Percent of Japanese beetle adults having at least one I. aldrichi egg on their pronotum as a function of degree-days (> 10 °C). Counts were made from 2019 to 2023 on: A. Seyval Blanc; and B. Vidal foliage.

 
 
  Part of: Lasnier J, de Coussergues C-H, Baril A, Vincent C (2025) Abundance of Japanese beetle adults and its parasitoid Istocheta aldrichi in a Quebec commercial vineyard. Bulletin of Insectology 78: 1-10. https://doi.org/10.3897/bull.insectology.152754