Chicken Feather Loss?

[Poliwag1]

For the past 2 days one of my Langshan chickens, Coconut, has had a lot of feather loss. Should this be a concern? It started on the 22 when I gave them all pesten powder for their mite issues, they never usually have a reaction, but I noticed it when I ruffled it in Coconut's back feathers. Since, a lot of loose ones fall out when she shakes her back or when I pick her up. Molting or concern?

 

[Poliwag1]

Sorry for the blurry photos

 

[Loving my girls]

My initial thoughts are Do you have a cockerel ? It looks like too much adoration at first sight.

HOWEVER
I have just been researching the product contents, this is what I found in a nutshell …

1. Banned in a number of countries due to environmental damage.
2. A neurotoxin linked to Parkinson’s disease.
3. Causes cell damage which is what affects the lice.
4. Mask is recommended for all usage as it contains Rotenone.
5. Australia used it to kill all the fish in a lake due to an invasive species.
All information was researched on Google so take its validity as you wish

Having found this out I suspect that a reaction is likely.

 

[Poliwag1]

My initial thoughts are Do you have a cockerel ? It looks like too much adoration at first sight.

HOWEVER
I have just been researching the product contents, this is what I found in a nutshell …

1. Banned in a number of countries due to environmental damage.
2. A neurotoxin linked to Parkinson’s disease.
3. Causes cell damage which is what affects the lice.
4. Mask is recommended for all usage as it contains Rotenone.
5. Australia used it to kill all the fish in a lake due to an invasive species.
All information was researched on Google so take its validity as you wish

Having found this out I suspect that a reaction is likely.

Do you think I should help her to treat it? Or will it naturally stop and let her feathers grow?