The Science of Nature

, 105:20 | Cite as

Effects of environmental parameters on the chestnut gall wasp and its complex of indigenous parasitoids

Original Paper

Abstract

The chestnut gall wasp (CGW), Dryocosmus kuriphilus, an invasive pest native to China, has caused severe yield and economic losses to chestnut production in Europe since its arrival in 2002. In Southern Italy, the complex of indigenous parasitoids colonizing CGW was monitored between 2013 and 2015, with the aim of estimating the composition of the indigenous parasitoid complex, its ability to control CGW populations, and the interactions of both factors with several measured environmental parameters. We compared results among three differently managed field types. Results showed an increase in the rate of parasitism both when the host population density was lower and in unmanaged chestnut stands with more natural conditions. The percentage of parasitism in galls was related to morphological traits of the galls and to higher seasonal temperatures, which reduced the parasitism intensity because CGW develops earlier under such conditions. The host–parasitoid mortality inside galls varied among sites and was associated mostly with rot fungi during wet spring and summer months. Parasitoid species richness was similar among the study sites, but the proportion of parasitoid species differed between orchards and unmanaged coppice stands. The timing of attack by parasitoids followed a species-specific successional sequence throughout the larva-to-adult life cycle of the CGW. These interactions should be considered in future research on trophic relationships and when modeling invasive scenarios for new pest species.

Keywords

Chestnut Cynipidae Dryocosmus kuriphilus Gall Host–parasitoid–environment Phenology 

Notes

Acknowledgements

We would like to thank Russo Diego and Vono Gregorio for support with monitoring and Chiara Ferracini for contributing to insect identification. We are grateful to Lorenzo Covarelli and Laura Tosi from the University of Perugia for isolating and identifying fungi from galls and to Giovanni Spampinato from Università Mediterranea of Reggio Calabria for identifying plant species.

Author contributions

CPB and UB conceived and designed research. CPB conducted experiments. CPB and UB analyzed data. CPB and UB wrote the manuscript. All authors read and approved the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

114_2018_1545_MOESM1_ESM.docx (5.3 mb)
ESM 1 (DOCX 5396 kb)

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© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratorio di Entomologia ed Ecologia Applicata, Dipartimento Patrimonio, Architettura, UrbanisticaUniversità Mediterranea di Reggio CalabriaReggio CalabriaItaly
  2. 2.CNR, Institute for Sustainable Plant Protection, SS of PorticiPorticiItaly

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