CEPAVE   05420
CENTRO DE ESTUDIOS PARASITOLOGICOS Y DE VECTORES
Unidad Ejecutora - UE
artículos
Título:
Efecto de las arañas (Arachnida, Araneae) como depredadoras de insectos plaga en cultivos de alfalfa (Medicago sativa) (Fabaceae) en Argentina.
Autor/es:
A. ARMENDANO; A. GONZÁLEZ
Revista:
REVISTA DE BIOLOGÃA TROPICAL
Editorial:
REVISTA DE BIOLOGIA TROPICAL
Referencias:
Año: 2011 vol. 59 p. 1651 - 1662
ISSN:
0034-7744
Resumen:
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Abstract: Effect of spiders
(Arachnida: Araneae) as predators of insect pest in alfalfa crops (Medicago
sativa) 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): 000-000. Epub 2011 December 01.