How can I kill this type of beetle?

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It's my first time growing sunflowers and they're coming in beautifully. The problem is these beetles continue to get into the head of my sunflower and bore themselves in, eating the plant and leaving holes. I've tried dishwasher soap with water, and Captain Jack's deadbug dust AND chemical sprayer but they continue to come back despite treatments. Is there something I'm missing?

q how can i kill this type of beetle
q how can i kill this type of beetle
  10 answers
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