Invasive ladybird has biological weapon

@article{Yong2013InvasiveLH,
  title={Invasive ladybird has biological weapon},
  author={Ed Yong},
  journal={Nature},
  year={2013}
}
  • E. Yong
  • Published 16 May 2013
  • Biology
  • Nature
The harlequin ladybird carries a parasite that causes it no harm but kills other native species. 

References

Invasive Harlequin Ladybird Carries Biological Weapons Against Native Competitors
TLDR
It is proposed that intraguild predation, representing a major selective force among competing ladybird species, causes the infection and ultimate death of native ladybirds when they feed on microsporidia-contaminated Harmonia eggs or larvae.