Evaluation of fungicide efficacy on sunflower rust (Puccinia helianthi) on oilseed and confection sunflower

2021 ◽  
Author(s):  
Brandt Berghuis ◽  
Andrew Friskop ◽  
Michelle Gilley ◽  
Jessica Halvorson ◽  
Bryan Hansen ◽  
...  
Keyword(s):  
Great Plains ◽  
Field Experiments ◽  
Field Trials ◽  
Northern Great Plains ◽  
Puccinia Helianthi ◽  
Action Threshold ◽  
The Us ◽  
Fungicide Efficacy ◽  
Rust Severity ◽  
Important Disease

Sunflower rust, caused by Puccinia helianthi, is an economically and globally important disease of sunflower. Two types of sunflowers are produced in the US Northern Great Plains; the oilseed type and the confection type. Although approximately 80% of the acreage in this region is planted as the oilseed type sunflower, fungicide efficacy and timing studies have been conducted primarily on the more rust-susceptible confection type. A total of ten sunflower rust efficacy field experiments were conducted on oilseed type and confectionary type hybrid trials from 2016-2018. Eleven fungicides from three FRAC groups were evaluated for efficacy and protection of yield. Severity differences among fungicide treatments were identified in both confection and oilseed type sunflower trials. A combined analysis of all confection field trials (five) indicated that rust severity was lower in all fungicide treatments as compared to the non-treated control. Despite rust severity levels below the fungicide action threshold for confection sunflower, seven of the eleven fungicide treatments had yield higher than the non-treated control. In oilseed trials, rust severity was lower in all fungicide treatments as compared to the non-treated control, similar to the findings of the confection type. Rust severity was too low to detect yield differences in oilseed trials. Additional work is needed to elucidate yield-loss potential on oilseed type sunflower and refine the fungicide action threshold on confection type sunflower.

scholarly journals Regional uptake and release of crop carbon in the United States

2011 ◽  
Vol 8 (8) ◽  
pp. 2037-2046 ◽  
Author(s):  
T. O. West ◽  
V. Bandaru ◽  
C. C. Brandt ◽  
A. E. Schuh ◽  
S. M. Ogle
Keyword(s):  
Great Plains ◽  
Carbon Budget ◽  
Supply And Demand ◽  
The United States ◽  
Northern Great Plains ◽  
Agricultural Crops ◽  
Biomass Storage ◽  
The Us ◽  
Import And Export ◽  
Crop Biomass

Abstract. Carbon fixed by agricultural crops in the US creates regional CO2 sinks where it is harvested and regional CO2 sources where it is released back to the atmosphere. The quantity and location of these fluxes differ depending on the annual supply and demand of crop commodities. Data on the harvest of crop biomass, storage, import and export, and on the use of biomass for food, feed, fiber, and fuel were compiled to estimate an annual crop carbon budget for 2000 to 2008. With respect to US Farm Resource Regions, net sources of CO2 associated with the consumption of crop commodities occurred in the Eastern Uplands, Southern Seaboard, and Fruitful Rim regions. Net sinks associated with the production of crop commodities occurred in the Heartland, Northern Great Plains, and Mississippi Portal regions. The national crop carbon budget was balanced to within 0.3 to 6.1 % yr−1 during the period of this analysis.

Performance of nitrate compared with urea fertilizer in a semiarid climate of the northern Great Plains

2019 ◽  
Vol 99 (3) ◽  
pp. 345-355
Author(s):  
Richard E. Engel ◽  
Carlos M. Romero ◽  
Patrick Carr ◽  
Jessica A. Torrion
Keyword(s):  
Grain Yield ◽  
Great Plains ◽  
N Uptake ◽  
Triticum Aestivum L ◽  
Field Trials ◽  
Northern Great Plains ◽  
N Recovery ◽  
Fertilizer N ◽  
Total N ◽  
Semiarid Regions

Fertilizer NO3-N may represent a benefit over NH4-N containing sources in semiarid regions where rainfall is often not sufficient to leach fertilizer-N out of crop rooting zones, denitrification concerns are not great, and when NH3 volatilization concerns exist. The objective of our study was to contrast plant-N derived from fertilizer-15N (15Ndff), fertilizer-15N recovery (F15NR), total N uptake, grain yield, and protein of wheat (Triticum aestivum L.) from spring-applied NaNO3 relative to urea and urea augmented with urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT). We established six fertilizer-N field trials widespread within the state of Montana between 2012 and 2017. The trials incorporated different experimental designs and 15N-labeled fertilizer-N sources, including NaNO3, NH4NO3, urea, and urea + NBPT. Overall, F15NR and 15Ndff in mature crop biomass were significantly greater for NaNO3 than urea or urea + NBPT (P < 0.05). Crop 15Ndff averaged 53.8%, 43.9%, and 44.7% across locations for NaNO3, urea, and urea + NBPT, respectively. Likewise, crop F15NR averaged 52.2%, 35.8%, and 38.6% for NaNO3, urea, and urea + NBPT, respectively. Soil 15N recovered in the surface layer (0–15 cm) was lower for NaNO3 compared with urea and urea + NBPT. Wheat grain yield and protein were generally not sensitive to improvements in 15Ndff, F15NR, or total N uptake. Our study hypothesis that NaNO3 would result in similar or better performance than urea or urea + NBPT was confirmed. Use of NO3-N fertilizer might be an alternative strategy to mitigate fertilizer-N induced soil acidity in semiarid regions of the northern Great Plains.

Effect of Kochia (Kochia scoparia) Interference on Sunflower (Helianthus annuus) Yield

Weed Science ◽  
2014 ◽  
Vol 62 (1) ◽  
pp. 158-165 ◽  
Author(s):  
Derek W. Lewis ◽  
Robert H. Gulden
Keyword(s):  
Great Plains ◽  
Growth And Development ◽  
Seed Quality ◽  
Seedling Recruitment ◽  
Soil Surface ◽  
Northern Great Plains ◽  
Limited Information ◽  
Leaf Stage ◽  
Action Threshold ◽  
Sunflower Crop

Kochia is a weed found in many sunflower fields across the Northern Great Plains. There is limited information about the ability of sunflower plants to compete with kochia, specifically when the weed grows both in the crop row and in the inter-row space, as in zero tillage systems that rely solely on herbicides to manage weeds. An experiment was conducted over seven site–yr, from 2009 to 2011, to determine the effect of kochia density and relative time of kochia seedling recruitment on sunflower growth and development, yield and seed quality. Kochia seed was broadcast on the soil surface at six densities, into sunflowers planted in 75-cm rows, either at the same time as the sunflower crop was planted (early weed seedling recruitment), or when the sunflowers were at the four-leaf stage (late weed seedling recruitment). When kochia plants emerged at the same time as the sunflowers, yield was reduced by up to 76% and sunflower head diam was reduced in four site–yr, stem diam was reduced in three site–yr, height was reduced in two site–yr and the number of leaves per sunflower plant was reduced in two site–yr The 5% action threshold for early emerging kochia was four kochia plants m−2in the combined site–yr analysis. Additionally, early recruiting kochia seedlings reduced sunflower seed size and seed weight at two and three site–yr, respectively. Kochia plants that emerged after the four-leaf stage of the sunflower crop did not affect sunflower growth and development, yield, or seed quality. To reduce the potential for yield and seed quality losses, sunflower growers should be proactive with respect to managing kochia in sunflowers, particularly when the kochia plants emerge at about the same time as the sunflowers.

Impact of tillage on field pea following spring wheat

2009 ◽  
Vol 89 (2) ◽  
pp. 281-288 ◽  
Author(s):  
P. M. Carr ◽  
G. B. Martin ◽  
R. D. Horsley
Keyword(s):  
Great Plains ◽  
Seed Yield ◽  
Spring Wheat ◽  
Water Conservation ◽  
Cropping System ◽  
Field Pea ◽  
Northern Great Plains ◽  
N Fixation ◽  
The Us ◽  
The Impact

Tillage is being reduced in semiarid regions. The impact of changing tillage practices on field pea (Pisum sativum L.) performance has not been considered in a major pea-producing area within the US northern Great Plains. A study was conducted from 2000 through 2005 to determine how field pea performance compared following spring wheat (Triticum aestivum L.) in clean-till (CT), reduced-till (RT), and no-till (NT) systems arranged in a randomized complete block at Dickinson in southwestern North Dakota. Seed yield increased over 1600 kg ha-1 in 2000 and almost 400 kg ha-1 in 2003 under NT compared with CT, and by 960 kg ha-1 in 2000 under NT compared with RT (P < 0.05). Differences in seed yield were not detected between tillage systems in other years. Plant establishment was improved as tillage was reduced, averaging 66 plants m-2 under NT and RT compared with 60 plants m-2 under CT management. The soil water conservation that can occur after adopting NT may explain the increased seed yields that occurred in some years. These results suggest that field pea seed yield can be increased by eliminating tillage in semiarid areas of the US northern Great Plains, particularly when dry conditions develop and persist. Key words: Zero tillage, field pea, cropping system, N-fixation, legume

scholarly journals Effect of green manure crops, termination method, stubble crops, and fallow on soil water, available N, and exchangeable P

2016 ◽  
Vol 96 (5) ◽  
pp. 867-886 ◽  
Author(s):  
S.P. Mooleki ◽  
Y. Gan ◽  
R.L. Lemke ◽  
R.P. Zentner ◽  
C. Hamel
Keyword(s):  
Great Plains ◽  
Green Manure ◽  
Field Experiments ◽  
Northern Great Plains ◽  
Available N ◽  
Sustainable Agricultural Systems ◽  
Lathyrus Sativus L ◽  
Nitrogen Phosphorus ◽  
Green Manure Crops ◽  
Exchangeable P

Green manure crops may have a role to play in the development of sustainable agricultural systems in the semiarid northern Great Plains of North America. This study determined the benefits of different green manure crops, seeding dates, and termination methods on soil nitrogen, phosphorus, and moisture, as well as the performance of durum wheat following green manures the following year. Field experiments were conducted at Swift Current, Saskatchewan, from 2006 to 2009. Three green manure crops [forage pea (Pisum sativum L.), chickling vetch (Lathyrus sativus L.), and black lentil (Lens culinaris Medik.)] were seeded in May, June, and July, and terminated at full bloom using glyphosate, rototilling or by frost. Other treatments included summerfallow and stubble of selected crops harvested for grain or silage. Different green manure crops, seeding dates or termination methods had similar effects on soil moisture, available N, and exchangeable P at termination or the following spring. These effects of green manure management on soil residual characteristics were comparable to those observed under summerfallow, but higher than those on grain or silage stubble. Therefore, green manure is a viable alternative to summerfallowing and could be seeded any time during the growing season. If seeded late, green manure could be terminated by frost, thus saving on costs.

Naming Violence in United States Colonialism

2019 ◽  
Vol 53 (1) ◽  
pp. 157-193
Author(s):  
Taylor Spence
Keyword(s):  
United States ◽  
Sexual Violence ◽  
Great Plains ◽  
Northern Great Plains ◽  
The Us ◽  
Us Government ◽  
History Of ◽  
Nineteenth Century United States ◽  
Cover Up

Abstract This article reexamines a highly public dispute between a powerful and well-connected Episcopal bishop and his missionary priest, men both central to the government’s campaign of war and assimilation against Indigenous Peoples in the Northern Great Plains of the nineteenth-century United States. The bishop claimed that the priest had engaged in sexual intercourse with a Dakota woman named “Scarlet House,” and used this allegation to remove the priest from his post. No historian ever challenged this claim and asked who Scarlet House was. Employing Dakota-resourced evidence, government and church records, linguistics, and onomastics, this study reveals that in actuality there was no such person as Scarlet House. Furthermore, at the time of the incident, the person in question was not a woman but a child. The church created a fictional personage to cover up what was taking place at the agency: sexual violence against children. After “naming” this violence, this article makes four key historical contributions about the history of US settler colonialism: It documents Dakota Peoples’ agency, by demonstrating how they adapted their social structures to the harrowing conditions of the US mission and agency system. It situates the experiences of two Dakota families within the larger context of settler-colonial conquest in North America, revealing the generational quality of settler-colonial violence. It shows how US governmental policies actually enabled sexual predation against children and women. And, it argues that “naming violence” means both rendering a historical account of the sexual violence experienced by children and families in the care of the US government and its agents, as well as acknowledging how this violence has rippled out through communities and across generations.

Response of Chickpea Cultivars to Imidazolinone Herbicide Applied at Different Growth Stages

2016 ◽  
Vol 30 (3) ◽  
pp. 664-676 ◽  
Author(s):  
M. Laura Jefferies ◽  
Christian J. Willenborg ◽  
Bunyamin Tar'an
Keyword(s):  
Great Plains ◽  
Growth Stage ◽  
Field Experiments ◽  
Northern Great Plains ◽  
Yield Reduction ◽  
Growth Stages ◽  
Resistant Cultivars ◽  
Node Development ◽  
Different Growth Stages ◽  
Chickpea Cultivars

POST broadleaf weed control options in chickpea are very limited on the Northern Great Plains. Field experiments were conducted in 2012 and 2013 in Saskatchewan to evaluate the response of chickpea cultivars to imidazolinone (IMI) herbicides applied at different growth stages. Conventional cultivars ‘CDC Luna’ and ‘CDC Corinne’ were compared with IMI-resistant cultivars ‘CDC Alma’ and ‘CDC Cory’. Treatments comprised a combination of imazethapyr + imazamox herbicides at 30 and 60 g ai ha−1(1× and 2× rates, respectively) applied at the 2 to 4-, 5 to 8-, and 9 to 12-node growth stages. Visual injury estimates were > 50% for CDC Luna and CDC Corinne for all growth stage applications. Conventional cultivars also experienced height reduction and decreased rate of node development compared with the nontreated controls. Flowering and maturity of CDC Luna and CDC Corinne were delayed for herbicide applications at all growth stages; however, application at the 9 to 12-node stage caused the most severe delay. All treatments of IMI herbicide caused yield reduction in the conventional cultivars in 2013. In contrast, IMI-resistant cultivars CDC Alma and CDC Cory demonstrated no negative response at any growth stage of IMI herbicide application. Visual injury estimates were negligible, and height, node development, days to flowering, maturity, and yield did not differ significantly between IMI-treated plants and the respective controls. These results demonstrated the potential of in-crop use of IMI herbicide on resistant chickpea cultivars to control broadleaf weeds.

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