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José Paulo Gonçalves Franco da Silva; Edson Luiz Lopes Baldin; Efrain Santana de Souza; André Luiz Lourenção (2012)
Publisher: Instituto de Investigaciones Agropecuarias, INIA
Journal: Chilean Journal of Agricultural Research
Languages: English
Types: Article
Subjects: Glycine max, mosca-blanca, resistencia de plantas, atractividad, no-preferencia, tricoma, Glycine max, silverleaf whitefly, host plant resistance, attractiveness, non-preference, trichome, Agriculture, S, Environmental sciences, GE1-350
Since it was first reported in Brazil in the 1990s, the B biotype of silverleaf whitefly (Bemisia tabaci Genn., Hemiptera: Aleyrodidae) has been recognized as an important pest in soybeans (Glycine max L.), reducing the productivity of this legume species in some areas of the country. As an alternative to chemical control, the use of resistant genotypes represents an important tool for integrated pest management (IPM). This study evaluated the performance of 10 soybean genotypes prior to whitefly infestation, by testing attractiveness and preference for oviposition in the greenhouse and antibiosis in the laboratory. In a multiple-choice test, 'IAC-17' was the least attractive to insects. In a no-choice test, 'IAC-17' was the least attractive for egg deposition, indicating the occurrence of non-preference for oviposition on this genotype. Trichome density was positively correlated with the oviposition site and may be associated with the resistance of 'IAC-17' to infestation. The genotypes 'IAC-PL1', 'IAC-19', 'Conquista', 'IAC-24' and 'IAC-17' extended the insect's life cycle, indicating the occurrence of a small degree of antibiosis and/or non-preference for feeding.
Desde que se registró por primera vez en Brasil en la década de 1990, el biotipo B de la mosca-blanca (Bemisia tabaci Genn., Hemiptera: Aleyrodidae), se reconoce como una importante plaga de la soya (Glycine max L.) y es lo que reduce la productividad de estas especies de leguminosas en algunas zonas del pais. Como una alternativa al control químico, el uso de genotipos resistentes representa una herramienta importante para la gestión integrada de plagas (MIP). Este trabajo evaluó el comportamiento de 10 genotipos de soya frente al ataque de la mosca-blanca, por medio de ensayos de atractividad y preferencia para ovipostura en invernaderos y antibiosis en laboratorio. En una prueba de elección multiple, 'IAC-17' fue el menos atractivo para los insectos. En una prueba sin elección, 'IAC-17' fue el menos atractivo para la deposición de huevos, lo que indica la ocurrencia de no preferencia para ovipostura de este genotipo. La densidad de tricomas se correlacionó positivamente con el sitio de ovipostura y pueden estar asociados con la resistencia de 'IAC-17' a la infestación. Los genotipos 'IAC-PL1' 'IAC-19', 'Conquista', 'IAC-24' y 'IAC-17' extendieron el ciclo de vida del insecto, lo que indica la aparición de un pequeno grado de antibiosis y/o no preferencias para la alimentación.

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