Shower them off in the first place or take them off with your hand as much as you can. use clean water with 1/5 milk, or tea made out of this plant that stings you if you touch it, seriously forgot the name. but wouldnt recommend that if you have buds or your next problem is mold. Or your very careful with spraying.
Take care that they dont drop into your soil, put a protection over it so they dont get on the plant again. You can use SF-nematoads for your soilarea, they eat them there.
Seperate them from other plants.
You can use other insects for your leafarea, they will not damage your plant, but dont know how fast you can get them and if you get them how long it takes to breed them.
I dont know if there are any chemical products against them, but if you want to use them, read the description, they could be not sutable for consumable plants like cannabis, that you want to smoke. It can destroy your buds or change its flavour.