Fly spot-on ingredients, any chemists out there?

[LittleBlackMule]

Switch Equine - 4% permethrin.
Coopers Spot-on - 1% deltamethrin.

Which do you think should be the most effective?

 

[jennywren07]

Mil is a pest controller and says permethrin is Prefrable as its a natural pyrethroid. The above is good concentrate

 

[LittleBlackMule]

Thanks. Interesting, as the Switch is cheaper!

 

[jennywren07]

Although she is looking at it from a pest control point of view so maybe to do a spot test just incase of sensitivity

 

[LittleBlackMule]

Although she is looking at it from a pest control point of view so maybe to do a spot test just incase of sensitivity

Will do, although my poor donk has so many bald patches from the midges I don't think any more would make a difference!