Effect of seven new orchard pesticides on <i>Galendromus occidentalis</i> in laboratory studies

Bostanian, N. J.; Thistlewood, H. M. A.; Hardman, John; Laurin, Marie-Claude; Racette, G.

doi:10.1002/ps.1721

Cited by 46 publications

(19 citation statements)

References 21 publications

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“…While the response of Galendromus spp. to imidacloprid exposure in the field has not been examined before, several laboratory [38], [39] and greenhouse [37] studies report toxicity of imidacloprid to Galendromus spp.. Moreover, in a laboratory experiment, imidacloprid exposure had a negative impact on functional responses of phytoseiid mites from other genera ( Neoseiulus and Phytoseiulus ) [40], and it is possible that foraging of Galendromus spp.…”

Section: Discussionmentioning

confidence: 99%

Neonicotinoid Insecticide Imidacloprid Causes Outbreaks of Spider Mites on Elm Trees in Urban Landscapes

et al. 2011

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BackgroundAttempts to eradicate alien arthropods often require pesticide applications. An effort to remove an alien beetle from Central Park in New York City, USA, resulted in widespread treatments of trees with the neonicotinoid insecticide imidacloprid. Imidacloprid's systemic activity and mode of entry via roots or trunk injections reduce risk of environmental contamination and limit exposure of non-target organisms to pesticide residues. However, unexpected outbreaks of a formerly innocuous herbivore, Tetranychus schoenei (Acari: Tetranychidae), followed imidacloprid applications to elms in Central Park. This undesirable outcome necessitated an assessment of imidacloprid's impact on communities of arthropods, its effects on predators, and enhancement of the performance of T. schoenei.Methodology/Principal FindingsBy sampling arthropods in elm canopies over three years in two locations, we document changes in the structure of communities following applications of imidacloprid. Differences in community structure were mostly attributable to increases in the abundance of T. schoenei on elms treated with imidacloprid. In laboratory experiments, predators of T. schoenei were poisoned through ingestion of prey exposed to imidacloprid. Imidacloprid's proclivity to elevate fecundity of T. schoenei also contributed to their elevated densities on treated elms.Conclusions/SignificanceThis is the first study to report the effects of pesticide applications on the arthropod communities in urban landscapes and demonstrate that imidacloprid increases spider mite fecundity through a plant-mediated mechanism. Laboratory experiments provide evidence that imidacloprid debilitates insect predators of spider mites suggesting that relaxation of top-down regulation combined with enhanced reproduction promoted a non-target herbivore to pest status. With global commerce accelerating the incidence of arthropod invasions, prophylactic applications of pesticides play a major role in eradication attempts. Widespread use of neonicotinoid insecticides, however, can disrupt ecosystems tipping the ecological balance in favor of herbivores and creating pest outbreaks.

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Section: Discussionmentioning

confidence: 99%

Neonicotinoid Insecticide Imidacloprid Causes Outbreaks of Spider Mites on Elm Trees in Urban Landscapes

et al. 2011

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“…In contrast, previous research with G. occidentalis found little evidence of spinetoram irritancy or repellency (Beers and Schmidt-Jeffris 2015); it appears that the effects of this pesticide may vary with population. Imidacloprid is known to be repellent to G. occidentalis (Bostanian et al 2009) and in our study (where mortality was calculated as dead ? runoff), runoff made a larger contribution to total mortality.…”

Section: Pesticide Toxicitymentioning

confidence: 99%

Comparative biology and pesticide susceptibility of Amblydromella caudiglans and Galendromus occidentalis as spider mite predators in apple orchards

Schmidt‐Jeffris

Beers

2015

Exp Appl Acarol

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The successful integrated mite management program for Washington apples was based on conservation of the mite predator Galendromus occidentalis (Nesbitt). In the 1960s, this mite was assumed to be the only phytoseiid in Washington commercial apple orchards, due to its preference for the most common mite pest of that period, Tetranychus mcdanieli McGregor, as well as its resistance to organophosphate pesticides. A recent survey of phytoseiids in Washington apple found that another phytoseiid, Amblydromella caudiglans (Schuster) has become common. It is a more generalized predator than G. occidentalis (it is not a Tetranychus spp. specialist) and is not known to be organophosphate-resistant. A series of experiments was conducted to compare the life history, prey consumption, and pesticide tolerance of these two species. Galendromus occidentalis developed more quickly than A. caudiglans, but had slightly lower egg survival. Although A. caudiglans attacked more Tetranychus urticae Koch eggs than G. occidentalis, it could not reproduce on this diet. Both predators performed equally well on a diet of T. urticae protonymphs. Unlike G. occidentalis, A. caudiglans experienced significant mortality when exposed to carbaryl, azinphosmethyl, and bifenazate. Both predators experienced significant mortality due to imidacloprid and spinetoram. These results highlight the key differences between these two predators; the shift away from organophosphate use as well as the change in dominant mite pest to Panonychus ulmi (Koch) may be driving factors for the observed increased abundance of A. caudiglans in Washington apple.

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“…Similar results have been obtained by other authors (James 2003;Villanueva & Walgenbach 2005;Bostanian et al 2009;Bostanian et al 2010), but completely opposite effects have also been described (James 1997;Castagnoli et al 2005). Because the combined use of predatory mites and imidacloprid could offer an interesting alternative for the management of citrus nursery pests, the aims of this study have been to firstly evaluate the effect of imidacloprid when applied as a drench on the demographic parameters of P. persimilis and N. californicus under laboratory conditions, and secondly to check the compatibility of imidacloprid and the release of these predatory mites in successfully managing citrus nursery pests under field conditions.…”

Section: Introductionsupporting

confidence: 92%

Gestión Integrada de la araña roja Tetranychus urticae Koch (Acari: Tetranychidae): optimización de su control biológico en clementinos

Argolo¹

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Gestión integrada de la araña roja Tetranychus urticae AGRADECIMIENTOSEn primer lugar mi más sincero agradecimiento a mis directores de tesis, los Drs. Alberto Urbaneja y Josep Anton Jacas por creer en mí y brindarme todas las oportunidades de formación, aprendizaje y promoción que estaban a su alcance. Por la paciencia y todo el esfuerzo para la realización de este trabajo y por estar siempre disponibles para echarme una mano. Os lo agradezco inmensamente. Me siento muy afortunada de haber trabajado estos años juntos a ellos.En especial, a mi gran amiga y compañera de tantos ensayos, dormidas y mal dormidas, risas, palabras de aliento… Tati Pina, con la que he tenido la suerte de contar en innumerables ocasiones para la realización de mis trabajos no sólo a nivel de ejecución si no de diseño, planificación, discusión, corrección de artículos y final de tesis, por su gran cualificación y compañerismo. Sin palabras para agradecértelo. Esta tesis te la dedico! A Generalitat Valenciana por concederme la beca Santiago Grisolía, y me gustaría agradecer en especial a los secretari@s Amparo González y Vicente Ruiz.Quiero expresar mi agradecimiento a la Universidad Politécnica de Valencia y al IVIA por mi aceptarme como alumna y por darme todo el apoyo durante mi estancia y para la realización de esta tesis. A Maite y Ana por toda la ayuda con los trámites de la tesis.A aquellos con que he podido contar para la corrección y evaluación de mi tesis, a las Dras.Raquel Abad y Maite Martínez Ferrer y al Dr. José Eduardo Belda. A éste último además, junto con el Dr. Javier Calvo, ambos de Koppert España S.L., por apoyarnos en el desarrollo de esta tesis y su provisión de fitoseidos para los ensayos.A mis compañeros y amigos: Raquel, María, Núria, Paloma, Consuelo, Marian, Lauriii, Molli, Dembi, Manu, al grande amigo José Catalán y Ato (por hacer más divertidos los muestreos); Miquel, Pablo Bru, Helga, Pilarín, Francisquinho, Sara, Tina, Cristian, por su ayuda, apoyo, y colaboración en los ensayos, por las clases de español y por compartir los buenos y malos momentos y principalmente por la amistad. En especial a mi gran amiga Vicky San Andrés, por su amistad, por la agradable convivencia, por su apoyo y, sobre todo, por el hombro amigo siempre que lo he necesitado. Ha sido un gran placer convivir con vosotros.viii Mi agradecimiento también a Pedro Castañera, Belén, Bea, Joel, Elena, Mª José, Mª Jesús, Alfonso, Paco por su ayuda y compañerismo.A todos mis amigos de Brasil y Valencia que participaron directa o indirectamente en la elaboración de esta tesis y que siempre estuvieron pendientes de mis logros en España.Esta tesis se la dedico también, a mis padres Eliel y Graça, y a mis hermanos por todo su esfuerzo, amor e incondicional apoyo. ix ABSTRACTThe two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is one of the most injurious pests affecting clementine orchards in Spain. In clementine trees, T. urticae inhabits the lower side of leaves where it produces silky webbing and dense colonies. It sucks t...

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Effect of seven new orchard pesticides on Galendromus occidentalis in laboratory studies

Cited by 46 publications

References 21 publications

Neonicotinoid Insecticide Imidacloprid Causes Outbreaks of Spider Mites on Elm Trees in Urban Landscapes

Neonicotinoid Insecticide Imidacloprid Causes Outbreaks of Spider Mites on Elm Trees in Urban Landscapes

Comparative biology and pesticide susceptibility of Amblydromella caudiglans and Galendromus occidentalis as spider mite predators in apple orchards

Gestión Integrada de la araña roja Tetranychus urticae Koch (Acari: Tetranychidae): optimización de su control biológico en clementinos

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