Biblioteca Digital de VanguardiaEvaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina
The fall armyworm (FAW) is the most important threat to corn crops in Argentina, and there exists very little up-to-date information on its actual pest status because the available literature was published more than 20 years ago. Therefore, field surveys were carried out in the northeast of Argentin...
| Autores principales: | , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias
2013
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| Acceso en línea: | http://bdigital.uncu.edu.ar/6006 |
| _version_ | 1782341337782157312 |
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| author | Ayala, Oscar Navarro, Fernando Virla, Eduardo G. |
| author_facet | Ayala, Oscar Navarro, Fernando Virla, Eduardo G. |
| author_sort | Ayala, Oscar |
| collection | Repositorio |
| description | The fall armyworm (FAW) is the most
important threat to corn crops in Argentina, and
there exists very little up-to-date information
on its actual pest status because the available
literature was published more than 20 years
ago. Therefore, field surveys were carried
out in the northeast of Argentina, in order to
establish the attack rates and injury levels of
the pest in relation to the crop phenology. The
study was carried out at two localities: Colonia
Benítez, an agricultural region, and Tapenagá,
a cattle-raising area. At each site two 1-ha plots
were sown either with a Bt-corn expressing
Cry 1F protein or with an untransformed corn
germplasm. Optimal and late sowing was
assayed and FAW larval abundance, relative age
composition, attack rates and level of damage to
corn were recorded. At the moment of the field
experiments, Bt-corn was not affected by FAW
larvae. However, untransformed germplasms
were severely affected by FAW larvae, with an
average of attacked plants of 18% or more. In contrast to data obtained 30 years ago, higher values of FAW density were registered. Levels
of damage to corn plants were higher after the
V4 stage. It was found that the sowing date
affected the infestation levels and early seeding
avoided high armyworm densities that develop
later in the season; in northern Argentina, this
was only relevant in agricultural areas. |
| format | Artículo |
| id | uncu-6006 |
| institution | Biblioteca Digital - UNCUYO |
| language | Inglés |
| publishDate | 2013 |
| publisher | Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias
|
| record_format | ojs |
| spelling | uncu-60062014-09-24T11:49:38Z Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina Evaluación de las tasas de ataque y el nivel de daños por el gusano cogollero del maíz, Spodoptera frugiperda (Lepidoptera: Noctuidae), en el noreste de Argentina Ayala, Oscar Navarro, Fernando Virla, Eduardo G. Lepidoptera Spodoptera Zea Mays Noctuidae Daños a las plantas Cultivo Maíz Plagas Gusano cogollero The fall armyworm (FAW) is the most important threat to corn crops in Argentina, and there exists very little up-to-date information on its actual pest status because the available literature was published more than 20 years ago. Therefore, field surveys were carried out in the northeast of Argentina, in order to establish the attack rates and injury levels of the pest in relation to the crop phenology. The study was carried out at two localities: Colonia Benítez, an agricultural region, and Tapenagá, a cattle-raising area. At each site two 1-ha plots were sown either with a Bt-corn expressing Cry 1F protein or with an untransformed corn germplasm. Optimal and late sowing was assayed and FAW larval abundance, relative age composition, attack rates and level of damage to corn were recorded. At the moment of the field experiments, Bt-corn was not affected by FAW larvae. However, untransformed germplasms were severely affected by FAW larvae, with an average of attacked plants of 18% or more. In contrast to data obtained 30 years ago, higher values of FAW density were registered. Levels of damage to corn plants were higher after the V4 stage. It was found that the sowing date affected the infestation levels and early seeding avoided high armyworm densities that develop later in the season; in northern Argentina, this was only relevant in agricultural areas. El cogollero es la plaga más importante del maíz en Argentina, siendo escasa y desactualizada la información sobre su estatus como plaga en los últimos 20 años. Se llevaron a cabo estudios de campo a fin de establecer las tasas de ataque y los niveles de daño de la plaga en relación con la fenología del cultivo en el noreste de Argentina. El estudio se realizó en dos localidades: Colonia Benítez, zona agrícola, y Tapenagá, zona ganadera. En cada localidad se sembraron dos parcelas de una hectárea, una con maíz transgénico expresando la proteína Bt Cry 1F y la otra con su correspondiente isogénico no transformado. Se registraron para dos fechas de siembra: cantidad de larvas, composición relativa de edades, tasa de ataque y nivel de daño al cultivo. En el momento del ensayo de campo, el maíz Bt no fue afectado por la plaga; sin embargo, el isogénico (sin gen Bt) fue atacado con una media superior al 18% de plantas dañadas. Comparando con datos obtenidos hace 30 años en esta región, se obtuvieron mayores valores de densidad de larvas/planta. Los niveles de daño fueron mayores después de V4. La fecha de siembra incide en los niveles de infestación: siembras tempranas evitan las altas densidades del cogollero que se desarrollan durante el verano, pero para la región estudiada esto solo fue relevante en la zona agrícola Fil: Ayala, Oscar . Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias Fil: Navarro, Fernando. Universidad Nacional de Tucumán Fil: Virla, Eduardo G.. San Miguel de Tucumán (Tucumán, Argentina). CONICET - Planta Piloto de Procesos Industriales Microbiológicos-Biotecnología, Div. Control Biológico. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias 78 Revista de la Facultad de Ciencias Agrarias Vol. 45, no. 2 Revista de la Facultad de Ciencias Agrarias, Vol. 45, no. 2 2013-12-02 eng Inglés http://bdigital.uncu.edu.ar/6005 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar/ article info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias http://bdigital.uncu.edu.ar/6006 |
| spellingShingle | Lepidoptera Spodoptera Zea Mays Noctuidae Daños a las plantas Cultivo Maíz Plagas Gusano cogollero Ayala, Oscar Navarro, Fernando Virla, Eduardo G. Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina |
| title | Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina
|
| title_full | Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina
|
| title_fullStr | Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina
|
| title_full_unstemmed | Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina
|
| title_short | Evaluation of the attack rates and level of damages by the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), affecting corn-crops in the northeast of Argentina
|
| title_sort | evaluation of the attack rates and level of damages by the fall armyworm, spodoptera frugiperda (lepidoptera: noctuidae), affecting corn-crops in the northeast of argentina |
| topic | Lepidoptera Spodoptera Zea Mays Noctuidae Daños a las plantas Cultivo Maíz Plagas Gusano cogollero |
| url | http://bdigital.uncu.edu.ar/6006 |