Pest Management Science (2012) 68, 914-921

Erika L. Sántis, Luis A. Hernández, Ana M. Martínez, Jesús Campos, José I. Figueroa, Philippe Lobit, Juan M. Chavarrieta, Elisa Viñuela, Guy Smagghe and Samuel Pineda (2012)
Long-term foliar persistence and efficacy of spinosad against beet armyworm under greenhouse conditions
Pest Management Science 68 (6), 914-921
Abstract: BACKGROUND: The immediate lethality caused by spinosad has been widely studied on Spodoptera exigua (Hübner). However, long-term effects can also provide valuable information on insecticide toxic action. Here, the persistence of spinosad on Capsicum annuum L. foliage and the lethal and sublethal effects of greenhouse-aged foliar residues of this insecticide on third instars of S. exigua are reported.
RESULTS: Foliage was collected at 0, 3, 5, 10, 20, 30, 40 and 50 days after application, and spinosad residues were measured. Residues decreased over time according to first-order kinetics. The average rate constant and half-life of disappearance were 4.44 × 10⁻³ and 156 days and 5.80 × 10⁻³ and 120 days for 60 and 120 mg L⁻¹ respectively. Larval mortality gradually decreased, corresponding to the residues, but was still appreciable (35 and 65% for 60 and 120 mg L⁻¹ respectively) when the larvae were fed with foliage collected 50 days after treatment. Subsequently, pupal development was reduced and varied between 20 and 60% and between 21 and 41% for 60 and 120 mg L⁻¹, respectively, in all ages of leaf residues that were bioassayed. At all time points, the consumption rate by the larvae was reduced between 62 and 84% for both concentrations that were bioassayed.
CONCLUSION: It is concluded that, under the present greenhouse conditions, the degradation of spinosad was slower than that reported by other authors in the field, and, because of that, its residues could cause lethal and sublethal effects to S. exigua larvae.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Guy Smagghe, Elisa Viñuela

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Spodoptera exigua	Green pepper/chilli (Capsicum)