We also had our yard sprayed with Talstar but again they were in the garage for a few days after.
She was fine all day yesterday until about 6 pm when I found her. It appeared she’d just started acting weird then.
I don't want to create unnecessary worry or concern, but Talstar is a dangerous chemical where chickens are concerned. Talstar is toxic to pretty much everything.
How do I know it's toxic? We use it at our home and just applied it a few days ago, but only to areas our chickens can't reach, i.e. the front yard, but not the back. However, we lost a chicken when she found a few granules of Talstar in a side yard last year. We are pretty certain she ate a granule or two or three from some that was dropped out of the spreader by accident near where they free-range in the evenings, and it killed her by the next morning.
It's possible that your bird found a wedge of blades of grass that still had some liquid (you said it was sprayed on) Talstar in the "Y" or wedge of those blades of grass.
I've included photos of some pertinent areas of the labeling from a Talstar package that I just pulled from our recyclable trash.
Sorry, but I do NOT know how to treat for poisoning beyond what I've found and been told here on BYC, so I'm not an expert by any means. Here's treatment for ingested toxins on this forum:
https://www.backyardchickens.com/threads/flushes-for-aiding-in-toxin-removal.700526/
NOTE: @Wyorp Rock, @Eggcessive, @aart, @casportpony and others can likely help more in this area IF this is what has happened to your bird.
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