Black beetles ate my Rudbeckia flowers


(Wilmington NC)

Last summer tiny black beetles ate the flower buds off my blackeyed susans. By the end of the summer the some of the plants had died off completely. Last year I shook the buds over a bucket of plant oil to knock the bugs off to kill them. How do I keep the beetles from returning?


Doug says you may not be able to stop them from returning. But you can dust with diatomaceous earth to stop them from establishing themselves. If the DE doesn't stop them, dust the plants with Rotenone but do read the label on both - while they are effective, they can both create other issues for you.

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Black beetles ate my Rudbeckia flowers

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Little Black Beetles
by: Jan

I had the same problem with both my Oenethera - one pink and one yellow - in different areas of my yard. By the time I discovered them, they had eaten both leaves and flowers. The plants recovered when the beetles were gone. The next several years I really watched for them and they didn't come back for about 5 years and then attacked a different plant later in the summer.

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