Dahlia Destroying Insects - Knowledgebase Question

Oakland, CA
Avatar for jubilee
Question by jubilee
April 17, 2001
For years, I've tried to grow Dahlias, but they
are destroyed before maturing, I think, by a
green bug with black dots that otherwise looks
like a ladybug. Can you tell me what it is & how
to deal with it?

Answer from NGA
April 17, 2001
I'm only guessing without seeing the pest, but you may be dealing with Mexican Bean Beetles. Mexican Bean Beetles can be formidable foes. There will be one to three generations per year, so destroying egg clusters during the growing season will help reduce subsequent populations. Organic solutions include planting nasturtiums, garlic, marigolds or rosemary along with your dahlias. Be sure to clean up plant debris at the end of the season so adults won't have a place to hide. You might also try growing a variety of plants to attract predacious wasps and assassin bugs, who dine on Mexican Bean Beetles.

Finally, if possible, move your dahlias to a different garden bed this year. This will help them avoid attacks from overwintering insect pests.

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