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	Provedor de dados AgEcon (3) Colegio de Postgraduados (1) Autor Kipkoech, Anderson Kipruto (2) Mithofer, Dagmar (2) Schulthess, Fritz (2) Yabann, Wilson K. (2) Amudavi, David Mulama (1) Karugia, Joseph Thuo (1) Khan, Zeyaur R. (1) Kipsat, Mary J. (1) Maritim, Henry K. (1) Mbogoh, Stephen G. (1) Muchugu, Erick (1) Njuguna, Esther M. (1) Nyikal, Rose Adhiambo (1) Palacios Torres, Rogelio Enrique (1) Mais... Palavra-chave Stemborers (4) Agricultural and Food Policy (2) Biological control (2) Community/Rural/Urban Development (2) Crop Production/Industries (2) Farm Management (2) Food Security and Poverty (2) Maize (2) Parasitoids (2) Aedeagus (1) Agricultural information (1) Barrenadores (1) Benefit-cost (1) Claves ilustradas (1) Control technologies (1) Demand and Price Analysis (1) Doctorado (1) Economic valuation (1) Edeagos (1) Entomología y Acarología (1) Mais... Tipo do documento Conference Paper or Presentation (2) Journal Article (1) Tesis (1) Ano 2010 (1) 2009 (1) 2008 (2) País United States (3) Mexico (1) Idioma Inglês (3) Espanhol (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Identificación, distribución geográfica y aspectos de su biología de trece especies de Agromyzidae (Insecta: Diptera) en México Colegio de Postgraduados Palacios Torres, Rogelio Enrique. Se presentan 13 especies de Agromyzidae de la Magdalena Contreras, (Distrito Federal) y los municipios de Texcoco, (Estado de México), Huautla, (Estado de Hidalgo), Yautepec y Miacatlán, (Estado de Morelos), Altamira, (Estado de Tamaulipas), y Nativitas, (Estado de Tlaxcala). Se proporciona una descripción del adulto, distribución geográfica y algunos aspectos de su biología de cada especie, además de dos claves para su identificación con fotografías que ilustran las características del edeago y bomba eyaculadora por especie. Las especies identificadas fueron: Amauromyza abnormalis (Malloch), Liriomyza brassicae (Riley), Liriomyza sabaziae Spencer, Liriomyza trifolii (Burgess), Melanagromyza caerulea (Malloch), Melanagromyza floris Spencer,... Tipo: Tesis Palavras-chave: Minadores; Barrenadores; Edeagos; Parasitoides; Claves ilustradas; Doctorado; Entomología y Acarología; Leafminers; Stemborers; Aedeagus; Parasitoids; Illustrated keys. Ano: 2008 URL: http://hdl.handle.net/10521/1525 The economic value of releasing parasitoid for the control of maize stemborers in East and Southern Africa AgEcon Kipkoech, Anderson Kipruto; Schulthess, Fritz; Yabann, Wilson K.; Maritim, Henry K.; Muchugu, Erick; Mithofer, Dagmar. The braconid larval parasitoid Cotesia flavipes Cameron was introduced from Asia into East and Southern African region starting in 1993 to control the invasive exotic maize stemborer Chilo partellus (Swinhoe) (Lepidoptera: Crambidae). A quasi-experiment was constructed using farmers that applied sublethal dosages of pesticide in assessing the counterfactual for the impact of the establishment of the introduced parasitoid in five countries in the region. Logistic regression method was used to estimate the probability that farmers’ would inadvertently exclude parasitoids in their maize field. Thereafter the propensity score matching method was used to find corresponding farmers excluding parasitoids among those who did not for yield comparison. The... Tipo: Conference Paper or Presentation Palavras-chave: Benefit-cost; Biological control; Impact assessment; Maize; Stemborers; Parasitoids; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; Food Security and Poverty. Ano: 2009 URL: http://purl.umn.edu/51679 Measuring the economic value of redistributing parasitoids for the control of the maize stemborer Busseola fusca Fuller (Lepidoptera: Noctuidae) in Kenya AgEcon Kipkoech, Anderson Kipruto; Schulthess, Fritz; Yabann, Wilson K.; Kipsat, Mary J.; Mithofer, Dagmar. This study assesses the ex ante economic impact of the establishment of two parasitoids, the scelionid egg parasitoid Telenomus isis Polaszek from West Africa and a virulent strain of the braconid larval parasitoid Cotesia sesamiae Cameron from western Kenya, to control stemborer. Using a Cobb-Douglas production function, it was estimated that yields increased by 28.5% when pesticides were used to control stemborers. The benefit-cost ratio after the establishment of the parasitoids ranged from 1:1 to 777:1, with a net present value of up to US$192 million. The study demonstrates the potential of redistributing parasitoids indigenous to Africa for the control of African stemborers. Because the benefits of biological control are positively scale dependent,... Tipo: Journal Article Palavras-chave: Biological control; Economic valuation; Maize; Stemborers; Crop Production/Industries. Ano: 2010 URL: http://purl.umn.edu/93864 Classification and influence of agricultural information on striga and stemborer control in Suba and Vihiga Districts, Kenya AgEcon Njuguna, Esther M.; Amudavi, David Mulama; Khan, Zeyaur R.; Mbogoh, Stephen G.; Nyikal, Rose Adhiambo; Karugia, Joseph Thuo. This paper reports on findings of a study to examine the sources used by farmers in search of agricultural information on striga and/or stemborers control technologies and factors that influence acquisition of such information in Western Kenya region. A random sample of 476 households in Suba and Vihiga districts were interviewed and 15 information pathways were identified. Using principle component analysis (PCA) to derive few latent variables that encapsulate maximum variance in the pathways, two components (latent variables) proxying for ‘agricultural knowledge’ were extracted. Type I-knowledge (first component) loaded heavily with sources that had ‘group’ information searching. Type II-knowledge (second component) loaded heavily with sources... Tipo: Conference Paper or Presentation Palavras-chave: Agricultural information; Improved technology; Striga; Stemborers; Control technologies; Kenya; Agricultural and Food Policy; Community/Rural/Urban Development; Demand and Price Analysis; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Resource /Energy Economics and Policy. Ano: 2008 URL: http://purl.umn.edu/52081 Registros recuperados: 4 Primeira ... 1 ... 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