bioRxiv preprint doi: https://doi.org/10.1101/2020.11.09.374504; this version posted April 16, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Impact of the pear psyllid Cacopsylla pyri host instar on the behavior and fitness 2 of the parasitoid Trechnites insidious 3 4 Guillaume Jean Le Goff1*, Jeremy Berthe1, Kévin Tougeron1, Benoit Dochy1, Olivier Lebbe1, 5 François Renoz1 & Thierry Hance1 6 7 1 Earth and Life Institute, Biodiversity Research Centre, UCLouvain, Croix du sud 4-5 bte L7.07.04, 8 1348 Louvain-la-Neuve, Belgium 9 10 11 *Corresponding author: Guillaume Jean Le Goff (E-mail address:
[email protected]) 12 13 14 15 16 17 18 19 20 21 22 1 bioRxiv preprint doi: https://doi.org/10.1101/2020.11.09.374504; this version posted April 16, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 23 Abstract 24 1. Pear is one of the most important fruit crops of temperate regions. The control of its mains pest, 25 Cacopsylla pyri, is still largely based on the use of chemical pesticides, with all that this implies in 26 terms of negative effects on the environment and health.