What's That Bug? does not endorse extermination

Subject: Beetle on Coreopsis grandiflora in late May, Ontario
Location: Ottawa, Ontario
May 26, 2013 12:28 pm
Hi Bugman,
I returned from a week away to find my garden in full bloom, and these bugs, beetles I think , covering the flower buds and in the leaf axils of 2 Coreopsis grandiflora that I planted in my garden about a month ago , obtained from a local nursery, that gets them from elsewhere I am sure.
I would like to know what they are, I think they seem intent on eating the foliage.
I have also notesd that where they were planted is too moist, the plants have powdery mildew which may be predisposing them to attack by bugs.
My garden is in Ottawa, Ontario, season late spring.
Here are some photos. Shall I pick and destroy. Or leave them be?
Signature: merrivet

Ragweed Leaf Beetles

Ragweed Leaf Beetles

Dear merrivet,
These are Leaf Beetles in the family Chrysomelidae.  We believe them to be in the genus
Zygogramma, and we believe they might be Ragweed Leaf Beetles, Zygogramma suturalis. According to bugGuide:  “Food host: ragweed (Ambrosia, Asteraceae).”  Coreopsis is in the family Asteraceae.  We will be leaving town in early June and we are postdating your submission to go live next week.  

Ragweed Leaf Beetles

Ragweed Leaf Beetles

What's That Bug? does not endorse extermination
Location: Ottawa, Ontario, Canada
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One Response to Possibly Ragweed Leaf Beetle

  1. Ottawa Gardener says:

    Yeah, I think it’s coreopsis beetle. I have them too this year.

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