Predators
All Senecio, including S. squalidus, are considered food by some insects that like to eat the pyrrolizidine alkaloids they contain:
Flies
- Gall flies (Diptera: Tephritidae):
- Sphenella marginata
- Trupanea stellata
- Trypeta zoe
And other insects that are not listed here.
Fungi
Most Senecio, including S. squalidus are susceptible to rust and other fungus and mildews:
- Rust fungus Uredinales
- Coleosporium tussilaginis - (Coleosporiaceae)
- Puccinia lagenophorae - (Pucciniaceae)
- White rust Peronosporales
- Albugo tragopogonis - (Albuginaceae)
- Sac fungus Ascochyta, Pezizomycetes
- Ascochyta senecionicola - (Coelomycete)
- Powdery Mildew Erysiphales
- Podosphaera fusca - (Erysiphaceae)
And other fungi that are not listed here.
Read more about this topic: Senecio Squalidus