<p dir="ltr">Palmer amaranth (Amaranthus palmeri S. Watts) and waterhemp [Amaranthus tuberculatus (Moq.) J. D. Sauer] are two of the most troublesome weeds in U.S. soybean production and the auxin herbicides dicamba and 2,4-D, are currently used extensively for postemergence control of these species. In some cases, complete control of weeds at the time of auxin application is not achieved due to adverse environmental conditions, plant factors or misapplications. In these instances, a subsequent postemergence herbicide may be required to control any plant that survived the initial auxin herbicide application. This research was conducted to determine the efficacy and optimal successive time interval between applications of viable postemergence herbicides in soybean on Palmer amaranth and waterhemp plants surviving a previous application of 2,4-D or dicamba. Results from this research indicated that respraying a failed auxin herbicide application with a subsequent auxin herbicide, especially dicamba, was less effective than respraying with glufosinate or fomesafen to control waterhemp in addition to being a less desirable approach for resistance management. Additionally, respray herbicide applications should target 7 to 14 d after the initial failed herbicide application on waterhemp for optimal overall efficacy. When dicamba was the initial herbicide sprayed on Palmer amaranth, 94% or greater control was achieved with glufosinate in 2019 on a 7- and 14-d respray interval, which was greater than the efficacy observed with either dicamba or 2,4-D (< 82%). In 2020, these differences in herbicide efficacy were not evident within these time intervals. These general trends in treatment differences were also manifested in the data for plant height, biomass and viable apical meristems. When 2,4-D was the initial herbicide sprayed on Palmer amaranth, fomesafen and glufosinate applications on a 7-d respray interval and glufosinate on a 14-d respray interval resulted in greater control than 2,4-D in 2019. All other trends in herbicide treatments and time intervals were consistent with dicamba applied as the initial herbicide. Another part of his research was conducted with the objective of quantifying herbicide spray solution deposition and herbicide efficacy on waterhemp growing in different densities plant densities: low, high-thinned and high densities. In both field and greenhouse experiments, spray deposition (µl cm-2) on waterhemp leaves was up to 53% less on plants grown in high density compared to the other density treatments. Even though no differences in herbicide deposition between low and the high-thinned densities were observed, there were differences in herbicide efficacy. When applied to plants growing in low density, applications of glufosinate, fomesafen and topramezone reduced weed biomass to a greater extent than plants growing in the high-thinned density. Following herbicide damage to the apical meristem, plants growing in high-density produced new branches from axillary buds that were previously dormant, whereas plants growing in the low density already had axillary branches initiated from these buds and did not provide an opportunity for new shoot growth. In general, no differences in herbicide efficacy were observed across weed densities following dicamba applications. Source-to-sink translocation of dicamba to previously active meristems, or axillary buds that broke dormancy after the herbicide application, may have compensated for less spray solution interception on plants growing in high density. Lower levels of postemergence herbicide efficacy in high density weed populations are not only influenced by spray deposition differences, but also by changes in plant growth and apical dominance. This research provides further evidence that justifies the need for weed managers to reduce weed densities as much as possible, via non-chemical or soil residual herbicides (preemergence), as much as possible to optimize the efficacy of foliar herbicide applications.</p>

<p dir="ltr">Waterhemp (<i>Amaranthus tuberculatus</i>)<i> </i>is one of the most problematic weeds in soybean production in the United States. The ability of waterhemp to quickly evolve resistance threatens the utility of many herbicides. The introduction of Xtend^®and Xtendflex^®soybeans allow for the in-season application of dicamba and glufosinate. With an increase in dicamba use in soybeans plus its continued use in corn, there have been many reports of dicamba failure on waterhemp.</p><p dir="ltr">Greenhouse dose response experiments were conducted to screen six populations of waterhemp for resistance to dicamba. Each population was compared to a known sensitive and known resistant population, with 50% growth reduction (GR₅₀) values of 39 g ae ha^-1and 226 g ae ha^-1, respectively. Low-level dicamba resistance was identified in all populations, as they had GR₅₀values that were different from the known sensitive and R:S ratios that varied from 1.7 to 4.4. Additionally, all six populations exhibited at least 50% survival at a 1/2X rate of dicamba where the sensitive only had 30% survival. Therefore, we can conclude that dicamba resistance in waterhemp is present in multiple counties in Indiana.</p><p dir="ltr">In addition to characterizing populations from Indiana, a growth monitoring study was conducted to determine how emergence timing impacted waterhemp growth. In 2021, plants that emerged in the earliest cohort were taller, had more branches, and accumulated more biomass in comparison to later emerging plants at six weeks after flagging. In 2022, drought conditions throughout the month of June impacted growth of earlier emerging plants, and waterhemp that emerged in the latest cohort were taller, had more branches, and accumulated more biomass than earlier emerging cohorts at six weeks after flagging. Seed yields per plant were low in both years, but all cohorts were able to produce seed. This research concludes that in years when soil sufficient moisture is available, earlier emerging waterhemp plants are competitive with crops and later emerging plants can still produce seed.</p><p dir="ltr">Additionally, field trials were conducted to determine herbicide programs in the Enlist^® and Xtendflex^® soybean systems that would best control a waterhemp population with multiple herbicide resistance. At 21 days after the second postemergence application, waterhemp control was highest in two pass systems. The addition of pyroxasulfone to the second postemergence application increased control of waterhemp in the Xtendflex^® system. Waterhemp densities were the lowest and soybean yield was the highest in two pass herbicide programs for both systems. The results indicate that waterhemp resistant to chemistries in HRAC Groups #2, #4, #5, #9, #14, and #27 was most effectively controlled by programs with two herbicides applications, either a preemergence followed by postemergence or two pass postemergence, and included 2,4-D and glufosinate in the postemergence application(s).</p><p dir="ltr">Finally, a waterhemp population from Francesville, IN was characterized for herbicide resistance via a series of field, greenhouse, and laboratory experiments. Preliminary laboratory analysis confirmed resistance to herbicide actives in the HRAC Groups #2 and #14 via target site mutations and to Group #9 via gene amplification. Field research trials indicated inadequate waterhemp control with preemergence applications of pendimethalin and atrazine and postemergence applications of herbicide actives from Groups #2, #9, #14, and #27 as well as glufosinate and dicamba. Greenhouse dose response experiments revealed GR₅₀values for the Francesville population that were significantly higher for dicamba, mesotrione, and topramezone than the known sensitive. R:S ratios of 4.4, 3.3, and 1.8, were documented for dicamba, mesotrione, and topramezone, respectively. Data from all experiments demonstrated that the Francesville population is resistant to herbicide actives in Groups #2, #4, #5, #9, #14, and #27.</p>

This dissertation makes an attempt to scientifically investigate Erich Sauer's theology of salvation history for the first time. Sauer grew up in a vital missionary context in the setting of the Open Brethren fellowship and the Alliance Bible School in Berlin. He studied history, philology and theology at the Humboldt University in Berlin, with the goal of promoting missions. Because of an acute eye ailment he was forced to discontinue his studies. He was invited to Wiedenest, where he found his life's work in the Bible School, which had moved in 1919. Here he worked for almost forty years as a teacher and a writer and travelling unceasingly to preach, lecture and hold biblical seminars on the topic of salvation history and missions. His theology, which is indebted to the theory of revelation history, was influenced by federal theology, theology of salvation history and the scientific, exegetic theology of German theological positivism. Sauer derives the authority of Scripture from history and develops a complex, salvation historical model, which is characterised by the classic structure of protology, soteriology and eschatology. His pre-millennial character is not dispensationally restricted, but has, rather, its own independent formation, that allows for the universal dimensions of God's completion act, without supporting a universal redemption theory. Through the high rating that he gives the position of the ecclesia in salvation history, Sauer has achieved a programmatic missions concept, which sees a missions-oriented church within every local church. With this paradigmatic theory, Sauer contributed to a revival of missions in German Brethren congregations, in conjunction with his professional colleague Schrupp. / Christian Spirituality, Church Hist and Missiology / D.Th.

This dissertation makes an attempt to scientifically investigate Erich Sauer's theology of salvation history for the first time. Sauer grew up in a vital missionary context in the setting of the Open Brethren fellowship and the Alliance Bible School in Berlin. He studied history, philology and theology at the Humboldt University in Berlin, with the goal of promoting missions. Because of an acute eye ailment he was forced to discontinue his studies. He was invited to Wiedenest, where he found his life's work in the Bible School, which had moved in 1919. Here he worked for almost forty years as a teacher and a writer and travelling unceasingly to preach, lecture and hold biblical seminars on the topic of salvation history and missions. His theology, which is indebted to the theory of revelation history, was influenced by federal theology, theology of salvation history and the scientific, exegetic theology of German theological positivism. Sauer derives the authority of Scripture from history and develops a complex, salvation historical model, which is characterised by the classic structure of protology, soteriology and eschatology. His pre-millennial character is not dispensationally restricted, but has, rather, its own independent formation, that allows for the universal dimensions of God's completion act, without supporting a universal redemption theory. Through the high rating that he gives the position of the ecclesia in salvation history, Sauer has achieved a programmatic missions concept, which sees a missions-oriented church within every local church. With this paradigmatic theory, Sauer contributed to a revival of missions in German Brethren congregations, in conjunction with his professional colleague Schrupp. / Christian Spirituality, Church Hist and Missiology / D.Th.

Thesis (DPhil (History))--University of Stellenbosch, 2010. / ENGLSIH ABSTRACT: This study is a political biography of D.F. Malan (1874–1959), the first of the apartheid-era Prime Ministers, and covers the years 1874 to 1954, when Malan retired from politics. It endeavours to provide a warts-and-all account of D.F. Malan which challenges prevalent myths and stereotypes surrounding his public persona and his political orientation. While the overwhelming focus is on Malan’s political career, special attention is paid to his personal life in order to paint a multi-faceted picture of his character. The biography is written in the form of a seamless narrative and employs a literary style of writing. It is based on archival research which utilised Malan’s private collection, as well as the private collections of his Nationalist contemporaries. Malan takes the centre stage at all times, as the biography focuses on his perceptions and experiences. Malan’s views regarding Afrikaner nationalism, which was his foremost political priority, are described, and are related to his views of British imperialism as well as other ideologies such as communism and totalitarianism. This study demonstrates that there is a notable link between Malan’s perceptions of race relations and his concerns about the poor white problem. It reveals that Malan’s racial policy was, to some extent, fluid, as were his views on South Africa’s constitutional position. Debates about South Africa’s links to Britain and the nature of the envisioned republic preoccupied Afrikaner nationalists throughout the first half of the twentieth century – and served as an outlet for regional and generational tensions within the movement. Malan’s clashes with nationalists such as Tielman Roos, J.B.M. Hertzog and J.G. Strijdom are highlighted as an indication of the internecine power struggles within the National Party (NP). By emphasising these complexities, this study seeks to contribute to a nuanced understanding of the South African past. / AFRIKAANSE OPSOMMING: Hierdie studie is politieke biografie van D.F. Malan (1874–1959), die eerste van die apartheid-era Eerste Ministers, en dek die jare 1874 tot 1954, toe Malan uit die politiek getree het. Dit poog om onversuikerde beeld van Malan te skets wat heersende mites en stereotipes aangaande sy openbare beeld en sy benadering tot die politiek uitdaag. Die fokus is hoofsaaklik op Malan se politieke loopbaan, maar besondere aandag word aan sy private lewe geskenk om sodoende veelsydige portret van sy karakter te skilder. Die biografie is in die vorm van naatlose narratief geskryf en maak van literêre skryfstyl gebruik. Dit is gebaseer op argivale navorsing, waartydens daar van D.F. Malan se privaat versameling gebruik gemaak is, sowel as die privaat versamelings van sy tydgenote. Malan is ten alle tye die sentrale figuur en die biografie fokus op sy persepsies en ervarings. Malan se denke oor Afrikaner nasionalisme, wat sy vernaamste prioriteit was, word beskryf en in verband gebring met sy opinie van Britse imperialisme, sowel as ander ideologieë soos kommunisme en totalitarisme. Die studie wys op die verband tussen Malan se denke oor rasseverhoudinge en sy besorgdheid oor die armblanke vraagstuk. Dit dui daarop dat Malan se rassebeleid tot sekere mate vloeibaar was. Dit was ook die geval met sy benadering tot Suid-Afrika se konstitusionele posisie. Afrikaner nasionaliste het tydens die eerste helfte van die twintigste eeu baie aandag geskenk aan debatte oor Suid-Afrika se verhouding tot Brittanje en die aard van die voorgenome republiek. Dit was tot mate weerligafleier vir reeds bestaande spanning tussen die onderskeie streke en generasies. Malan se botsings met nasionaliste soos Tielman Roos, J.B.M. Hertzog en J.G. Strijdom word belig as aanduiding van die diepgewortelde magstryd binne die Nasionale Party (NP). Deur op hierdie kompleksiteite klem te lê, poog die studie om bydrae te lewer tot meer genuanseerde begrip van die Suid-Afrikaanse verlede.