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Alan C York - One of the best experts on this subject based on the ideXlab platform.
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Weed Science Control of Volunteer Glyphosate-resistant Soybean in Cotton
2015Co-Authors: Alan C York, Josh B. BeamAbstract:Volunteer glyphosate-resistant (GR) soybean [Glycine max (L.) Merr.] can be a problem in GR cotton (Gossypium hirsutum L.) grown in rotation with soybean, especially when hurricanes destroy the preceding soybean crop and leave unharvested beans in the field. No-till cotton planting and lack of fluometuron applied preemergence in GR cot-ton have intensified the problem. A field experi-ment was conducted to determine GR soybean response to pyrithiobac, trifloxysulfuron, MSMA, and combinations of pyrithiobac or trifloxysulfu-ron plus MSMA applied postemergence. Trifloxy-sulfuron at 2.6 and 5.2 g a.i. ha-1 controlled GR soybean 98 and 100%, respectively, compare
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Weed Science Tropical Spiderwort (Commelina benghalensis L.) Control and Emergence Patterns in Preemergence Herbicide Systems
2015Co-Authors: Theodore M. Webster, M G Burton, Timothy L Grey, Alan C YorkAbstract:Tropical spiderwort is an exotic, invasive Weed in the southern USA that has become one of the most troublesome cotton Weeds in Georgia and Florida. Due to the continuous emergence pattern of tropical spiderwort, successful management will require a multi-component approach that includes an effective herbicide with soil residual activity. Field studies were conducted in Georgia and North Carolina to evaluate the effectiveness of several preemergence herbicides in suppressing tropical spiderwort emergence. The most effec-tive (≥80 % control) herbicides in 2002 at 6 wk after treatment (WAT) were clomazone at 0.42 and 1.05 kg ai/ha, fluometuron at 1.68 kg ai/ha
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Weed Science Flue-cured Tobacco and Peanut Response to Diuron, Fluometuron, and Prometryn Applied to a Preceding Cotton Crop
2015Co-Authors: Loren R. Fisher, Alan C York, David L. JordanAbstract:Flue-cured tobacco (Nicotiana tabacum L.) and peanut (Arachis hypogaea L.) are commonly rotated with cotton (Gossypium hirsutum L.) in North Carolina. Residual herbicides are a recommended component of a Weed resistance management strategy in glyphosate-resistant cotton; however, growers are concerned about potential adverse effects of such herbicides on rotational crops. Research was conducted at three locations in the coastal plain of North Carolina to determine the potential for the residual herbicides fluometuron, diuron, and prometryn applied to cotton to carryover to tobacco and peanut planted the following year. Treatments include
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Weed Science Pre-plant Control of Cutleaf Eveningprimrose (Oenothera laciniata Hill) and Wild Radish (Raphanus raphanistrum L.) in Conservation Tillage Cotton (Gossypium hirsutum L.)
2015Co-Authors: Scott D. Carlson, Alan C YorkAbstract:Cutleaf eveningprimrose and wild radish are problematic winter annual Weeds in cotton conser-vation tillage systems. Neither Weed is adequately controlled by glyphosate nor paraquat applied alone, so combinations with other herbicides are needed to control these Weeds prior to planting. Field experiments in Georgia during 2001 and 2002 compared cutleaf eveningprimrose and wild radish control by glyphosate or paraquat applied alone or mixed with 2,4-D, carfentrazone, dicamba, diuron, flumiclorac, flumioxazin, prometryn, tribenuron, or tribenuron plus thifensulfuron. Several combinations were effective on wild rad-ish. Glyphosate and paraquat alone controlle
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Weed Science fluridone carryover to rotational crops following application to cotton
2015Co-Authors: Charles W. Cahoon, Richard W Seagroves, Wesley J Everman, Alan C York, L. Jordan, Katherine M JenningsAbstract:There has been renewed interest in using fluridone herbicide to aid in control of glyphosateresistant Palmer amaranth (Amaranthus palmeri S. Watson) in cotton (Gossypium hirsutum L.). Section 18 Emergency Use Exemptions for fluridone in cotton have been granted recently in several states and the manufacturer is pursuing federal registration. Fluridone has long persistence in soil, leading to questions about rotational crop response. Field experiments were conducted in North Carolina to evaluate the potential for fluridone to carry over to corn (Zea mays L.), peanut (Arachis hypogaea L.), grain sorghum [Sorghum bicolor (L.) Moench.], and soybean [Glycine max (L.) Merr.] grown in rotation with fluridone-treated cotton. Fluridone at 0, 280, 420, 560, 840, and 1120 g ai ha -1 was applied preemergence to cotton and rotational crops were planted the following spring. The fluridone rates were well above proposed use rates. Only minor visible injury to cotton was observed and cotton yield was unaffected by fluridone. Fluridone also caused only minor visible injury to rotational crops and did not affect stands, early season height, or yield of rotational crops.
Javid Kashefi - One of the best experts on this subject based on the ideXlab platform.
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first report of leaf spot caused by cladosporium herbarum on centaurea solstitialis in greece
Plant Disease, 2007Co-Authors: Dana K. Berner, E L Smallwood, M B Mcmahon, Douglas G. Luster, Javid KashefiAbstract:Centaurea solstitialis L. (yellow starthistle), family Asteraceae, an invasive Weed in California and the western United States, is targeted for biological control. In the summer of 2003, an epidemic of unknown etiology on dying C. solstitialis plants was observed near Kozani, Greece (40°22′07″N, 21°52′35″E, elevation, 634 m). Plants had necrotic light brown leaf spots on the lower leaves and the decurrent leaf bases along the stems. Often, necrotic lesions extended along the stems to the capitula. Virtually all plants in a solid stand of C. solstitialis (approximately 0.5 ha) showed disease symptoms. Diseased plants were collected, air dried, and sent to the quarantine facility of the Foreign Disease-Weed Science Research Unit (FDWSRU), USDA/ARS, Fort Detrick, MD. On the basis of culture growth (45-cm diameter after 2 weeks at 25°C on malt extract agar), fungal morphology (1), and comparison with 21 internal transcribed spacer sequences in GenBank, the putative causal organism was identified as Cladospor...
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first report of leaf spot caused by a cercosporella sp on centaurea solstitialis in greece
Plant Disease, 2004Co-Authors: F M Eskandari, Dana K. Berner, Javid Kashefi, L StriethAbstract:Centaurea solstitialis L. (yellow starthistle [YST]), family Asteraceae, an invasive Weed in California and the western United States is targeted for biological control. During the spring of 2004, an epidemic of dying YST plants was found near Kozani, Greece (40°22′07″N, 21°52′35″E, 634 m elevation). Rosettes of YST had small, brown leaf spots on most of the lower leaves. In many cases, these spots coalesced and resulted in necrosis of many of the leaves and death of the rosette. Along the roadside where the disease was found, >100 of the YST plants showed disease symptoms. Diseased plants were collected, air dried, and sent to the quarantine facility of the Foreign Disease-Weed Science Research Unit (FDWSRU), USDA, ARS, Fort Detrick, MD. Diseased leaves were surface disinfested and placed on moist filter paper in petri dishes. Conidiophores and conidia were observed after 48 h. The fungal isolate, DB04-011, was isolated from these diseased leaves. Pathogenicity tests were performed by spray inoculating t...
Dana K. Berner - One of the best experts on this subject based on the ideXlab platform.
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first report of leaf spot caused by cladosporium herbarum on centaurea solstitialis in greece
Plant Disease, 2007Co-Authors: Dana K. Berner, E L Smallwood, M B Mcmahon, Douglas G. Luster, Javid KashefiAbstract:Centaurea solstitialis L. (yellow starthistle), family Asteraceae, an invasive Weed in California and the western United States, is targeted for biological control. In the summer of 2003, an epidemic of unknown etiology on dying C. solstitialis plants was observed near Kozani, Greece (40°22′07″N, 21°52′35″E, elevation, 634 m). Plants had necrotic light brown leaf spots on the lower leaves and the decurrent leaf bases along the stems. Often, necrotic lesions extended along the stems to the capitula. Virtually all plants in a solid stand of C. solstitialis (approximately 0.5 ha) showed disease symptoms. Diseased plants were collected, air dried, and sent to the quarantine facility of the Foreign Disease-Weed Science Research Unit (FDWSRU), USDA/ARS, Fort Detrick, MD. On the basis of culture growth (45-cm diameter after 2 weeks at 25°C on malt extract agar), fungal morphology (1), and comparison with 21 internal transcribed spacer sequences in GenBank, the putative causal organism was identified as Cladospor...
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first report of leaf spot caused by a cercosporella sp on centaurea solstitialis in greece
Plant Disease, 2004Co-Authors: F M Eskandari, Dana K. Berner, Javid Kashefi, L StriethAbstract:Centaurea solstitialis L. (yellow starthistle [YST]), family Asteraceae, an invasive Weed in California and the western United States is targeted for biological control. During the spring of 2004, an epidemic of dying YST plants was found near Kozani, Greece (40°22′07″N, 21°52′35″E, 634 m elevation). Rosettes of YST had small, brown leaf spots on most of the lower leaves. In many cases, these spots coalesced and resulted in necrosis of many of the leaves and death of the rosette. Along the roadside where the disease was found, >100 of the YST plants showed disease symptoms. Diseased plants were collected, air dried, and sent to the quarantine facility of the Foreign Disease-Weed Science Research Unit (FDWSRU), USDA, ARS, Fort Detrick, MD. Diseased leaves were surface disinfested and placed on moist filter paper in petri dishes. Conidiophores and conidia were observed after 48 h. The fungal isolate, DB04-011, was isolated from these diseased leaves. Pathogenicity tests were performed by spray inoculating t...
Marí, Ana Isabel - One of the best experts on this subject based on the ideXlab platform.
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Modeling the emergence of North African KnapWeed (Centaurea diluta), an increasingly troublesome Weed in Spain
'Cambridge University Press (CUP)', 2020Co-Authors: Sousa Ortega Carlos, Royo-esnal Aritz, Marí, Ana Isabel, Cordero Fernando, Vargas Manuel, Saavedra Milagros, Ditommaso Antonio, Izquierdo Figarola I Jordi, Loureiro Iñigo, Paramio, José AntonioAbstract:North African knapWeed (Centaurea diluta Aiton) is an annual Weed that is widespread in southern Spain and is of increasing concern in dryland cropping systems. Despite its expanding range in Spain, there is limited information on the emergence timing and pattern of this species, which is critical for developing more timely and effective management strategies. Therefore, there is a need to develop simple and reliable models to predict the timing and emergence of this annual Weed under dryland conditions. A multi-location field experiment was established across Spain in 2016-2017 to assess the emergence of C. diluta. At each of 11 locations, seeds were sown in the fall, and emergence was recorded. Overall emergence averaged 39% in the first year across all sites and 11% in the second year. In both years, the main emergence flush occurred at beginning of the growing season. The three-parameter Weibull function best described seedling emergence of C. diluta. Emergence models were developed based on thermal time (TT) and hydrothermal time (HTT) and showed high predictability, as evidenced by root mean square error prediction (RMSEP) values of 10.8 and 10.7, respectively. The three cardinal points were established for TT and HHT at 0.5 ºC, 10 ºC and 35 ºC for base, optimal and ceiling temperature, while base water potential was estimated at -0.5MPa.We would like to thank Cátedra Adama and the Spanish Weed Science Society (SEMh) for providing financial support for this project. We are grateful to the many students and technicians who assisted with field work at the different experimental locations. We would like to thank the Spanish Goverment for partial funding, through project AVA 2019.020 "Advances in Technological Research in Winter Cereals: Genetic Improvement and Sustainable Management" financed with FEDER funds (80%). Also, Joel Torra acknowledges support from the Spanish Ministry of Science, Innovation and Universities (grant Ramon y Cajal RYC2018-023866-I)
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Biology and Agroecology Group of the Spanish Weed Science Society (SEMh): emergence and growth of Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum
Universidad Pública de Navarra Nafarroako Unibertsitate Publikoa, 2017Co-Authors: Royo-esnal Aritz, Escorial, María Concepción, Marí, Ana Isabel, Cordero Fernando, Vargas Manuel, Saavedra Milagros, Lezáun, Juan Antonio, Paramio, José Antonio, Sousa Carlos, Izquierdo JordiAbstract:Comunicación presentada al XVI Congreso de la Sociedad Española de Malherbología, celebrado en la Universidad Pública de Navarra entre los días 25 y 27 de octubre de 2017.En este trabajo presentamos los primeros resultados de emergencia de cinco especies malas hierbas preocupantes en España: Avena sterilis L., Centaurea diluta Ait., Chrysanthemum segetum L., Lolium rigidum G. y Ridolfia segetum L. Se sembraron semillas de estas especies en 13 localidades diferentes distribuidas por toda España. Para cada especie se utilizaron 100 semillas y hubo cuatro repeticiones. La siembra se realizó tras remover el suelo de 0 a 2 cm de profundidad, salvo en A. sterilis (de 0 a 10 cm), en marcos de plantación divididos en seis celdas, uno de testigo, de 0,25 × 0,25 m2. Se realizaron muestreos de emergencia en intervalos de entre 2 y 7 días. Los resultados muestran que las especies más precoces fueron C. diluta y L. rigidum, seguidas por A. sterilis. Estas tres especies fueron también las que presentaron mayores porcentajes de emergencia.In the present work the results of the emergence of five worrying Weed species in Spain are presented: Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum. Seeds of each species were sown in 13 locations distributed throughout Spain. For each species 100 seeds were sown disturbing the soil down to 2 cm (10 cm for A. sterilis) in planting marks divided in six 0.25 × 0.25 m2 cells, with four replications. Samplings were performed every 2-7 days. The results show that C. diluta and L. rigidum, followed by A. sterilis, were the first emerging species. These three species were also those which showed higher emergence percentages.Este proyecto ha sido financiado por la Cátedra Adama de la Universidad de Sevilla y por la Sociedad Española de Malherbología
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Biology and Agroecology Group of the Spanish Weed Science Society (SEMh): emergence and growth of Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum
Universidad Publica de Navarra. Biblioteca, 2017Co-Authors: Royo Esnal A., Escorial, María Concepción, Marí, Ana Isabel, Cordero Fernando, Urbano Fuentes-guerra, José María, Royuela Hernando MercedesAbstract:In the present work the results of the emergence of five worrying Weed species in Spain are presented: Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum. Seeds of each species were sown in 13 locations distributed throughout Spain. For each species 100 seeds were sown disturbing the soil down to 2 cm (10 cm for A. sterilis) in planting marks divided in six 0.25 × 0.25 m2 cells, with four replications. Samplings were performed every 2-7 days. The results show that C. diluta and L. rigidum, followed by A. sterilis, were the first emerging species. These three species were also those which showed higher emergence percentagesEn este trabajo presentamos los primeros resultados de emergencia de cinco especies malas hierbas preocupantes en España: Avena sterilis L., Centaurea diluta Ait., Chrysanthemum segetum L., Lolium rigidum G. y Ridolfia segetum L. Se sembraron semillas de estas especies en 13 localidades diferentes distribuidas por toda España. Para cada especie se utilizaron 100 semillas y hubo cuatro repeticiones. La siembra se realizó tras remover el suelo de 0 a 2 cm de profundidad, salvo en A. sterilis (de 0 a 10 cm), en marcos de plantación divididos en seis celdas, uno de testigo, de 0,25 × 0,25 m2. Se realizaron muestreos de emergencia en intervalos de entre 2 y 7 días. Los resultados muestran que las especies más precoces fueron C. diluta y L. rigidum, seguidas por A. sterilis. Estas tres especies fueron también las que presentaron mayores porcentajes de emergenci
Cordero Fernando - One of the best experts on this subject based on the ideXlab platform.
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Modeling the emergence of North African KnapWeed (Centaurea diluta), an increasingly troublesome Weed in Spain
'Cambridge University Press (CUP)', 2020Co-Authors: Sousa Ortega Carlos, Royo-esnal Aritz, Marí, Ana Isabel, Cordero Fernando, Vargas Manuel, Saavedra Milagros, Ditommaso Antonio, Izquierdo Figarola I Jordi, Loureiro Iñigo, Paramio, José AntonioAbstract:North African knapWeed (Centaurea diluta Aiton) is an annual Weed that is widespread in southern Spain and is of increasing concern in dryland cropping systems. Despite its expanding range in Spain, there is limited information on the emergence timing and pattern of this species, which is critical for developing more timely and effective management strategies. Therefore, there is a need to develop simple and reliable models to predict the timing and emergence of this annual Weed under dryland conditions. A multi-location field experiment was established across Spain in 2016-2017 to assess the emergence of C. diluta. At each of 11 locations, seeds were sown in the fall, and emergence was recorded. Overall emergence averaged 39% in the first year across all sites and 11% in the second year. In both years, the main emergence flush occurred at beginning of the growing season. The three-parameter Weibull function best described seedling emergence of C. diluta. Emergence models were developed based on thermal time (TT) and hydrothermal time (HTT) and showed high predictability, as evidenced by root mean square error prediction (RMSEP) values of 10.8 and 10.7, respectively. The three cardinal points were established for TT and HHT at 0.5 ºC, 10 ºC and 35 ºC for base, optimal and ceiling temperature, while base water potential was estimated at -0.5MPa.We would like to thank Cátedra Adama and the Spanish Weed Science Society (SEMh) for providing financial support for this project. We are grateful to the many students and technicians who assisted with field work at the different experimental locations. We would like to thank the Spanish Goverment for partial funding, through project AVA 2019.020 "Advances in Technological Research in Winter Cereals: Genetic Improvement and Sustainable Management" financed with FEDER funds (80%). Also, Joel Torra acknowledges support from the Spanish Ministry of Science, Innovation and Universities (grant Ramon y Cajal RYC2018-023866-I)
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Biology and Agroecology Group of the Spanish Weed Science Society (SEMh): emergence and growth of Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum
Universidad Pública de Navarra Nafarroako Unibertsitate Publikoa, 2017Co-Authors: Royo-esnal Aritz, Escorial, María Concepción, Marí, Ana Isabel, Cordero Fernando, Vargas Manuel, Saavedra Milagros, Lezáun, Juan Antonio, Paramio, José Antonio, Sousa Carlos, Izquierdo JordiAbstract:Comunicación presentada al XVI Congreso de la Sociedad Española de Malherbología, celebrado en la Universidad Pública de Navarra entre los días 25 y 27 de octubre de 2017.En este trabajo presentamos los primeros resultados de emergencia de cinco especies malas hierbas preocupantes en España: Avena sterilis L., Centaurea diluta Ait., Chrysanthemum segetum L., Lolium rigidum G. y Ridolfia segetum L. Se sembraron semillas de estas especies en 13 localidades diferentes distribuidas por toda España. Para cada especie se utilizaron 100 semillas y hubo cuatro repeticiones. La siembra se realizó tras remover el suelo de 0 a 2 cm de profundidad, salvo en A. sterilis (de 0 a 10 cm), en marcos de plantación divididos en seis celdas, uno de testigo, de 0,25 × 0,25 m2. Se realizaron muestreos de emergencia en intervalos de entre 2 y 7 días. Los resultados muestran que las especies más precoces fueron C. diluta y L. rigidum, seguidas por A. sterilis. Estas tres especies fueron también las que presentaron mayores porcentajes de emergencia.In the present work the results of the emergence of five worrying Weed species in Spain are presented: Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum. Seeds of each species were sown in 13 locations distributed throughout Spain. For each species 100 seeds were sown disturbing the soil down to 2 cm (10 cm for A. sterilis) in planting marks divided in six 0.25 × 0.25 m2 cells, with four replications. Samplings were performed every 2-7 days. The results show that C. diluta and L. rigidum, followed by A. sterilis, were the first emerging species. These three species were also those which showed higher emergence percentages.Este proyecto ha sido financiado por la Cátedra Adama de la Universidad de Sevilla y por la Sociedad Española de Malherbología
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Biology and Agroecology Group of the Spanish Weed Science Society (SEMh): emergence and growth of Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum
Universidad Publica de Navarra. Biblioteca, 2017Co-Authors: Royo Esnal A., Escorial, María Concepción, Marí, Ana Isabel, Cordero Fernando, Urbano Fuentes-guerra, José María, Royuela Hernando MercedesAbstract:In the present work the results of the emergence of five worrying Weed species in Spain are presented: Avena sterilis, Centaurea diluta, Chrysanthemum segetum, Lolium rigidum and Ridolfia segetum. Seeds of each species were sown in 13 locations distributed throughout Spain. For each species 100 seeds were sown disturbing the soil down to 2 cm (10 cm for A. sterilis) in planting marks divided in six 0.25 × 0.25 m2 cells, with four replications. Samplings were performed every 2-7 days. The results show that C. diluta and L. rigidum, followed by A. sterilis, were the first emerging species. These three species were also those which showed higher emergence percentagesEn este trabajo presentamos los primeros resultados de emergencia de cinco especies malas hierbas preocupantes en España: Avena sterilis L., Centaurea diluta Ait., Chrysanthemum segetum L., Lolium rigidum G. y Ridolfia segetum L. Se sembraron semillas de estas especies en 13 localidades diferentes distribuidas por toda España. Para cada especie se utilizaron 100 semillas y hubo cuatro repeticiones. La siembra se realizó tras remover el suelo de 0 a 2 cm de profundidad, salvo en A. sterilis (de 0 a 10 cm), en marcos de plantación divididos en seis celdas, uno de testigo, de 0,25 × 0,25 m2. Se realizaron muestreos de emergencia en intervalos de entre 2 y 7 días. Los resultados muestran que las especies más precoces fueron C. diluta y L. rigidum, seguidas por A. sterilis. Estas tres especies fueron también las que presentaron mayores porcentajes de emergenci
