Benchmark study on glyphosate-resistant cropping systems in the United States. Part 6: Timeliness of economic decision-making in implementing weed resistance management strategies

2011 ◽  
Vol 67 (7) ◽  
pp. 785-789 ◽  
Author(s):  
Jason W Weirich ◽  
David R Shaw ◽  
Keith H Coble ◽  
Micheal DK Owen ◽  
Philip M Dixon ◽  
...  
Keyword(s):  
United States ◽  
Decision Making ◽  
Cropping Systems ◽  
Management Strategies ◽  
Resistance Management ◽  
The United States ◽  
Economic Decision ◽  
Benchmark Study ◽  
Economic Decision Making ◽  
Weed Resistance

Decentralisation in Planning and Economic Decision-Making in Ghana

1975 ◽  
Vol 13 (1) ◽  
pp. 126-133
Author(s):  
Leslie E. Grayson
Keyword(s):  
United States ◽  
Decision Making ◽  
Developed Countries ◽  
The United States ◽  
Less Developed Countries ◽  
Local Conditions ◽  
Economic Decision ◽  
Body Of Knowledge ◽  
Economic Decision Making ◽  
General Guide

‘The general guide should be to transfer power to the smallest unit consistent with the scale of the problem.’ This quotation is based on the experience of the United States, but should be even more applicable to less-developed countries, because of their poor system of communications. In this article I shall examine the attempts to decentralise planning and economic decision-making in Ghana, analyse the rationale for such moves away from centralisation, and evaluate the Ghanaian experience against the existing body of knowledge on this subject and the special local conditions that are relevant.

Benchmark study on glyphosate-resistant cropping systems in the United States. Part 1: Introduction to 2006-2008

2011 ◽  
Vol 67 (7) ◽  
pp. 741-746 ◽  
Author(s):  
David R Shaw ◽  
Micheal DK Owen ◽  
Philip M Dixon ◽  
Stephen C Weller ◽  
Bryan G Young ◽  
...  
Keyword(s):  
United States ◽  
Cropping Systems ◽  
The United States ◽  
Benchmark Study

Benchmark study on glyphosate-resistant crop systems in the United States. Economics of herbicide resistance management practices in a 5 year field-scale study

2014 ◽  
Vol 70 (12) ◽  
pp. 1924-1929 ◽  
Author(s):  
C Blake Edwards ◽  
David L Jordan ◽  
Michael DK Owen ◽  
Philip M Dixon ◽  
Bryan G Young ◽  
...  
Keyword(s):  
United States ◽  
Herbicide Resistance ◽  
Management Practices ◽  
Resistance Management ◽  
The United States ◽  
Field Scale ◽  
Benchmark Study

scholarly journals Independent Emergence of Resistance to Seven Chemical Classes of Fungicides in Botrytis cinerea

2015 ◽  
Vol 105 (4) ◽  
pp. 424-432 ◽  
Author(s):  
Dolores Fernández-Ortuño ◽  
Anja Grabke ◽  
Xingpeng Li ◽  
Guido Schnabel
Keyword(s):  
United States ◽  
Botrytis Cinerea ◽  
Target Genes ◽  
Management Strategies ◽  
Resistance Management ◽  
Monitoring Program ◽  
Gene Mutations ◽  
The United States ◽  
Gray Mold ◽  
Development Of Resistance

Gray mold, caused by the fungal pathogen Botrytis cinerea, is one of the most destructive diseases of small fruit crops and control is largely dependent on the application of fungicides. As part of a region-wide resistance-monitoring program that investigated 1,890 B. cinerea isolates from 189 fields in 10 states of the United States, we identified seven isolates (0.4%) from five locations in four different states with unprecedented resistance to all seven Fungicide Resistance Action Committee (FRAC) codes with single-site modes of action including FRAC 1, 2, 7, 9, 11, 12, and 17 registered in the United States for gray mold control. Resistance to thiophanate-methyl, iprodione, boscalid, pyraclostrobin, and fenhexamid was based on target gene mutations that conferred E198A and F200Y in β-tubulin, I365N/S in Bos1, H272R/Y in SdhB, G143A in Cytb, and T63I and F412S in Erg27. Isolates were grouped into MDR1 and MDR1h phenotypes based on sensitivity to fludioxonil and variations in transcription factor mrr1. MDR1h isolates had a previously described 3-bp deletion at position 497 in mrr1. Expression of ABC transporter atrB was increased in MDR1 isolates but highest in MDR1h isolates. None of the isolates with seven single resistances (SR) had identical nucleotide variations in target genes, indicating that they emerged independently. Multifungicide resistance phenotypes did not exhibit significant fitness penalties for the parameters used in this study, but MDR1h isolates produced more sclerotia at low temperatures and exhibited increased sensitivity to salt stress. In this study we show that current resistance management strategies have not been able to prevent the geographically independent development of resistance to all seven site-specific fungicides currently registered for gray mold control in the United States and document the presence of MDR1h in North America.

scholarly journals Carrots and Sticks: Incentives and Regulations for Herbicide Resistance Management and Changing Behavior

Weed Science ◽  
2016 ◽  
Vol 64 (SP1) ◽  
pp. 627-640 ◽  
Author(s):  
Michael Barrett ◽  
Michael Barrett ◽  
John Soteres ◽  
David Shaw
Keyword(s):  
United States ◽  
Herbicide Resistance ◽  
Weed Management ◽  
Cropping Systems ◽  
Wide Spectrum ◽  
Resistance Management ◽  
Herbicide Tolerance ◽  
The United States ◽  
Weed Species ◽  
Agricultural Community

Although the problem of herbicide resistance is not new, the widespread evolution of glyphosate resistance in weed species such as Palmer amaranth (Amaranthus palmeriS. Wats.), common waterhemp (Amaranthus rudisSauer), and kochia [Kochia scoparia(L.) Schrad.] raised awareness throughout the agricultural community of herbicide resistance as a problem. Glyphosate-resistant weeds resulted in the loss of a simple, single herbicide option to control a wide spectrum of weeds that gave efficacious and economical weed management in corn (Zea maysL.), soybean [Glycine max(L.) Merr.], and cotton (Gossypium hirsutumL.) crops engineered for tolerance to this herbicide and planted over widespread areas of the South and Midwest of the United States. Beyond these crops, glyphosate is used for vegetation management in other cropping systems and in noncrop areas across the United States, and resistance to this herbicide threatens its continued utility in all of these situations. This, combined with the development of multiple herbicide-resistant weeds and the lack of commercialization of herbicides with new mechanisms of action over the past years (Duke 2012), caused the weed science community to realize that stewardship of existing herbicide resources, extending their useful life as long as possible, is imperative. Further, while additional herbicide tolerance traits are being incorporated into crops, weed management in these crops will still be based upon using existing, old, herbicide chemistries.

Benchmark study on glyphosate-resistant cropping systems in the United States. Part 5: Effects of glyphosate-based weed management programs on farm-level profitability

2011 ◽  
Vol 67 (7) ◽  
pp. 781-784 ◽  
Author(s):  
Jason W Weirich ◽  
David R Shaw ◽  
Micheal DK Owen ◽  
Philip M Dixon ◽  
Stephen C Weller ◽  
...  
Keyword(s):  
United States ◽  
Weed Management ◽  
Cropping Systems ◽  
The United States ◽  
Farm Level ◽  
Benchmark Study ◽  
On Farm

Benchmark study on glyphosate-resistant cropping systems in the United States. Part 4: Weed management practices and effects on weed populations and soil seedbanks

2011 ◽  
Vol 67 (7) ◽  
pp. 771-780 ◽  
Author(s):  
Robert G Wilson ◽  
Bryan G Young ◽  
Joseph L Matthews ◽  
Stephen C Weller ◽  
William G Johnson ◽  
...  
Keyword(s):  
United States ◽  
Weed Management ◽  
Management Practices ◽  
Cropping Systems ◽  
The United States ◽  
Benchmark Study
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