I have free range backyard chickens. They have had chiggers in the past and used carbaryl and it worked?

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Yum, tomato.

Question by Mr. Peanut: I have free range backyard chickens. They have had chiggers in the past and used carbaryl and it worked?
Is it likely this is seasonal and they should get dusted on a regular basis?

What are other methods of controlling chiggers?

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