Tea tree oil dilution??

[moldy]

OK, ladies - I need to make up some more tea tree oil (it's harvest season on the ranch - complete with barbed wire!). I know I need to dillute the tea tree oil with a carrier oil (have done it before), but I don't remember the ratio. Last time the ratio was printed on the bottle - this time, it says to consult a herb book (none of mine have this particular item).

 

Can one of you help me out, please?