Journal of Economic Entomology (2017) 110, 2039-2045

P.R.R. Barbosa, J.B. Torres, J.P. Michaud and A.R.S. Rodrigues (2017)
High concentrations of chlorantraniliprole reduce its compatibility with a key predator, Hippodamia convergens (Coleoptera: Coccinellidae)
Journal of Economic Entomology 110 (5), 2039-2045
Abstract: Diamides are a novel insecticide group that act by disrupting insect muscle contraction. Recommended field rates (FRs) vary greatly among target pests and cropping systems, leading to variable risks for non-target organisms. We evaluated the toxicity of chlorantraniliprole to the predator Hippodamia convergens Guérin-Méneville (Coleoptera: Coccinellidae) by exposure to residues, topical application, and consumption of contaminated food. We also estimated lethal concentrations (LCs) of chlorantraniliprole in two target pests, cotton leafworm, Alabama argillacea (Hübner) (Lepidoptera: Erebidae), and tobacco budworm, Chloridea virescens (F.) (Lepidoptera: Noctuidae), by exposing larvae to treated cotton, Gossypium hirsutum L., leaves and assessed residual activity at various intervals after application to cotton plants. Exposure to dried residues and ingestion of treated moth eggs resulted in similar toxicity to H. convergens, whereas topical application was a less toxic route of exposure. Regardless of exposure route, the LC₅₀s and LC₉₀s obtained for H. convergens were higher than those calculated for the pests. Residues at the upper limit of the LC₉₀ for C. virescens remained effective against this pest for up to 16 d, while exhibiting minor impacts on H. convergens. In contrast, the FR concentration of C. virescens caused significant mortality in H. convergens. The results suggest that the current FR for C. virescens is too high to be safe for H. convergens, and given the LCs observed for this pest in the present study, trials to explore the potential efficacy of lower FRs are justified. Depending on the concentration and route of exposure, this insecticide has the potential to be compatible with H. convergens.
(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): J.P. Michaud, Jorge B. Torres

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Heliothis virescens	Cotton (Gossypium)
	Alabama argillacea	Cotton (Gossypium)
Hippodamia convergens (predator)	Heliothis virescens	Cotton (Gossypium)
Hippodamia convergens (predator)	Alabama argillacea	Cotton (Gossypium)