Florida Entomologist (2002) 85, 191-196

J.P. Michaud (2002)
Non-target impacts of acaricides on ladybeetles in citrus: a laboratory study
Florida Entomologist 85 (1), 191-196
Abstract: Two ladybeetles, Cycloneda sanguinea (L) and Harmonia axyridis Pallas, were exposed to leaf residues and topical applications of five acaricide formulations commonly used in citrus production in Florida. Dicofol was the only compound demonstrating no toxicity to larvae of either species, even at twice the recommended rate. Abamectin + petrolium oil was the most toxic material; leaf residues applied at the recommended rate caused 100% mortality of both species. Diflubenzuron was toxic to larvae of both species as a leaf residue applied at twice the recommended rate, and to larvae of C. sanguinea when topically applied at the recommended rate. Fenbutatin oxide was toxic to larvae of C. sanguinea when topically applied at the recommended rate, and as a leaf residue applied at twice the recommended rate, but not to larvae of H. axyridis. Pyridaben was toxic to larvae of both species as a leaf residue applied at twice the recommended rate, and in topical application at the recommended rate. Adult beetles of both species survived topical applications of all materials without sustaining significant mortality over a 48-h period. Larvae of C. sanguinea surviving exposure to fenbutatin-oxide and diflubenzuron exhibited slower development than control larvae. Larvae of H. axyridis surviving exposure to abamectin + oil at 1/10 the recommended rate developed significantly faster than their control counterparts.

Dos especies de Coccinellidae, Cycloneda sanguinea (L) y Harmonia axyridis Pallas, fueron expuestas a cinco acaricidas de uso comun en citricultura en Florida en forma residual en hojas y en aplicaciones directas. Dicofol fue el unico compuesto que no mostro toxicidad alguna en larvas de ambas especies, inclusive al doble de la concentracion recomendada. Abamectin + aceite de petroleo fue el material mas toxico; residuos en hoja aplicadas a la dosis recomendada causaron 100% de mortalidad en larvas de ambas especies. Diflubenzuron fue toxico a larvas de ambas especies como residuo en hoja aplicado al doble de la concentracion recomendada, y a larvas de C. sanguinea cuando fue aplicado a la dosis recomendada en forma directo. Fenbutatin oxide fue toxico a larvas de C. sanguinea a la dosis recomendada en aplicacion directa, y como residuo en hojas aplicadas al doble de la concentracion recomendada, pero no a larvas de H. axyridis. Pyridaben fue toxico a larvas de ambas especies como residuo en hoja aplicado al doble de la concentracion recomendada, y en aplicacion directa a la dosis recomendada. Adultos de ambas especies sobreviviron aplicacions directas de todas las materiales sin mortalidad significativa sobre un periodo de 48-h. Larvas de C. sanguinea que sobrevivieron a fenbutatin-oxide y diflubenzuron mostraron un desarollo significativamente mas lento que larvas del testigo. Larvas de H. axyridis que sobrevivieron abamectin + oil a 1/10 el dosis recomendado mostraron un desarollo significativamente mas rapido que los testigos.
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Database assignments for author(s): J.P. Michaud

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
Harmonia axyridis (predator)			U.S.A. (SE)
Cycloneda sanguinea (predator)			U.S.A. (SE)