The Impact of Sorghum Growth Stage and Resistance on Life History of Sugarcane Aphids (Hemiptera: Aphididae)

2019 ◽  
Vol 113 (2) ◽  
pp. 787-792
Author(s):  
Subin B Neupane ◽  
David L Kerns ◽  
Adrianna Szczepaniec
Keyword(s):  
Life History ◽  
Growth Stage ◽  
The United States ◽  
Growth Potential ◽  
Population Doubling ◽  
Economic Losses ◽  
Melanaphis Sacchari ◽  
Sugarcane Aphid ◽  
History Of ◽  
The Impact

Abstract Recent invasion of a new haplotype of sugarcane aphid (Melanaphis sacchari Zehntner) resulted in severe outbreaks of the aphids in sorghum (Sorghum bicolor L. Moench [Poales: Poaceae]) across the United States. Previous research and field observations suggested that both sorghum resistance and growth stage were important to their population dynamics in the field and hence effective and timely management to minimize economic losses associated with this pest. To explore this, we designed greenhouse experiments to quantify fecundity, prereproductive period, and longevity of sugarcane aphids across several vegetative and reproductive growth stages of a resistant (DKS 37-07) and susceptible (M77GB52 and DKS 38–88) sorghum hybrids commonly used in sorghum production. We found significant effects of sorghum resistance and growth stage on several life history traits and demographics parameters of sugarcane aphids. We did not, however, note any significant interactive effects of resistance and phenology on any of the response variables. Sugarcane aphids exposed to the susceptible sorghum produced significantly more offspring, had significantly greater intrinsic and finite rates of increase, and significantly shorter population doubling time than the aphids feeding on resistant sorghum. On the other hand, the impact of sorghum growth stage had more variable effects on life history of sugarcane aphids that were most frequently evident at the late reproductive stages. These outcomes support our hypothesis that sorghum in late stages of growth tends to be a better host for sugarcane aphids and highlight the importance of sorghum growth stage to sugarcane aphid life history and population growth potential.

Impact of Planting Date on Melanaphis sacchari (Hemiptera: Aphididae) Population Dynamics and Grain Sorghum Yield

2019 ◽  
Vol 112 (6) ◽  
pp. 2731-2736 ◽  
Author(s):  
Nicholas J Seiter ◽  
Anne D Miskelley ◽  
Gus M Lorenz ◽  
Neelendra K Joshi ◽  
Glenn E Studebaker ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Field Experiments ◽  
The United States ◽  
Grain Sorghum ◽  
Planting Date ◽  
Melanaphis Sacchari ◽  
Planting Dates ◽  
Sugarcane Aphid ◽  
Aphid Feeding ◽  
The Impact

Abstract The sugarcane aphid, Melanaphis sacchari (Zehntner) (Hemiptera: Aphididae), has become a major pest of grain sorghum, Sorghum bicolor (L.) Moench, in the United States in recent years. Feeding by large densities of sugarcane aphids causes severe damage, which can lead to a total loss of yield in extreme cases. Our objective was to determine the effect of grain sorghum planting date on sugarcane aphid population dynamics and their potential to reduce yields. We conducted field experiments from 2015 to 2017 in which an aphid-susceptible grain sorghum hybrid was planted at four different dates, which encompassed the typical range of planting dates used in Arkansas production systems. Plots were either protected from sugarcane aphid feeding using foliar insecticide sprays, or left untreated to allow natural populations of sugarcane aphids to colonize and reproduce freely. Planting date impacted both the magnitude and severity of sugarcane aphid infestations, with the highest population densities (and subsequent reductions in sorghum yield) generally occurring on plots that were planted in May or June. Sugarcane aphid feeding reduced yields in the untreated plots in two of the four planting date categories we tested. Earlier planting generally resulted in less sugarcane aphid damage and improved yields compared with later planting dates. While the effect of planting date on sugarcane aphid populations is likely to vary by region, sorghum producers should consider grain sorghum planting date as a potential cultural tactic to reduce the impact of sugarcane aphid.

The Man Behind the Teaching Personal and Social Responsibility Model: A Life History of Don Hellison

2020 ◽  
Vol 39 (3) ◽  
pp. 289-299 ◽  
Author(s):  
Jenn M. Jacobs ◽  
Thomas Templin
Keyword(s):  
Life History ◽  
Youth Development ◽  
Urban Youth ◽  
Academic Career ◽  
The United States ◽  
Long Time ◽  
History Of ◽  
Personal And Social Responsibility ◽  
Responsibility Model ◽  
The Impact

Don Hellison was a legend in the field of physical education and youth development and the impact he made throughout his life is immeasurable. This contribution to the monograph cannot begin to illustrate the totality of Don’s achievements throughout his life and academic career. It provides a life history of Hellison across three phases: the lone ranger, trailblazer, and icon phases that aligned with various periods and events in his life and in the United States and the world. It concludes with a statement of gratitude to Hellison for the many gifts he gave to urban youth, his students, colleagues, and importantly to his family and friends. His legacy will live on for a very long time.

Impact of the 2020 crises on the arts and culture in the United States: The effect of COVID-19 and the Black Lives Matter movement in historical context

2020 ◽  
Vol 27 (4) ◽  
pp. 449-465
Author(s):  
Stanley N. Katz ◽  
Leah Reisman
Keyword(s):  
United States ◽  
Historical Context ◽  
The United States ◽  
Cultural Organizations ◽  
Black Lives Matter ◽  
The Arts ◽  
Arts And Culture ◽  
History Of ◽  
Cultural Sector ◽  
The Impact

AbstractThis article discusses the impact of the COVID-19 pandemic and the Black Lives Matter movement on the arts and cultural sector in the United States, placing the 2020 crises in the context of the United States’s historically decentralized approach to supporting the arts and culture. After providing an overview of the United States’s private, locally focused history of arts funding, we use this historical lens to analyze the combined effects of the pandemic and Black Lives Matter movement on a single metropolitan area – Philadelphia, Pennsylvania. We trace a timeline of key events in the national and local pandemic response and the reaction of the arts community to the Black Lives Matter movement, arguing that the nature of these intersecting responses, and their fallout for the arts and cultural sector, stem directly from weaknesses in the United States’s historical approach to administering the arts. We suggest that, in the context of widespread organizational vulnerability caused by the pandemic, the United States’s decentralized approach to funding culture also undermines cultural organizations’ abilities to respond to issues of public relevance and demonstrate their civic value, threatening these organizations’ legitimacy.

scholarly journals High food insecurity in Latinx families and associated COVID-19 infection in the Greater Bay Area, California

BMC Nutrition ◽  
2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Milagro Escobar ◽  
Andrea DeCastro Mendez ◽  
Maria Romero Encinas ◽  
Sofia Villagomez ◽  
Janet M. Wojcicki
Keyword(s):  
Food Security ◽  
Food Insecurity ◽  
San Francisco ◽  
Employment Status ◽  
The United States ◽  
Household Food Security ◽  
Bay Area ◽  
Household Food ◽  
History Of ◽  
The Impact

Abstract Background Food insecurity impacts nearly one-in-four Latinx households in the United States and has been exacerbated by the novel coronavirus or COVID-19 pandemic. Methods We examined the impact of COVID-19 on household and child food security in three preexisting, longitudinal, Latinx urban cohorts in the San Francisco Bay Area (N = 375 households, 1875 individuals). Households were initially recruited during pregnancy and postpartum at Zuckerberg San Francisco General Hospital (ZSFG) and UCSF Benioff prior to the COVID-19 pandemic. For this COVID-19 sub-study, participants responded to a 15-min telephonic interview. Participants answered 18 questions from the US Food Security Food Module (US HFSSM) and questions on types of food consumption, housing and employment status, and history of COVID-19 infection as per community or hospital-based testing. Food security and insecurity levels were compared with prior year metrics. Results We found low levels of household food security in Latinx families (by cohort: 29.2%; 34.2%; 60.0%) and child food security (56.9%, 54.1%, 78.0%) with differences between cohorts explained by self-reported levels of education and employment status. Food security levels were much lower than those reported previously in two cohorts where data had been recorded from prior years. Reported history of COVID-19 infection in households was 4.8% (95% Confidence Interval (CI); 1.5–14.3%); 7.2% (95%CI, 3.6–13.9%) and 3.5% (95%CI, 1.7–7.2%) by cohort and was associated with food insecurity in the two larger cohorts (p = 0.03; p = 0.01 respectively). Conclusions Latinx families in the Bay Area with children are experiencing a sharp rise in food insecurity levels during the COVID-19 epidemic. Food insecurity, similar to other indices of poverty, is associated with increased risk for COVID-19 infection. Comprehensive interventions are needed to address food insecurity in Latinx populations and further studies are needed to better assess independent associations between household food insecurity, poor nutritional health and risk of COVID-19 infection.

scholarly journals THE LIFE-HISTORY OF THE NORTHERN MOLE-CRICKET—GRYLLOTALPA BOREALIS

1892 ◽  
Vol 24 (11) ◽  
pp. 270-273
Author(s):  
E. W. Doran
Keyword(s):  
United States ◽  
Life History ◽  
The United States ◽  
General Distribution ◽  
Mole Cricket ◽  
History Of ◽  
Time Required

Although this is a common insect in many parts of the United States, it is not generally found in great numbers in any locality, and, notwith standing its general distribution, the various staes of the insect seem not to have been describe or figured.While I am not yet able to clear up all the points in its history, I have studied the insect in all its stages, though I have not reared it from the egg to maturity, on account of the time required for it to develop—in all probability three years.

Our Rightful Place

2020 ◽  
Author(s):  
Terry L. Birdwhistell ◽  
Deirdre A. Scaggs
Keyword(s):  
Women Students ◽  
The United States ◽  
University Of Kentucky ◽  
Campus Environment ◽  
Rightful Place ◽  
Women's Culture ◽  
History Of ◽  
The 1960S ◽  
The University ◽  
The Impact

Since women first entered the University of Kentucky (UK) in 1880 they have sought, demanded, and struggled for equality within the university. The period between 1880 and 1945 at UK witnessed women’s suffrage, two world wars, and an economic depression. It was during this time that women at UK worked to take their rightful place in the university’s life prior to the modern women’s movement of the 1960s and beyond. The history of women at UK is not about women triumphant, and it remains an untidy story. After pushing for admission into a male-centric campus environment, women created women’s spaces, women’s organizations, and a women’s culture often patterned on those of men. At times, it seemed that a goal was to create a woman’s college within the larger university. However, coeducation meant that women, by necessity, competed with men academically while still navigating the evolving social norms of relationships between the sexes. Both of those paths created opportunities, challenges, and problems for women students and faculty. By taking a more women-centric view of the campus, this study shows more clearly the impact that women had over time on the culture and environment. It also allows a comparison, and perhaps a contrast, of the experiences of UK women with other public universities across the United States.

scholarly journals Tracing the cultural history of upper Snake River guides in Grand Teton National Park

2016 ◽  
Vol 39 ◽  
pp. 108-115
Author(s):  
Yolonda Youngs
Keyword(s):  
World War Ii ◽  
Cultural History ◽  
National Park ◽  
Outdoor Recreation ◽  
The United States ◽  
Snake River ◽  
World War ◽  
Grand Teton National Park ◽  
History Of ◽  
The Impact

This study traces the development and evolution of Snake River use and management through an in-depth exploration of historic commercial scenic river guiding and concessions on the upper Snake River in Grand Teton National Park (GRTE) from 1950 to the present day. The research is based on a combination of methods including archival research, oral history analysis, historical landscape analysis, and fieldwork. I suggest that a distinct cultural community of river runners and outdoor recreationalists developed in Grand Teton National Park after World War II. In GRTE, a combination of physical, cultural, and technical forces shaped this community’s evolution including the specific geomorphology and dynamic channel patterns of the upper Snake River, the individuals and groups that worked on this river, and changes in boat and gear technology over time. The following paper presents the early results from the first year of this project in 2016 including the work of a graduate student and myself. This study offers connections between the upper Snake River and Grand Teton National Park to broader national trends in the evolution of outdoor recreation and concessions in national parks, the impact of World War II on technological developments for boating, and the cultural history of adventure outdoor recreation and tourism in the United States.   Featured photo by Elton Menefee on Unsplash. https://unsplash.com/photos/AHgCFeg-gXg

scholarly journals Particularity of Canada-Mexico bilateral relations (from beginning to entry into force NAFTA Agreement)

2018 ◽  
pp. 31-41
Author(s):  
Oleh Bulka
Keyword(s):  
Trade Agreement ◽  
The United States ◽  
Mutual Cooperation ◽  
Economic Relations ◽  
The North ◽  
Bilateral Relations ◽  
Organizational Mechanism ◽  
History Of ◽  
The 1960S ◽  
The Impact

The article is devoted to the particularity of Canada-Mexico bilateral relations in the period from their beginning to signing and entry into force the North American Free Trade Agreement (NAFTA). It is noted that from the time of first contacts bilateral relations between two countries have developed unevenly with periods of increase and periods of decline. It is determined that in the history of Canada-Mexico relations before signing NAFTA can be identified four main periods. The first one is a period of early contacts that lasted from the end of XIX century to the establishment of the official diplomatic relations between Canada and Mexico in 1944. In this period of time ties between the two countries were extremely weak. The second period lasted from 1944 to the end of the 1960s. This period clearly shows the limits of cooperation between Canada and Mexico after the establishment of the official diplomatic ties, but it is also possible to see a certain coincidence between the values and diplomatic strategies of these countries. The third period of Canada-Mexico relations lasted from the beginning of the 1970s to the end of the 1980s. During this period, both Canada and Mexico try to diversify their foreign policy and strengthen the organizational mechanism of mutual cooperation. But it is also shown that despite the warm political rhetoric, there was some distance in Canada-Mexico relations. The fourth period of the relations lasted from the late 1980s until the NAFTA treaty came into force in 1994. At that time Canadian and Mexican governments began to give priority to economic relations over political and diplomatic ones. It was revealed that the main influencing factors of bilateral relations between Mexico and Canada were the impact of third countries, especially the United Kingdom and the United States, regional and global economic conditions, and the attitude to the bilateral relations of the political elites of both countries.

scholarly journals The impact of alternative rebuilding strategies to rebuild overfished stocks

2016 ◽  
Vol 73 (9) ◽  
pp. 2190-2207 ◽  
Author(s):  
Chantel R. Wetzel ◽  
André E. Punt ◽  
Keyword(s):  
West Coast ◽  
Life Histories ◽  
Estimation Error ◽  
The United States ◽  
Fish Stocks ◽  
Strategy Evaluation ◽  
The Us ◽  
History Of ◽  
The Impact ◽  
Us West

Abstract Ending overfishing and rebuilding fish stocks to levels that provide for optimum sustainable yield is a concern for fisheries management worldwide. In the United States, fisheries managers are legally mandated to end overfishing and to implement rebuilding plans for fish stocks that fall below minimum stock size thresholds. Rebuilding plans should lead to recovery to target stock sizes within 10 years, except in situations where the life history of the stock or environmental conditions dictate otherwise. Federally managed groundfish species along the US West Coast have diverse life histories where some are able to rebuild quickly from overfished status, while others, specifically rockfish (Sebastes spp.), may require decades for rebuilding. A management strategy evaluation which assumed limited estimation error was conducted to evaluate the performance of alternative strategies for rebuilding overfished stocks for these alternative US West Coast life histories. Generally, the results highlight the trade-off between the reduction of catches during rebuilding vs. the length of rebuilding. The most precautionary rebuilding plans requiring the greatest harvest reduction resulted in higher average catches over the entire projection period compared with strategies that required a longer rebuilding period with less of a reduction in rebuilding catch. Attempting to maintain a 50% probability of rebuilding was the poorest performing rebuilding strategy for all life histories, resulting in a large number of changes to the rebuilding plan, increased frequency of failing to meet rebuilding targets, and higher variation in catch. The rebuilding plans that implemented a higher initial rebuilding probability (≥60%) for determining rebuilding fishing mortality and targets generally resulted in fewer changes to the rebuilding plans and rebuilt by the target rebuilding year, particularly for stocks with the longer rebuilding plans (e.g. rockfishes).

Public Law 78: A Tangle of Domestic and International Relations

1965 ◽  
Vol 7 (4) ◽  
pp. 541-556 ◽  
Author(s):  
James F. Creagan
Keyword(s):  
United States ◽  
Migrant Workers ◽  
The United States ◽  
Public Law ◽  
United States Government ◽  
Natural Movement ◽  
Mexican Government ◽  
History Of ◽  
International Boundary ◽  
The Impact

The movement of Mexican laborers across the international boundary into the southwestern United States has been occurring since the establishment of a boundary in that area. It is a natural movement of worker toward the source of work. Interests of the governments involved have caused checks to be placed upon this movement of workers. Public Law 78 represented one of the recent attempts of the United States government, through co-operation with the Mexican government, to regulate the movement of migrant workers.In this article I will briefly trace the history of PL 78. The impact of this law upon Mexico and its relevance for United States relations with that country are of importance.

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