Ping for your expertise, Salamander. :)
From this day to the ending of the world,
But we in it shall be remembered-
We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother; be he neer so vile,
This day shall gentle his condition;
And gentlemen in England now-a-bed
Shall think themselves accursd they were not here,
And hold their manhoods cheap whiles any speaks
That fought with us upon Saint Crispins day.William Shakespeare, Henry V
***
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I’ll have to research it before commenting.
I have to be super careful because of Sighthound sensitivities to chemicals, not to mention my own issues with them.
For myself, I use a plain old Adams permethrin spray, treat the yard with permethrin and have these little glue/light flea traps and it all works well.