CEPAVE   05420
CENTRO DE ESTUDIOS PARASITOLOGICOS Y DE VECTORES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Sublethal effects of two neurotoxicans insecicida on Araneus pratensis
Autor/es:
BENAMÚ, MARCO ANTONIO; SCHNEIDER, MARCE; PINEDA, SAMUEL; SANCHEZ, NORMA ELBA; GONZALEZ
Lugar:
Ghent, Belgica
Reunión:
Simposio; 59° International Symposium on crop protection; 2007
Institución organizadora:
Faculty of Bioscience Engineering. Ghent University, Belgium.
Resumen:
Spiders are important predators of several agricultural pests  and their rol as  indicators of ecosystem disturbs become relevant. In Argentina the cultivated area of soybean crop has been increased from the introduction of transgenic soybean resistant to glyphosate. This expansion produced an increment of the pesticides use to control  soybean pests. Moreover, conventional and non-selective pesticides are still used abusively to control several soybean-pests. The objective of this work was to evaluate the side effects of subletal concentrations of two neuroticans insecticides with a different mode of action: endosulfan (Endosulfan 35 Glex®, 25 and 2,5 mg/l a.i.) and spinosad (Tracer®, 48%, 30 y 3 mg/l a.i) towards Araneus pratensis. The insecticides were applied by ingestion way through the treated prey (Musca domestica). The endpoints were: mortality (lethal effect), behavior (prey consumption, regurgitation, spider web building, mating, ootheca construction and fertility) in the survivors. Spinosad (30 mg/l i.a) was more harmful than endosulfan (50 mg/l i.a) on the adult survivorship. Tremors and non-coordinated movements were observed in both treatments. The prey consumptions were significantly reduced by the two insecticides (~40% lower than control). Also, the spider web building was affected by the two insecticides but more significantly by spinosad. Moreover, though the mating was not affected by treatments, abnormal oothecas and dehydrated eggs were observed in treatments. This work reports that sublethal concentrations [(that represent ~25 and 2,5% of maximum field recommended concentrations (105 and 120 mg/l i.a, respectively)] showed a high risk to spiders. The consequences in the behavior changes of spiders and its role as a natural mortality factor of pests are discussed