outcompetes native plants and decreases biodiversity throughout the food web. Controlling its invasion is a priority, especially in salt marsh habitat, but current management techniques are inefficient. Leveraging natural processes may improve control strategies, but in order to do so, we must first better understand how abiotic and biotic stressors interact and affect Phragmites. This study focuses on herbivory and salinity, two factors limiting Phragmites’ fitness. I measured soil salinity and quantified the damage of three herbivore guilds (i.e. gall-formers and stem-borers, leaf-chewers, and …
Black Medic (Medicago Lupulina) Identification And Control In Residential Landscapes, Michael Caron, Taun Beddes, Corey Ransom
Black Medic (Medicago Lupulina) Identification And Control In Residential Landscapes, Michael Caron, Taun Beddes, Corey Ransom
All Current Publications
Black medic (Medicago lupulina) is an herbaceous winter or summer annual broadleaf landscape weed. This fact sheet provides a weed description and describes suppression and control options.
Biology, Phenology, And Host Range Of A Seed-Feeding Weevil, Ceutorhynchus Constrictus (Coleoptera: Curculionidae), A Biological Control Agent For Garlic Mustard, Alliaria Petiolata, In North America, Ghislaine Cortat, Hariet L. Hinz, Esther Gerber, Elizabeth J. Katovich, Mary E. Marek-Spartz, Roger L. Becker, Robert S. Bourchier, Danielle Fife
Biology, Phenology, And Host Range Of A Seed-Feeding Weevil, Ceutorhynchus Constrictus (Coleoptera: Curculionidae), A Biological Control Agent For Garlic Mustard, Alliaria Petiolata, In North America, Ghislaine Cortat, Hariet L. Hinz, Esther Gerber, Elizabeth J. Katovich, Mary E. Marek-Spartz, Roger L. Becker, Robert S. Bourchier, Danielle Fife
The Great Lakes Entomologist
Ceutorhynchus constrictus Marsham is a seed-feeding weevil and potential biocontrol agent of the invasive plant garlic mustard, Alliaria petiolata (Bieb.) Cavara & Grande (Brassicaceae), in North America. Ceutorhynchus constrictus is native to Europe, has a single generation per year and eggs are laid into developing seeds within the seedpods of bolting garlic mustard plants. Females use their prolonged rostrum to bore holes through seedpods into the developing seed, deposit a single egg and then cover the opening with secretion. Larvae feed on ripening seeds and progress through three instars before exiting seedpods in late June, to pupate and overwinter in …
The Dual Nature Of Weedy Rice (Oryza Sativa F. Spontanea): From A Noxious Weed To An Important Genetic Resource For Rice Improvement, Rica M. Rentino, Vanessa Sernicula, May O. Palanog, Roselyn G. Alfetche, Dan Michael A. Angay, Francis L. Tejada, Dexter G. Balboa, Shaireen M. Angay, Fatima-Nasra A. Sahadain, Teodora E. Mananghaya, Karl Vincent J. Jose, Liezel C. Llanes, Jonathan M. Niones, Karla Mae R. Nonog, Frodie F. Waing, Leonilo Gramaje, Albert Christian S. Suner, Ommal H. Abdulkadi, Norvie L. Manigbas, Jose E. Hernandez, Alvin D. Palanog
The Dual Nature Of Weedy Rice (Oryza Sativa F. Spontanea): From A Noxious Weed To An Important Genetic Resource For Rice Improvement, Rica M. Rentino, Vanessa Sernicula, May O. Palanog, Roselyn G. Alfetche, Dan Michael A. Angay, Francis L. Tejada, Dexter G. Balboa, Shaireen M. Angay, Fatima-Nasra A. Sahadain, Teodora E. Mananghaya, Karl Vincent J. Jose, Liezel C. Llanes, Jonathan M. Niones, Karla Mae R. Nonog, Frodie F. Waing, Leonilo Gramaje, Albert Christian S. Suner, Ommal H. Abdulkadi, Norvie L. Manigbas, Jose E. Hernandez, Alvin D. Palanog
The Philippine Agricultural Scientist
Weedy rice (Oryza sativa f. spontanea) is becoming a serious threat to rice production in the Philippines, especially in direct-seeding rice areas, owing to its high competitiveness and its similarity to cultivated rice in morphology and ecological requirements. However, weedy rice can be considered both a threat that endangers rice production and an opportunity, as it offers a potential source of novel genes for rice improvement. This study evaluated the extent of weedy rice infestation in direct-seeding areas in the Visayas, measured the phenotypic and genotypic diversity of collected weedy rice ecotypes using simple sequence repeat (SSR) markers, and …
The Dual Nature Of Weedy Rice (Oryza Sativa F. Spontanea): From A Noxious Weed To An Important Genetic Resource For Rice Improvement, Rica M. Rentino, Vanessa Sernicula, May O. Palanog, Roselyn G. Alfetche, Dan Michael A. Angay, Francis L. Tejada, Dexter G. Balboa, Shaireen M. Angay, Fatima-Nasra A. Sahadain, Teodora E. Mananghaya, Karl Vincent J. Jose, Liezel C. Llanes, Jonathan M. Niones, Karla Mae R. Nonog, Frodie F. Waing, Leolilo Gramaje, Albert Christian S. Suner, Ommal H. Abdulkadi, Norvie L. Manigbas, Jose E. Hernandez, Alvin D. Palanog
The Dual Nature Of Weedy Rice (Oryza Sativa F. Spontanea): From A Noxious Weed To An Important Genetic Resource For Rice Improvement, Rica M. Rentino, Vanessa Sernicula, May O. Palanog, Roselyn G. Alfetche, Dan Michael A. Angay, Francis L. Tejada, Dexter G. Balboa, Shaireen M. Angay, Fatima-Nasra A. Sahadain, Teodora E. Mananghaya, Karl Vincent J. Jose, Liezel C. Llanes, Jonathan M. Niones, Karla Mae R. Nonog, Frodie F. Waing, Leolilo Gramaje, Albert Christian S. Suner, Ommal H. Abdulkadi, Norvie L. Manigbas, Jose E. Hernandez, Alvin D. Palanog
The Philippine Agricultural Scientist
Weedy rice (Oryza sativa f. spontanea) is becoming a serious threat to rice production in the Philippines, especially in direct-seeding rice areas, owing to its high competitiveness and its similarity to cultivated rice in morphology and ecological requirements. However, weedy rice can be considered both a threat that endangers rice production and an opportunity, as it offers a potential source of novel genes for rice improvement. This study evaluated the extent of weedy rice infestation in direct-seeding areas in the Visayas, measured the phenotypic and genotypic diversity of collected weedy rice ecotypes using simple sequence repeat (SSR) markers, and …
Wayne E. Sabbe Arkansas Soil Fertility Studies 2025, Nathan A. Slaton
Wayne E. Sabbe Arkansas Soil Fertility Studies 2025, Nathan A. Slaton
Arkansas Agricultural Experiment Station Research Series
Rapid technological changes in crop management and production require that the research efforts be presented in an expeditious manner. The contributions of soil fertility and fertilizers are major production factors in all Arkansas crops. The studies described within will allow producers to compare their practices with the university’s research efforts. Additionally, soil-test data and fertilizer sales are presented to allow comparisons among years, crops, and other areas within Arkansas.
A Case Study Of Suspected Sheep Losses Due To Chokecherry Not Death Camas, Kevin D. Welch, Clint A. Stonecipher, Stephen T. Lee, Daniel Cook, Benedict T. Green
A Case Study Of Suspected Sheep Losses Due To Chokecherry Not Death Camas, Kevin D. Welch, Clint A. Stonecipher, Stephen T. Lee, Daniel Cook, Benedict T. Green
Poisonous Plant Research (PPR)
Death camas (Zigadenus paniculatus) is a toxic plant often associated with poisoning cases in livestock, especially in sheep, in the spring on mountain foothills. Consequently, when sheep are found dead in mountain foothills, and death camas is present, it is often implicated as the potential cause of death. However, this may be over simplistic as there may be other plants that may also contribute to, or are the cause of, death in sheep. In this study, we present a case of approximately 200 sheep out of a band of 400 that died within 24 hours of beginning to …
An Analysis Of Systemic And Contact Herbicide Usage Trends In Illinois Corn Production Systems, Paige E. Mckittrick
An Analysis Of Systemic And Contact Herbicide Usage Trends In Illinois Corn Production Systems, Paige E. Mckittrick
Murray State Theses and Dissertations
Herbicide use is central to weed management in Illinois corn production; however, long-term changes in the balance between systemic and contact herbicides have not been well quantified at the statewide scale. This study analyzes herbicide trends in Illinois corn from 1982 to 2016 using secondary data from the USDA Agricultural Chemical Use Survey, paired with climate, regulatory, and herbicide resistance information. Herbicide active ingredients were classified into systemic and contact functional categories and grouped according to Weed Science Society of America (WSSA) mode-of-action (MOA) codes. For each survey year, total herbicide load (lb a.i./acre), functional proportions, MOA-specific contributions, and a …
Characterization Of The Genetic Diversity Of Curlyleaf Pondweed (Potamogeton Crispus L.) In The Contiguous United States And Canada And Analysis Of Possible Hybrid Potamogeton Crispus Lineages, Mallory M. Kaiser
All Graduate Theses, Dissertations, and Other Capstone Projects
Curlyleaf Pondweed (Potamogeton crispus L.) is a prolific invasive species that has spread across the United States and into parts of Canada since its introduction to North America in the 1840s. It causes extensive economic and environmental damage across its invasive range, and its control and eradication are of utmost importance to agricultural, ecological, recreational, and transportational stakeholders. Developments in molecular ecology and invasive management have found that genetic diversity and hybridization of aquatic macrophytes may affect their susceptibility to herbicide treatments, and genotype or lineage identification are important control variables that must be considered in field and …
Kentucky Bluegrass (Poa Pratensis L.) As A Perennial Groundcover: Establishment And Weed Management In Corn, Kiera S. Searcy
Kentucky Bluegrass (Poa Pratensis L.) As A Perennial Groundcover: Establishment And Weed Management In Corn, Kiera S. Searcy
Theses and Dissertations--Plant and Soil Sciences
Perennial groundcover (PGC) systems offer a cost-effective alternative to annual cover crops, by providing continuous soil cover, reducing soil erosion, and contributing to integrated weed management (IWM) in corn (Zea mays L.) production systems. Kentucky bluegrass (Poa pratensis L.) has been proposed as a perennial groundcover for corn due to its low growth habit and seasonal dormancy; however, successful adoption is limited by challenges associated with establishment-phase weed competition and compatibility with weed management programs during corn production. The objectives of this research were to (1) evaluate weed management strategies that support Kentucky bluegrass establishment and (2) assess …
A Comparative Analysis Of The Ecophysiology Between The Invasive Macroalgae Starry Stonewort And The Native Macroalgae Chara To Predict Invasion Potential, Thomas J. Zellmer
A Comparative Analysis Of The Ecophysiology Between The Invasive Macroalgae Starry Stonewort And The Native Macroalgae Chara To Predict Invasion Potential, Thomas J. Zellmer
All Graduate Theses, Dissertations, and Other Capstone Projects
Starry stonewort (Nitellopsis obtusa) is an invasive macroalga from Eurasia. Currently, starry stonewort’s invasive range consists of the upper Midwest and Great Lakes region, including the Mississippi River. Starry stonewort poses recreational and ecological problems by forming dense canopies that extend through the water column. Starry stonewort occupies a late-season niche space with dense biomass occurring in late July and persisting well into autumn. There is a lack of information on the ecophysiology of starry stonewort. In this study, two populations of starry stonewort, Minnesota and New York, were analyzed to compare regional differences in ecophysiology, along with chara (native …