Even though once pyrethrum flowers are dried and ground they are one of the world's best insecticides, while pyrethrum is grown it is as susceptible to insects as any other growing crop.

The most harmful insects to pyrethrum crops include:

  • Thrips
  • Flower Thrips
  • Green Peach Aphids
  • Red Spider Mites
  • Nematodes

Usually insects don't cause as much harm to pyrethrum crops as fungi do.  Insects tend to be the most harmful to pyrthrum crops during dry seasons.