Effect of apple orchard floor vegetation on density and dispersal of phytophagous and predaceous mites in Utah

Alston, Diane G.

doi:10.1016/0167-8809(94)90126-0

Cited by 34 publications

(30 citation statements)

References 6 publications

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“…Specialists have a narrower diet range, shorter generation times, higher reproductive rates, and will aggregate on leaves where more prey are located 1 C (McMurtry and Croft 1997;Pratt et al 1999). Many, including N. fallacis, are eVective natural enemies of T. urticae (Westigard et al 1967;Meyer 1974;Johnson and Croft 1981;Croft and MacRae 1992;Alston 1994).…”

Section: Evects Of Predator Distributions In the Orchardsmentioning

confidence: 99%

“…Plant species were not noted, although the mix of vegetation was probably similar to that recorded by Hardman et al (2005) in a survey in 12-15 orchards in 2000-2001: the four broad-leaved plants (Taraxacum oYcinale Weber, Trifolium repens L., Plantago major L. and Hieracium spp. ), which predominated in laneways (49-66% of total cover), hosted all stages of T. urticae, whereas the cool-season perennial grasses (Agrostis, Festuca, Poa spp., 23-30% of total cover) were not favourable hosts for T. urticae (see also Meagher and Meyer 1990;Alston 1994). Laneway vegetation from each quadrat was clipped to ground level and placed in 22 cm tall £ 10 cm diameter paper cylinders in the laboratory.…”

Section: Sampling Mites In Ground Cover Vegetationmentioning

confidence: 99%

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Effects of acaricides, pyrethroids and predator distributions on populations of Tetranychus urticae in apple orchards

et al. 2007

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We sampled mites in three apple orchards in Nova Scotia, Canada, that had been inoculated with pyrethroid-resistant Typhlodromus pyri and had a history of Tetranychus urticae outbreaks. The objective of this study was to monitor populations of T. urticae and phytoseiid predators on the ground and in trees and to track dispersal between the two habitats. Pesticides were the chief cause of differences in mite dynamics between orchards. In two orchards, application of favourably selective acaricides (abamectin, clofentezine) in 2002, coupled with predation by T. pyri in trees and Neoseiulus fallacis in ground cover, decreased high T. urticae counts and suppressed Panonychus ulmi. By 2003 phytoseiids kept the tetranychids at low levels. In a third orchard, application of pyrethroids (cypermethrin, lambda-cyhalothrin), plus an unfavourably selective acaricide (pyridaben) in 2003, suppressed phytoseiids, allowing exponential increases of T. urticae in the ground cover and in tree canopies. By 2004 however, increasing numbers of T. pyri and application of clofentezine strongly reduced densities of T. urticae in tree canopies despite high numbers crawling up from the ground cover. Another influence on T. urticae dynamics was the distribution of the phytoseiids, T. pyri and N. fallacis. When harsh pesticides were avoided, T. pyri were numerous in tree canopies. Conversely, only a few N. fallacis were found there, even when they were present in the ground cover and on tree trunks. Low numbers were sometimes due to pyrethroid applications or to scarcity of prey. Another factor was likely the abundance of T. pyri, which not only competes with N. fallacis, but also feeds on its larvae and nymphs. The scarcity of a specialist predator of spider mites in trees means that control of T. urticae largely depends on T. pyri, a generalist predator that is not particularly effective in regulating T. urticae.

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Section: Evects Of Predator Distributions In the Orchardsmentioning

confidence: 99%

Section: Sampling Mites In Ground Cover Vegetationmentioning

confidence: 99%

Effects of acaricides, pyrethroids and predator distributions on populations of Tetranychus urticae in apple orchards

et al. 2007

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“…Other factors, such as cover-crop type, not much studied until now in French apple orchards could affect the Phytoseiidae diversity. Some studies in apple orchards but also in citrus orchards indeed showed exchange between plants in the interrows and trees (Alston 1994;Coli et al 1994;Nyrop et al1994;Tuovinen 1994;Stanyard et al 1997;Fitzgerald and Solomon 2004;Pereira et al 2006;Aguilar et al 2008Aguilar et al , 2011Mailloux et al 2010). Nothing is known on the occurrence in inter-rows of the main Phytoseiidae species found on apple trees.…”

Section: Resultsmentioning

confidence: 99%

Phytoseiid mite diversity (Acari: Mesostigmata) and assessment of their spatial distribution in French apple orchards

Tixier¹,

Lopes²,

Blanc³

et al. 2014

Acarologia

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“…Different studies on cover crops have proposed the use of some perennial grasses (Poaceae) because they are unsuitable hosts for phytophagous mites (Flexner et al 1991;Alston 1994;Barbosa 1998;Nyrop et al 1998) and specifically for T. urticae in clementine mandarin orchards . Recently, a mono-specific cover of the perennial grass Festuca arundinacea Schreber (Poaceae) has demonstrated to improve the regulation of T. urticae in clementine trees when compared with a wild cover or bare soil, both by reducing the successful settlement of T. urticae in clementine mandarin trees (Aguilar-Fenollosa et al 2011a) and by enhancing the populations of more efficient specialist predators relative to generalist pollen feeder predators (Aguilar-Fenollosa et al 2011b).…”

Section: Introductionmentioning

confidence: 99%

“…can increase rapidly and cause severe economic losses mainly due to fruit scarring (Ansaloni et al 2008). Ground covers can affect arthropod population dynamics and serve as reservoirs of natural enemies through provision of food sources when prey food is rare or absent, by supplying a shelter for overwintering or aestivation or a refuge from agricultural practices, and even for breeding (Alston 1994;Liang & Huang 1994;Jonsson et al 2008;Mailloux et al 2010). …”

Section: Introductionmentioning

confidence: 99%

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 apple orchard floor vegetation on density and dispersal of phytophagous and predaceous mites in Utah

Cited by 34 publications

References 6 publications

Effects of acaricides, pyrethroids and predator distributions on populations of Tetranychus urticae in apple orchards

Effects of acaricides, pyrethroids and predator distributions on populations of Tetranychus urticae in apple orchards

Phytoseiid mite diversity (Acari: Mesostigmata) and assessment of their spatial distribution in French apple orchards

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

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