Navarro Campos, C.; Aguilar Martí, MA.; Garcia Marí, F. (2012). Aggregation pattern, sampling plan, and intervention threshold for Pezothrips kellyanus in citrus groves. Entomologia Experimentalis et Applicata. (142):130-139. doi:10.1111/j.1570-7458.2011.01204.x
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/64311
Title:
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Aggregation pattern, sampling plan, and intervention threshold for Pezothrips kellyanus in citrus groves
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Author:
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Navarro Campos, Cristina
Aguilar Martí, Mª Amparo
García Mari, Ferran
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UPV Unit:
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Universitat Politècnica de València. Instituto Agroforestal Mediterráneo - Institut Agroforestal Mediterrani
Universitat Politècnica de València. Departamento de Ecosistemas Agroforestales - Departament d'Ecosistemes Agroforestals
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Issued date:
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Abstract:
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[EN] Pezothrips kellyanus (Bagnall) (Thysanoptera: Thripidae) has recently emerged as an international pest of citrus. It causes severe scarring of the fruit surface and commercial downgrading of fresh fruit production. ...[+]
[EN] Pezothrips kellyanus (Bagnall) (Thysanoptera: Thripidae) has recently emerged as an international pest of citrus. It causes severe scarring of the fruit surface and commercial downgrading of fresh fruit production. The goals of this article were to determine the aggregation patterns of P. kellyanus on citrus, to establish an efficient sampling plan to assess their population density, and to develop an environmental economic injury level (EEIL). The study was conducted in 14 citrus groves in Valencia (Spain) during 2008 and in eight citrus groves during 2009. On each grove, population densities of thrips were monitored weekly on citrus flowers and fruitlets during the flowering and fruit setting period. Final damage was determined on developed fruits. Pezothrips kellyanus was the most abundant thrips species, with 73.5% of adults and 92.1% of larvae present, followed by Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), with 18.2 and 3.5%, respectively. First description of first instars of P. kellyanus is provided. Our results prove that thrips show clumped population distributions, with no differences in aggregation parameters between flowers and fruitlets, thrips species, larval stages, or sex of adults. Immature thrips showed a higher aggregation (Taylor's value of b=1.40±0.06) than adults (b=1.19±0.04). Fruit damage by P. kellyanus on developed fruits was strongly correlated with percentage of fruitlets with immature P. kellyanus (r=0.897; n=22). Based on the percentage of fruitlets occupied by immature thrips, the economic injury levels and EEIL were calculated (using chlorpyrifos as insecticide) obtaining values of 7 and 12%, respectively. Insecticide treatments will be necessary if more than 12% of fruitlets are infested by thrips larvae. Constant precision (D=0.25) sampling plans developed show that 200 sample units should be observed in enumerative sampling, and 310 in binomial presence-absence sampling, at population levels of immatures on fruitlets around the EEIL. © 2011 The Authors. Entomologia Experimentalis et Applicata © 2011 The Netherlands Entomological Society.
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Subjects:
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Citrus thrips
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EEIL
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EIL
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Frankliniella occidentalis
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KCT
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Larvae description
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Monitoring
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Sample size
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Taylor's power law
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Thripidae
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Thysanoptera
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Abundance
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Aggregation behavior
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Agricultural production
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Assessment method
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Chlorpyrifos
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Crop damage
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Developmental biology
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Economic analysis
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Environmental monitoring
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Evergreen tree
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Fruit
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Injury
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Mathematical analysis
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Pest control
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Pest species
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Plant-herbivore interaction
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Population density
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Population distribution
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Threshold
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Thrips
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Comunidad Valencia
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Spain
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Citrus
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Frankliniella
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Copyrigths:
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Reserva de todos los derechos
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Source:
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Entomologia Experimentalis et Applicata. (issn:
0013-8703
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DOI:
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10.1111/j.1570-7458.2011.01204.x
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Publisher:
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Wiley
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Publisher version:
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https://dx.doi.org/10.1111/j.1570-7458.2011.01204.x
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Project ID:
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Universitat Politecnica de Valencia
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Thanks:
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We thank Apostolos Pekas for his useful comments on previous versions of the manuscript. We also thank the citrus producers who provided the orchards for the study. Finally, we are grateful to two anonymous referees for ...[+]
We thank Apostolos Pekas for his useful comments on previous versions of the manuscript. We also thank the citrus producers who provided the orchards for the study. Finally, we are grateful to two anonymous referees for their careful review and helpful comments. The first author was awarded an FPI fellowship from the Universitat Politecnica de Valencia to obtain her PhD degree.
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Type:
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Artículo
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