[SallyintNorth]

The NOAH Compendium says they are both 1.25%/12.5mg/ml cypermethrin. 
Does anyone have any thoughts/experience with Ectofly?

If NOAH says they're the same thing, then they are. 

I looked at the thread you linked; there was just one person saying Ectofly wasn't as effective as Crovect, and that not one of the regular contributors. 

If there is a difference in effectively, given the active ingredient is the same, then it could only be the applicator, couldn't it?  Crovect has three applicators, for three different uses, and it's essential to use the correct one for the circumunstances.  Is Ectofly the same?  Just went and looked at NOAH and it reads exactly the same as Crovect. 

[m3joeEm]

I use ectofly every year.  I was lucky and got a 5ltr bottle for 50 odd pound with a good date! Works well. It maybe just doesn't last as long as the others, 8 weeks maybe?

[shep53]

e author=Fleecewife link=topic=73766.msg587554#msg587554 date=1462814363]
  Which then is a 'good' chemical to use, or is there no such thing?
[/quote]    I would say all by the very fact that they are designed to kill insects then no .      Have you looked at RED TOP FLY traps     and   Barrier BLOWFLY REPEL  both recommended organic preventative

[shep53]

I've since been on farms that swear by that spot-on for sheep stuff.... and others that prefer the Vetrazin option... I think they were both at the more expensive end of the market though.

                                                                                                                                                                  COOPERS SPOT-ON  or the new SPOTINOR   both the same product  do not prevent blowfly but do treat