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Factors influencing citrus fruit scarring caused by Pezothrips kellyanus

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Abstract

Kelly’s citrus thrips (KCT) Pezothrips kellyanus (Bagnall) (Thysanoptera: Thripidae) is a recently recorded cosmopolitan citrus pest, causing fruit scarring that results in downgrading of fruit. Due to the detrimental effects caused on fruits by KCT, we wanted to study some of the factors influencing fruit scarring. Specifically, the objectives were: (1) to determine the fruit development stage when citrus fruits are damaged by KCT and the population structure of KCT during this period, (2) to study the influence of temperature on intensity of damage, and finally, (3) to identify alternative host plants. KCT populations on flowers and fruitlets and alternate plant hosts were sampled in four citrus orchards from 2008 to 2010. The percentage of damaged fruits was also recorded. The exotic vine Araujia sericifera (Apocynaceae) was recorded as a new host for KCT. Thrips scarring started to increase at 350–650 degree-days (DD) above 10.2 °C, coinciding with a peak abundance of the second instar larval stages over all 3 years of the study. The maximum percentage of larval stages of KCT was observed in the 3 years at about 500 DD, a period which corresponds to the end of May or early June. Variation in the severity of fruit scarring appeared to be related to air temperature. Temperature likely affects the synchronisation between the peak in abundance of KCT larvae, and the period when fruitlets are susceptible to thrips damage. Temperature can also influence the survival and development of KCT populations in citrus and other host plants in the citrus agro-ecosystem.

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Acknowledgments

The authors thank Alejandro Tena for his valuable suggestions and two anonymous referees for their careful review and helpful comments. We also extend our thanks to the owners of the commercial orchards for giving us permission to use their citrus orchards. The first author was awarded an FPI fellowship from the Polytechnic University of Valencia to obtain her PhD degree.

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Authors and Affiliations

  1. Instituto Agroforestal Mediterráneo (IAM), Universitat Politècnica de València, Camí de Vera S/N, 46022, València, Spain

    Cristina Navarro-Campos, Apostolos Pekas, Amparo Aguilar & Ferran Garcia-Marí

  2. R&D Department, Biobest Belgium N.V., IlseVelden 18, 2260, Westerlo, Belgium

    Apostolos Pekas

Authors
  1. Cristina Navarro-Campos
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  2. Apostolos Pekas
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  3. Amparo Aguilar
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  4. Ferran Garcia-Marí
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Correspondence to Cristina Navarro-Campos.

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Communicated by L. Shipp.

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Navarro-Campos, C., Pekas, A., Aguilar, A. et al. Factors influencing citrus fruit scarring caused by Pezothrips kellyanus . J Pest Sci 86, 459–467 (2013). https://doi.org/10.1007/s10340-013-0489-7

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