They've ruined my rosemary bush and have started to spread to the sage.
What can I do about Rosemary Leaf Beetles?
Ugh, these are nasty, aren't they?! Here's some different ideas:
Organic
-Regular observation in late spring each year is essential to prevent infestations establishing.
-Removing adults and larvae by hand will help to reduce numbers. Shaking infested bushes over an old towel or sheet will enable large infestations to be collected and removed.
-Netting and fleeces can be used to stop adults moving between plants.
-There are currently no natural enemies commercially available to control rosemary leaf beetle.
Prevention
-Check plants on a weekly basis for signs of infestation and deal with them as soon as they appear.
-Encourage insectivorous birds by hanging feeders in the winter and provide nesting boxes in the spring.
Some chemicals you can try are:
Imidicloprid
Bifenthrin
Pyrethrum
Natural fatty acids
Surfactant-based products
Goodluck!
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