Elle, it 'owrked' OK, and it even 'worked' well indeed!
I'm not convinced we are talking about same thing though -
'mines' are certainly no longer than 1mm, if that, and are black; I don't think they damage plants, but who knows!
As for ticks, as Doglet said, you can protect your pets (cats and dogs) by getting an anti-tick/flee collar, or by injecting yourself, usually on top of neck, a special product sold in vets, or here at least, also in pharmacist, in the animal care department. Ticks are extremely dangerous to animals (and human beings as well).
Re fires - a lot of picknickers are responsible for fires in the South of France in particular, and even sometime even set on purposely - which is really criminal.
Here, it is simply due to heat.