You attached a huge binary to that post John. That's a nono. This isn't a
binary newsgroup. You should post the photo somewhere else and provide a
link to it.
In answer to your question though I would say this. To me the damage looks
like grubs, but could be some other insect, depending on where you live.
The lawn doesn't care if it's been poisoned or not btw. Only people do.
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