Range-expansion in processionary moths and biological control

Jetske G. De Boer*, Jeffrey A. Harvey

*Corresponding author for this work

    Research output: Contribution to JournalReview articleAcademicpeer-review


    Global climate change is resulting in a wide range of biotic responses, including changes in diel activity and seasonal phenology patterns, range shifts polewards in each hemisphere and/or to higher elevations, and altered intensity and frequency of interactions between species in ecosystems. Oak (Thaumetopoea processionea) and pine (T. pityocampa) processionary moths (hereafter OPM and PPM, respectively) are thermophilic species that are native to central and southern Europe. The larvae of both species are gregarious and produce large silken ‘nests’ that they use to congregate when not feeding. During outbreaks, processionary caterpillars are capable of stripping foliage from their food plants (oak and pine trees), generating considerable economic damage. Moreover, the third to last instar caterpillars of both species produce copious hairs as a means of defence against natural enemies, including both vertebrate and invertebrate predators, and parasitoids. These hairs contain the toxin thaumetopoein that causes strong allergic reactions when it comes into contact with human skin or other membranes. In response to a warming climate, PPM is expanding its range northwards, while OPM outbreaks are increasing in frequency and intensity, particularly in northern Germany, the Netherlands, and southern U.K., where it was either absent or rare previously. Here, we discuss how warming and escape from co-evolved natural enemies has benefitted both species, and suggest possible strategies for biological control.

    Original languageEnglish
    Article number267
    Pages (from-to)1-15
    Number of pages15
    Issue number5
    Early online date28 Apr 2020
    Publication statusPublished - May 2020


    • Biodiversity
    • Enemy-release hypothesis
    • Forest
    • Global change
    • Invasion
    • Lepidoptera
    • Pest insect
    • Public health
    • Urticating setae


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