Non-target Effects Of Dalaca pallens Blanchard Control Examined Through Principal Response Curves: A Guild Approach In Southern Chile

The non-target effects of biological control are a complex matter requiring a multi-approach analysis. A fungal biopesticide is under research to control the larval stages of the ghost moth Dalaca pallens Blanchard (Lepidoptera: Hepialidae) in southern Chile. A field experiment was conducted to comp...

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Bibliographic Details
Published in:Chilean journal of agricultural research 2008-09, Vol.68 (3), p.228-237
Main Authors: Devotto, Luis, Cisternas, Ernesto, Carrillo, Roberto, Gerding, Marcos
Format: Article
Language:eng ; por
Subjects:
AGRICULTURE, MULTIDISCIPLINARY
AGRONOMY
Beauveria bassiana
biopesticida
biopesticide
entomopathogen
entomopatógeno
ghost moth
Hepialidae
Lepidoptera
plagas de praderas
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Summary:The non-target effects of biological control are a complex matter requiring a multi-approach analysis. A fungal biopesticide is under research to control the larval stages of the ghost moth Dalaca pallens Blanchard (Lepidoptera: Hepialidae) in southern Chile. A field experiment was conducted to compare the effects of the biological control agent Beauveria bassiana (Balsamo) Vuillemin (1012 spores ha-1) and the insecticide lambda-cyhalothrin (7.5 g active ingredient ha-1) on non-target invertebrate species belonging to different guilds. The soil invertebrates were collected by using pitfall trapping and soil coring before and after spraying the biocontrol agent or the insecticide. Caught individuals were assigned to predator, herbivore or decomposer guilds and then a relatively new multivariate technique called principal response curves (PRC) was adopted to track the potential treatment effects over time in the abundance or activity of the non-target guilds. The products targeting D. pallens caused different effects on guilds: lambda-cyhalothrin decreased the activity-density of the predator guild but not herbivore or decomposer guilds, while the biological control agent caused no reduction in the activity-density of the three examined guilds. The negative effects of the insecticide were present from 1 to 60 days after treatment.
ISSN:0718-5820
0718-5839
0718-5839
DOI:10.4067/S0718-58392008000300002