One should not use spinosad on buds (fine in veg), it is not known to be safe, it could be but no tests have been done, please be safe.
I use ISO (rubbing alcohol) mixed with water 8 parts water to 1 part ISO (I go 50/50), spray the underside than the top and soak them good, the ground/soil pot wall everything with lights off. This like spinosad is a contact killer, they will not kill eggs so they have to be redone every 3 days for 3 treatments. Then watch closely.