scholarly journals Modeling the relationship between estimated fungicide use and disease-associated yield losses of soybean in the United States II: Seed-applied fungicides vs seedling diseases

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0244424
Author(s):  
Ananda Y. Bandara ◽  
Dilooshi K. Weerasooriya ◽  
Shawn P. Conley ◽  
Tom W. Allen ◽  
Paul D. Esker
Keyword(s):  
United States ◽  
Production Systems ◽  
Regional Scale ◽  
The United States ◽  
Annual Data ◽  
Yield Losses ◽  
Soybean Production ◽  
The Relationship ◽  
The U.S ◽  
Seedling Diseases

Use of seed-applied fungicides has become commonplace in the United States soybean production systems. Although fungicides have the potential to protect seed/seedlings from critical early stage diseases such as damping-off and root/stem rots, results from previous studies are not consistent in terms of seed-applied fungicide’s ability to mitigate yield losses. In the current study, the relationship between estimated soybean production losses due to seedling diseases and estimated seed-applied fungicide use was investigated using annual data from 28 soybean growing states in the U.S. over the period of 2006 to 2014. National, regional (northern and southern U.S.), state, and temporal scale trends were explored using mixed effects version of the regression analysis. Mixed modeling allowed computing generalized R2 values for conditional (R2GLMM(c); contains fixed and random effects) and marginal (R2GLMM(m); contains only fixed effects) models. Similar analyses were conducted to investigate how soybean production was related to fungicide use. National and regional scale modeling revealed that R2GLMM(c) values were significantly larger compared to R2GLMM(m) values, meaning fungicide use had limited utility in explaining the national/regional scale variation of yield loss and production. The state scale analysis revealed the usefulness of seed-applied fungicides to mitigate seedling diseases-associated soybean yield losses in Illinois, Indiana, North Carolina, and Ohio. Further, fungicide use positively influenced the soybean production and yield in Illinois and South Dakota. Taken together, use of seed-applied fungicide did not appear to be beneficial to many of the states. Our findings corroborate the observations made by a number of scientists through field scale seed-applied fungicide trials across the U.S and reiterate the importance of need base-use of seed-applied fungicides rather than being a routine practice in soybean production systems.

scholarly journals Modeling the relationship between estimated foliar fungicide use and soybean yield losses due to foliar fungal diseases in the United States

2019 ◽  
Author(s):  
Ananda Y. Bandara ◽  
Dilooshi K. Weerasooriya ◽  
Shawn P. Conley ◽  
Carl A. Bradley ◽  
Tom W. Allen ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Positive Phase ◽  
Yield Losses ◽  
Soybean Yield ◽  
Soybean Production ◽  
Foliar Diseases ◽  
Quadratic Curve ◽  
Foliar Fungicide ◽  
The Relationship

ABSTRACTFungicide use in the United States to manage soybean diseases has increased in recent years. The ability of fungicides to reduce disease-associated yield losses varies greatly depending on multiple factors. Nonetheless, historical data are useful to understand the broad sense and long-term trends related to fungicide use practices. In the current study, the relationship between estimated soybean yield losses due to selected foliar diseases and foliar fungicide use was investigated using annual data from 28 soybean growing states over the period of 2005 to 2015. At a national scale, a significant quadratic relationship was observed between total estimated yield losses and total fungicide use (R2 = 0.123, P < 0.0001) where yield losses initially increased, reached a plateau, and subsequently decreased with increasing fungicide use. The positive phase of the quadratic curve could be associated with insufficient amount of fungicides being used to manage targeted diseases, application of more-than-recommended prophylactic fungicides under no/low disease pressure, application of curative fungicides after economic injury level, and reduced fungicide efficacy due to a variety of factors such as unfavorable environmental conditions and resistance of targeted pathogen populations to the specific active ingredient applied. Interestingly, a significant quadratic relationship was also observed between total soybean production and total foliar fungicide use (R2= 0.36, P < 0.0001). The positive phase of the quadratic curve may suggest that factors like plant physiological changes, including increased chlorophyll content, photosynthetic rates, water use efficiency, and delayed senescence that have been widely reported to occur after application of certain foliar fungicides could have potentially contributed to enhanced yield. Therefore, the current study provides evidence of the potential usefulness of foliar fungicide applications to mitigate soybean yield losses associated with foliar diseases and their potential to positively impact soybean production/yield at national and regional scales although discrepancies to the general trends observed at national and regional scales do prevail at the local (state) level.

Relationship Between Second Life and the U.S. Economy

2010 ◽  
pp. 82-94 ◽  
Author(s):  
Rosemarie Reynolds ◽  
Yusuke Ishikawa ◽  
Amanda Macchiarella
Keyword(s):  
United States ◽  
Market Economy ◽  
Second Life ◽  
Federal Reserve ◽  
Significant Relationship ◽  
The United States ◽  
Financial Data ◽  
Goods And Services ◽  
The Relationship ◽  
The U.S

Second Life is a virtual world designed to be a free, laissez-faire market economy in which Linden Dollars are used to buy and sell goods and services. This study investigated the relationship between the economies of Second Life and the United States, using financial data collected from Linden Lab and the Federal Reserve. Partial correlation analyses were computed between two pairs of economic measures, and our results indicated that there was a significant relationship between the two economies.

scholarly journals Does wage reflect labor productivity? A comparison between Brazil and the United States

2018 ◽  
Vol 38 (4) ◽  
pp. 629-649 ◽  
Author(s):  
ALEXANDRE GORI MAIA ◽  
ARTHUR SAKAMOTO
Keyword(s):  
United States ◽  
Economic Development ◽  
Labor Productivity ◽  
Wage Differentials ◽  
The United States ◽  
Occupational Groups ◽  
Economic Cycles ◽  
Productivity Differentials ◽  
The Relationship ◽  
The U.S

ABSTRACT The study compares the relationship between wages and labor productivity for different categories of workers in Brazil and in the U.S. Analyses highlight to what extent the equilibrium between wages and productivity is related to the degree of economic development. Wages in the U.S. has shown to be more attached to labor productivity, while Brazil has experienced several economic cycles were average earnings grew initially much faster than labor productivity, suddenly falling down in the subsequent years. Analyses also stress how wage differentials, in fact, match productivity differentials for certain occupational groups, while for others they do not.

scholarly journals Modeling the relationship between estimated fungicide use and disease-associated yield losses of soybean in the United States I: Foliar fungicides vs foliar diseases

PLoS ONE ◽  
2020 ◽  
Vol 15 (6) ◽  
pp. e0234390 ◽  
Author(s):  
Ananda Y. Bandara ◽  
Dilooshi K. Weerasooriya ◽  
Shawn P. Conley ◽  
Carl A. Bradley ◽  
Tom W. Allen ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Yield Losses ◽  
Foliar Diseases ◽  
The Relationship

Effect of Diseases on Soybean Yields in the United States and Ontario (1999 to 2002)

2003 ◽  
Vol 4 (1) ◽  
pp. 24 ◽  
Author(s):  
J. A. Wrather ◽  
S. R. Koenning ◽  
T. R. Anderson
Keyword(s):  
United States ◽  
Urban Areas ◽  
The United States ◽  
Yield Losses ◽  
Soybean Yield ◽  
Rural Economies ◽  
Funding Agencies ◽  
The U.S

Soybean yields in the U.S. and Ontario have often been suppressed by diseases. The resulting losses are important to rural economies and to the economies of allied industries in urban areas. The authors compiled estimates of soybean yield losses due to diseases for each soybean producing state in the U.S. and Ontario from 1999 to 2002. The goal was to provide this information to help funding agencies and scientists prioritize research objectives and budgets. Accepted for publication 4 March 2003. Published 25 March 2003.

scholarly journals Emergence of an early SARS-CoV-2 epidemic in the United States

2021 ◽  
Author(s):  
Mark Zeller ◽  
Karthik Gangavarapu ◽  
Catelyn Anderson ◽  
Allison R. Smither ◽  
John A. Vanchiere ◽  
...  
Keyword(s):  
United States ◽  
New Orleans ◽  
Large Scale ◽  
Regional Scale ◽  
The United States ◽  
Mardi Gras ◽  
Almost All ◽  
The City ◽  
Insight Into ◽  
The U.S

AbstractThe emergence of the early COVID-19 epidemic in the United States (U.S.) went largely undetected, due to a lack of adequate testing and mitigation efforts. The city of New Orleans, Louisiana experienced one of the earliest and fastest accelerating outbreaks, coinciding with the annual Mardi Gras festival, which went ahead without precautions. To gain insight into the emergence of SARS-CoV-2 in the U.S. and how large, crowded events may have accelerated early transmission, we sequenced SARS-CoV-2 genomes during the first wave of the COVID-19 epidemic in Louisiana. We show that SARS-CoV-2 in Louisiana initially had limited sequence diversity compared to other U.S. states, and that one successful introduction of SARS-CoV-2 led to almost all of the early SARS-CoV-2 transmission in Louisiana. By analyzing mobility and genomic data, we show that SARS-CoV-2 was already present in New Orleans before Mardi Gras and that the festival dramatically accelerated transmission, eventually leading to secondary localized COVID-19 epidemics throughout the Southern U.S.. Our study provides an understanding of how superspreading during large-scale events played a key role during the early outbreak in the U.S. and can greatly accelerate COVID-19 epidemics on a local and regional scale.

With a Little Help from my Friends

2005 ◽  
Vol 38 (8) ◽  
pp. 971-999 ◽  
Author(s):  
M. Victoria Murillo ◽  
Andrew Schrank
Keyword(s):  
United States ◽  
Latin America ◽  
Latin American ◽  
Trade Unions ◽  
The United States ◽  
Labor Rights ◽  
Labor Laws ◽  
The Cost ◽  
The Relationship ◽  
The U.S

Why did Latin American governments adopt potentially costly, union-friendly labor reforms in the cost-sensitive 1980s and 1990s? The authors answer the question by exploring the relationship between trade unions and two of their most important allies: labor-backed parties at home and labor rights activists overseas. While labor-backed parties in Latin America have locked in the support of their core constituencies by adopting relatively union-friendly labor laws in an otherwise uncertain political and economic environment, labor rights activists in the United States have demonstrated their support for their Latin American allies by asking the U.S. government to treat the protection of labor rights as the price of access to the U.S. market. The former trajectory is the norm in traditionally labor-mobilizing polities, where industrialization encouraged the growth of labor-backed parties in the postwar era; the latter is more common in more labor-repressive environments, where vulnerable unions tend to look for allies overseas.

Introduction to Faith in State Legislatures

2022 ◽  
pp. 1-23
Keyword(s):  
United States ◽  
Social Change ◽  
State Legislatures ◽  
The United States ◽  
Protestant Reformation ◽  
Central Question ◽  
Politics And Culture ◽  
History Of ◽  
The Relationship ◽  
The U.S

This chapter introduces the complex history of the founding of America. Colonization of the United States was fueled by European upheaval unleashed by the Protestant Reformation. Religion in part gave birth to the United States. However, keeping religion out of government is a central question inherent in the history and culture of the U.S. The relationship among faith, politics, and culture is explored and contributes to either the support of or opposition to social change in state legislatures.

Central America and the United States: Overlooked Foreign Policy Objectives

1993 ◽  
Vol 50 (1) ◽  
pp. 1-30 ◽  
Author(s):  
Thomas M. Leonard
Keyword(s):  
United States ◽  
Foreign Policy ◽  
Central America ◽  
The United States ◽  
Economic Gain ◽  
Policy Objectives ◽  
The Relationship ◽  
The U.S

Since the fall of Nicaragua's Somoza dynasty in 1979, nearly 900 books dealing with Central America have appeared. They repeat the themes of imperialism, paternalism, and security that traditionally have characterized studies about Central America and its relations with the U.S. The imperialist theme is pursued by Walter LaFeber's Inevitable Revolutions and Karl Berman's Under the Big Stick. They assert that the United States economically exploited and politically controlled Central America in general and Nicaragua in particular. A sense of moral righteousness is found in Tom Buckley's Violent Neighbors and Richard Alan White's The Morass while the security theme is pursued by John Findling in his Close Neighbors, Distant Friends. Histories about Central America reinforce these themes. For example, the Dean of the U.S. Central Americanists Ralph Lee Woodward, Jr., and Costa Ricans Edelberto Torres-Rivas and Hector Pérez-Brignoli, and Honduran Mario Argueta demonstrate that the American businessmen capitalized upon the ignorance of region's elite for their own economic gain. Despite their diversity, all of these volumes demonstrate that the United States dominated the relationship and criticize it for so doing.

scholarly journals Christianity and Implicit Racism in the U.S. Moral and Human Economy

Open Theology ◽  
2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Bosco B. Bae
Keyword(s):  
United States ◽  
The United States ◽  
Christian Churches ◽  
Christian Morality ◽  
Implicit Racism ◽  
Human Economy ◽  
The Relationship ◽  
The U.S ◽  
Economic Responsibility

AbstractThe relationship between Christianity and racism in the United States has a long history. In an age of ‘multiculturalism’ and ‘colour-blind’ ideology, explicit forms of racism have become less conspicuous. Still, disparities arise across the country’s human economy, and explicit statements of egalitarianism are incongruent with practices of discrimination in U.S. Christian churches. This article explores this incongruence and the relationship between Christianity and implicit forms of racism. By discussing theological individualism and the principle of ‘homophily’, the article contributes to discussions about the relationship between the moral and human economy. Through this, a Christian morality of salvific aspiration is translated into a morality of personal economic responsibility and duty.

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