The little green inhabitants who festoon the likes of lavender and rosemary are nymphs from the sap-sucking common froghopper.
The female hopers lay their eggs on the green leaves in autumn which then overwinter and hatch in early May. They then cover themselves in foam-like substance to protect themselves against predators.
A way however to get their egg problem under control is by spraying a systematic insecticide on the bushes in early May. However, the frothy dots affecting the shrubs will cause minimal damage in a flower garden.
Minimising the effect that pests have on our gardens is something we all aim to do. Blue Iris Landscapes hope that this little article on Lavender Pest will help you if you have this problem in your garden. If you require any further information then please contact us.