I read a whole description of azetrol and its uses and I myself use the product. I spray it with no worries, no gloves, resperator, ect ect I just wash my hands after.
*They suggest 1/2 tsp per quart.*
I generally use more like 1 tsp per 1/2 to 3/4 of a quart.
The way it works is your plant eats it, the mite eats the plant and clogs it up making it unable to eat anylonger.
*Suggested use is spray on once, wait 5-7 days, and do again. Then every 10-14 days after and no spray after 2 weeks into flower.*
My use is a little different personally, I use it in the veg stage everytime I use the foliar spray (2 times a week) and I mix it all together, then in flower I use for first 2 weeks and if I get 4 weeks in and really need to use it I will but with very VERY good air circulation and direct blow on fans (all to prevent mold).
*I would never use it withing the last 2-3 weeks of flower no matter how desperate.*
at one time I had a whole page about the product and really good info, I thought I found it by just googling it but it was a long time ago and I can't find it, the suggested usage above I'm pretty sure is right but DISCLAMER I make mistakes!
The page also did mention putting it in as feed in the soil as well as dipping so I'm sure its safe for all. As far as the saftey when spraying the product I don't recall it saying anything about it, but that doesn't mean in 10 years I won't be back here posting about azetrol and cancer or something!