Dude are you going to spray it on your bud!?I'd use it in veg, but I wouldn't spray it on bud?
I've got it stopped already via baking soda/neem sprays and sulfur burns, but any leaf already infected is going to die
the prevailing thought is to remove affected leaves at the first sign, but when I get it stopped I leave them to help get the plant further along and to get new leaves growing which have no necrosis
I'm not recommending this, I'm just saying that's what I do and it seems to give best results in my situation. The exception is if I see a healthy plant with only one or two necrotic spots I will remove those leaves immediately