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| Flores F,Alberto; Silva A,Gonzalo; Tapia V,Maritza; Casals B,Pedro. |
| El uso de acaricidas de alta toxicidad en la producción y manejo de plantas ornamentales es un tema que debería preocupar a los consumidores. Se evaluó la susceptibilidad en laboratorio de dos poblaciones de Tetranychus urticae colectadas una en Primula obconica Hance y la otra en Convolvulus arvenis L, que se usó como raza sensible de referencia, a dicofol, abamectina, sola y en mezcla con el surfactante fosfatidilcolina, azadirachtina, azufre, pyridaben y fenazaquin. Las variables evaluadas fueron mortalidad, concentración letal 50% (CL50) y 90% (CL90), tiempo letal 50% (TL50) y 90% (TL90), eficacia e índice de resistencia (IR). El diseño experimental fue completamente al azar. Cada acaricida se evaluó en ¼, ½, 1, 2 y 4 veces la dosis recomendada según... |
| Tipo: Journal article |
Palavras-chave: Tolerancia; Arañita bimaculada; Ácaros. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200014 |
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| Salvadores U,Yessica; Silva A,Gonzalo; Tapia V,Maritza; Hepp G,Ruperto. |
| El gorgojo del maíz Sitophilus zeamais Motschulsky, es considerado una de las plagas mas importantes de productos almacenados. Se evaluaron, en laboratorio, polvos vegetales provenientes de nueve especias condimentarias para el control de S. zeamais en concentraciones de 0,5; 1; 2 y 4%. Las variables evaluadas fueron mortalidad y emergencia (F1) de adultos y pérdida de peso y germinación del grano. También se evaluó el efecto repelente y fumigante a las concentraciones de 0,5; 1 y 2%. El diseño experimental fue completamente al azar, los tratamientos tuvieron cuatro repeticiones y el grupo de tratamientos fue repetido tres veces. Las mayores mortalidades se obtuvieron con Piper nigrum L. a 1% (83,4%), 2% (97,6%) y 4% (100%). Las menores emergencias de... |
| Tipo: Journal article |
Palavras-chave: Granos almacenados; Sustancias aromáticas; Especies condimentarias. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200004 |
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| Ortiz U,Ana; Silva A,Gonzalo; Urbina P,Angélica; Zapata S.M,Nelson; Rodríguez M,J. Concepción; Lagunes T,Angel. |
| The maize weevil (Sitophilus zeamais Motschulsky) is one of the most widespread pests and causes heavy losses of stored grain throughout the world. Control of this insect is primarily dependent upon continued applications of organophosphorus and pyrethroid insecticides and fumigants as phosphine but the increasing problems with current insecticides drive the need for research and to develop new control methods. The insecticidal effect of leaf powder of tepa, Laureliopsis philippiana (Looser) Shodde, was evaluated against maize weevil under laboratory conditions. The parameters evaluated were adult mortality and emergence, grain weight loss and germination, and residual, repellent and fumigant effect. The highest levels of insect mortality were registered... |
| Tipo: Journal article |
Palavras-chave: Stored grains; Botanical insecticides; Maize weevil. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100011 |
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| Betancur R,Jessica; Silva A,Gonzalo; Rodríguez M,J. Concepción; Fischer G,Susana; Zapata S.M,Nelson. |
| In stored grains, the main agents diminishing production are insects, which can produce losses between 20% and 80% before harvest or under storage. The insecticidal properties of the essential oil of fresh leaves of Peumus boldus Molina against maize weevil (Sitophilus zeamais Motschulsky) adults were determined under laboratory conditions. The highest mortality (100%) was achieved at 4% concentration by contact with a treated glass surface. The same concentration in impregnated corn (Zea mays L.) grain, resulted in 98.7% mortality. Mortality by fumigant action at 6 h was 100% with 35 µL oil in 0.15 L (air volume). Concentrations 1, 2 and 4% of essential oil produced 0% F1 adult emergence. At 10 d of residual effect, the 4% concentration reached 63.7%... |
| Tipo: Journal article |
Palavras-chave: Maize weevil; Boldus; Stored grains; Botanical insecticides. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300007 |
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| Ortiz U,Margarita; Silva A,Gonzalo; Tapia V,Maritza; Rodriguez M,J. Concepción; Lagunes T,Angel; Santillán-Ortega,Candelario; Robles-Bermúdez,Agustín; Aguilar-Medel,Sotero. |
| The maize weevil (Sitophilus zeamais Motschulsky) and the red flour beetle (Tribolium castaneum Herbst) are two key pests of stored-grain products worldwide. The insecticidal activity of boldo (Peumus boldus Molina) powder, liquid ethanolic and hexanic extracts against S. zeamais and T. castaneum were evaluated under laboratory conditions. The evaluated variables were mortality, emergence of adult insects (F1), and grain weight loss. The experimental design was completely randomized. The mortality in S. zeamais was 100% even at the lowest powder concentration (0.5% w/w), whereas emergence of F1 adult insects was 0% and grain weight loss was < 0.08%. For T. castaneum, only 8 and 16% w/w powder concentrations reached 100% mortality. The liquid ethanolic... |
| Tipo: Journal article |
Palavras-chave: Botanical insecticides; Stored grains; Maize weevil; Red flour beetle. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300007 |
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