Consulta: subjectFacets:"Bt corn"
Registros recuperados: 13
Data/hora: 09/06/2024 06:47:06

Adoption of Transgenic Crops by Smallholder Farmers in Entre Rios, Argentina
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Paredes,   Cecilia; Martin,   Marshall A.
This is a study of the adoption of transgenic crops by 120 smallholder farmers interviewed in July 2005 in the communities of San Jose de Feliciano and La Paz in the Entre Rios Province of Argentina. Logistic regression results indicate that access to a planter is essential for smallholders to adopt Bt corn, while adopters of Roundup Ready™ soybeans have larger farms, access to credit, availability of all essential machinery, more years of schooling, and are primarily located in the La Paz community.
Tipo: Conference Paper or Presentation
Palavras-chave: Transgenic crops; Technology adoption; Bt corn; Roundup Ready™ soybeans; Biotechnology; Argentina; Smallholders; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 2007
URL: http://purl.umn.edu/9996

Managing European Corn Borer Resistance to Bt Corn with Dynamic Refuges
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Secchi,   Silvia; Hurley,   Terrance M.; Hellmich,   Richard L.
Genetically engineered Bt (Bacillus thuringiensis) corn provides farmers with a new tool for controlling the European corn borer (ECB). The high efficacy and potential rapid adoption of Bt corn has raised concerns that the ECB will develop resistance to Bt. The Environmental Protection Agency has responded to these concerns by requiring farmers to plant refuge corn. Current refuge requirements are based on models that do not consider the value of dynamically varying refuge in response to increased scarcity and diminished control over time or the importance of backstop technologies currently being developed. The purpose of this paper is to evaluate dynamically optimal refuge requirements with the arrival of alternative backstop technologies and to compare...
Tipo: Working or Discussion Paper
Palavras-chave: Bt corn; Optimal control; Pesticide resistance; Crop Production/Industries.
Ano: 2001
URL: http://purl.umn.edu/18626

The Value of Bt Corn in Southwest Kansas: A Monte Carlo Simulation Approach
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Hyde,   Jeffrey; Martin,   Marshall A.; Preckel,   Paul V.; Buschman,   Lawrent L.; Edwards,   C. Richard; Sloderbeck,   Phillip E.; Higgins,   Randall A.
While most Corn Belt farmers consider planting Bt corn to control European corn borer, southwestern Kansas farmers must also take into account an array of other insect pests, including corn rootworm, spider mites, and southwestern corn borer. This research uses a decision analysis framework to estimate the expected economic value of Bt corn in southwest Kansas. Mean per acre Bt values ranged from $12.49 to $34.60, well above the technology fee assumed to be $14 per unit, or $5.25 per acre at a seeding rate of 30,000 seeds per acre. The minimum value over all scenarios was $8.69 per acre. Using Monte Carlo simulation, it was shown that European and southwestern corn borer infestation probabilities, expected corn price, and expected pest-free yields are...
Tipo: Journal Article
Palavras-chave: Bt corn; Decision analysis; European corn borer; Integrated pest management; Monte Carlo simulation; Southwestern corn borer; Crop Production/Industries.
Ano: 2003
URL: http://purl.umn.edu/30721

Bt Corn Farmer Compliance with Insect Resistance Management Requirements: Results from the 2002 Minnesota and Wisconsin Farm Polls
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Buttel,   Frederick H.; Merrill,   Jeanne; Chen,   Lucy; Goldberger,   Jessica; Hurley,   Terrance M.
The U.S. Environmental Protection Agency (EPA) reregistered Bt corn in 2001 with mandatory Insect Resistance Management (IRM) requirements in order to promote sustainable use by farmers.  Since then studies report IRM compliance rates ranging from 80 to 90 percent.  Using survey data from Minnesota and Wisconsin, we show that previous compliance rate estimates are likely too high because they do not use a comprehensive measure for compliance.  With a more comprehensive measure, we find compliance rates ranging between 60 to 75 percent.
Tipo: Working or Discussion Paper
Palavras-chave: Bt corn; Compliance; Insect Resistance Management; Refuge; Crop Production/Industries.
Ano: 2005
URL: http://purl.umn.edu/13659

Revisiting the Impact of Bt Corn Adoption by U.S. Farmers
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Fernandez-Cornejo,   Jorge; Wechsler,   Seth James.
This study examines the impact of adopting Bt corn on farm profits, yields, and insecticide use. The study employs an econometric model that corrects for self-selection and simultaneity.  The model is estimated using nationwide farm-level survey data for 2005.  Regression analysis confirms that Bt adoption is associated with increased profits, yields and seeding rates.  However, the results of this analysis suggest that Bt adoption is not significantly related to insecticide use. This result appears to be related to the fact that insect infestation levels were lower in 2005 than they were in earlier years.
Tipo: Conference Paper or Presentation
Palavras-chave: Genetically engineered corn; Insect resistance; Bt corn; Insecticide use; Technology adoption; Yields; Production Economics; Research and Development/Tech Change/Emerging Technologies.
Ano: 2011
URL: http://purl.umn.edu/103327

Crop Choice, Non-Target Pest Levels, Yield Loss and Their Effect on Insecticide Use in South Dakota
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: McDonald,   Tia Michelle; Keating,   Ariel Ruth; Fausti,   Scott W.; Li,   Jing; Lundgren,   Jonathan G.
Agriculturally, South Dakota is a unique state possessing the highest rate of adoption for genetically modified crop varieties.  In 2009 ninety-six percent of corn acres planted in South Dakota were genetically modified compared with eighty-five percent nationally (Economic Research Service).  Additionally, South Dakota has seen a dramatic increase in the number of acres treated with insecticide over the past 20 years.  These two situations taken together seem to be counterintuitive.  Some genetically modified varieties, such as Bt corn, are equipped with genetic defenses so that they can protect the plant from target pests.  Intuitively, one would expect to see a decrease in insecticide use as adoption of genetically modified varieties increase.  Recent...
Tipo: Conference Paper or Presentation
Palavras-chave: Bt corn; GM crops; Insecticide; Agricultural and Food Policy; Crop Production/Industries; Q1; Q2; Q5.
Ano: 2010
URL: http://purl.umn.edu/61427

Economic Evaluation of Bt Corn Refuge Insurance
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Mitchell,   Paul D.; Hurley,   Terrance M.; Hellmich,   Richard L.
The EPA has imposed mandatory refuge requirements for Bt crops to prolong the efficacy of Bt. Growers have no economic incentive to plant the required refuge because refuge crops are on average less productive and more risky. This paper evaluates refuge insurance—insurance thatpays indemnities for yield losses on refuge due to insect damage—as a tool to increase grower compliance incentives. We determine actuarially fair insurance premiums, then evaluate the feasibility of private provision of refuge insurance and its impact on grower incentives to comply with refuge requirements. A private market for refuge insurance appears unlikely because our analysis suggests that even a 2 percent load on the actuarially fair premium makes growers unwilling to buy...
Tipo: Working or Discussion Paper
Palavras-chave: Bt corn; Crop insurance; Refuge crops; Pest-resistant management; European corn borer; Yield loss; Crop Production/Industries; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/18565

Estimating the Benefits of Bt Corn and Cost of Insect Resistance Management Ex Ante
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Hurley,   Terrance M.; Langrock,   Ines; Ostlie,   Kenneth.
This paper estimates farmer benefits for corn rootworm (CRW) active Bt corn and costs of complying with Environmental Protection Agency insect resistance management requirements.  The estimates are obtained from farmer survey data that were collected in Minnesota in 2002, just prior to the commercial releases of CRW Bt corn. Benefit estimates range from $14 to $33.4 million, while compliance cost estimated range from $3.5 to $8.7 million depending on whether or not CRW Bt corn also controlled the European corn borer and whether of not it was approved for sale in major export markets.
Tipo: Journal Article
Palavras-chave: Bt corn; Compliance costs; Corn rootworm; Insect resistance management; Willingness to pay; Crop Production/Industries.
Ano: 2006
URL: http://purl.umn.edu/8619

Fifteen Years Later: Examining the Adoption of Bt Corn Varieties by U.S. Farmers
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Fernandez-Cornejo,   Jorge; Wechsler,   Seth James.
This study presents recent results on the impact of adopting Bt corn on farm profits, yields, and seed and insecticide use.  The study employs an econometric model that corrects for self-selection and simultaneity and uses farm-level survey data for 2010.  Results confirm previous findings that Bt adoption is associated with increased profits and yields. However the Bt adoption is not significantly related to insecticide use as infestation levels in 2010 are very low and 90 percent of the farmers in the sample did not use insecticides at all.
Tipo: Presentation
Palavras-chave: Genetically engineered corn; Bt corn; Insecticide use; Corn yields. technology adoption.; Crop Production/Industries; Farm Management; Production Economics.
Ano: 2012
URL: http://purl.umn.edu/124257

Effect of Prices, Traits and Market Structure on Corn Seeding Density
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Mitchell,   Paul D.; Shi,   Guanming; Ma,   Xingliang; Lauer,   Joseph G.
Recent agronomic research finds that economically optimal seeding densities have likely increased for many Midwestern corn farmers as a result of genetic improvements including new GM traits such as Bt corn and herbicide tolerance.  We derive a per acre demand model for hybrid seed corn to examine the determinants of corn seeding densities and estimate the model using a large data set of individual farmer seed corn purchases.  Current results identify factors other than prices affecting farmer corn seeding densities.  Among these factors are the GM trait of the seed corn, measures of the local seed corn market structure, seed purchase source and intended end use.  We interpret these effects in terms of information effects—farmers with more/better access to...
Tipo: Conference Paper or Presentation
Palavras-chave: Hybrid seed corn; Bt corn; Herbicide tolerance; Herfindahl index; Corn borer; Rootworm; Hyperbolic yield model; Agribusiness; Crop Production/Industries; Farm Management; Industrial Organization; Production Economics; D2; D21; Q1; Q12.
Ano: 2009
URL: http://purl.umn.edu/49520

Production Risk, Farmer Welfare, and Bt Corn in the Philippines
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Sanglestsawai,   Santi; Rejesus,   Roderick M.; Yorobe,   Jose M., Jr.
This article examines the production risk effects and welfare implications of Bt corn adoption in the Philippines by specifically considering the impact of Bt on the mean, variance, and skewness of yields. Assessing the skewness effects of Bt provides further inferences about the downside risk protection of this technology in a developing country context. Stochastic production function estimation is utilized to achieve the study objective, including an approach that allows for examining the skewness effects of Bt within a damage abatement specification. Our results indicate that Bt corn do not have a statistically significant risk-reducing (i.e., variance-reducing) or downside risk-reducing (i.e., skewness-increasing) effect, the main benefit is through...
Tipo: Presentation
Palavras-chave: Bt corn; Damage Abatement; GM crop; Production Risk; Downside risk; Skewness; Stochastic Production Function; Risk and Uncertainty; Q12; Q1.
Ano: 2012
URL: http://purl.umn.edu/124237

ESTIMATING THE VALUE OF BT CORN: A SURVEY
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Hyde,   Jeffrey; Martin,   Marshall A.; Preckel,   Paul V.; Edwards,   C. Richard; Dobbins,   Craig L.
This document contains a survey used to gather data for use in estimating the value of Bt corn within a particular region.  The survey instrument is provided in an appendix.  The body of this paper provides background information regarding the survey and contact information for questions.
Tipo: Working or Discussion Paper
Palavras-chave: Bt corn; European corn borer; Southwestern corn borer; Economic benefits; Crop Production/Industries.
Ano: 2000
URL: http://purl.umn.edu/28661

Biological activity of Bt proteins expressed in different structures of transgenic corn against  Spodoptera frugiperda
Provedor de dados: Ciência Rural
Autores: Bernardi,Daniel; Bernardi,Oderlei; Horikoshi,Renato Jun; Salmeron,Eloisa; Okuma,Daniela Miyuki; Omoto,Celso.
ABSTRACT:  Spodoptera frugiperda (J. E. Smith) is the main target pest of Bt corn technologies, such as YieldGard VT PRO(tm) (Cry1A.105/Cry2Ab2) and PowerCore(tm) (Cry1A.105/Cry2Ab2/Cry1F). In this study, it was evaluated the biological activity of Bt proteins expressed in different plant structures of YieldGard VT PRO(tm) and PowerCore(tm) corn against  S. frugiperda . Complete mortality of S. frugiperda neonates was observed on leaf-disc of both Bt corn technologies. However, the mortality in silks and grains was lower than 50 and 6%, respectively. In addition, more than 49% of the surviving larvae in silks and grains completed the biological cycle. However, all life table parameters were negatively affected in insects that developed in silks and grains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fall armyworm; Bacillus thuringiensis; Bt corn; Insect resistance management.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000601019