Spider mite

Ok so here is my problem,I am 3weeks into flowering and have just noticed on one of my plants a few spider miteGrrrrr.I would not say it is at the Infestaton stage yet though.I have neem oil but was wondering if anyone knew exactly hot to use it.I am parnod about spraying it as it has started to bud.Where do these mites come from?I cleaned my room and bug bombed them at the veg stage.I really dont want to lose them at this stage.I NEED ADVICE PLEASE.............

dont use neem oil much past 2 weeks into flowering stage. I would go to your local home depot and get a hot shot bug control unit. They usually have vents on them and ward off a variety of bugs. Don't use these if your grow setup is near a commonly trafficked area such as a living room or closet as it is harmful to humans after extended exposure. They are about $5

Thanks mate i will get right on to that....