Clicks: 253
ID: 225415
2011
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Abstract
Effect of spiders (Arachnida: Araneae) as predators of insect pest in alfalfa crops (Medicago sativa) (Fabaceae) in Argentina. Spiders are predators that reduce insect pest populations in agroecosystems. Trials were conducted to measure the selectivity against different insect preys, the daily consumption, effect of predators alone and together with a known number of preys, and the indirect effect of predators on vegetation. For this, experimental units (1x1m) were used covered with a fine plastic mesh. Misumenops pallidus, Oxyopes salticus and Araneus sp. were used as generalist predators, and aphids, weevils, locusts, chrysomelids and Lepidoptera larvae as their potential preys. Among the preys offered, the spiders preferred Lepidoptera larvae compared to the other two pests groups (weevils and aphids). The maximum consumption rate was of 93.33% for Lepidoptera larvae, 25.33% for aphids and 11.67% for weevils. The Q Index values for the three species of spiders showed a positive selectivity only for defoliating larvae. O. salticus showed the highest values of consumption rates while Rachiplusia nu was the most consumed. The maximum value of consumption in 24 hours was showed by O. salticus on R. nu (C)=2.8. The association of several species of predatory spiders increased the total number of insects captured, and also showed that the addition of spiders caused a decrease in the number of leaves damaged by the effect of lepidopterous larvae. Rev. Biol. Trop. 59 (4): 1651-1662. Epub 2011 December 01
Las arañas son depredadoras capaces de reducir las poblaciones de insectos plaga en agroecosistemas. Para medir la selectividad frente a distintas presas, se realizaron ensayos de consumo diario, efecto de los depredadores aisladamente y en conjunto sobre el número de presas y efecto indirecto de los depredadores sobre la vegetación; se utilizaron jaulas experimentales de 1x1m cubiertas con una fina malla plástica. Misumenops pallidus, Oxyopes salticus y Araneus sp. fueron utilizadas como depredadores generalistas, áfidos gorgojos, larvas de lepidópteras, crisomélidos y ortópteros como sus presas potenciales. Las arañas prefirieron larvas de lepidópteros frente a curculiónidos y áfidos. El consumo máximo de larvas de lepidópteros fue de 93.33%, áfidos 25.33% y curculiónidos 11.67%. El Índice Q para las tres especies de arañas demostró una selectividad positiva sólo para las larvas defoliadoras. O. salticus presentó las tasas de consumo mayores. Rachiplusia nu fue la especie más consumida. El valor máximo de consumo registrado en 24h fue para O. salticus frente a R. nu (C)=2.8. La asociación de varias especies de arañas depredadoras incrementó el total de insectos capturados. La presencia de arañas provocó la disminución del número de hojas dañadas por el efecto de las larvas de lepidópteros plaga
Reference Key
armendano2011revista<title Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Andrea Armendano, Alda González
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Journal science journal of university of zakho
Year 2011
DOI
DOI not found
URL
http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442011000400018
Keywords
agroecosystems

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