9 weeks into flowering and this shows up. Need some help please
Sorry to say but it looks like mold to me. Hopefully a bit more experienced grower can chime in soon
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That looks like mold. If it’s on the one branch I would take a bag and very very carefully cover it and chop off the infected branch, then check the rest of your crop. If nothing else is infected I would do a bud wash when you chop and disinfect everything because those spores spread like wild fire.
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To add to what @MadamCalamity said, get your RH lowered and improve your air circulation.
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My heart sank as I saw that first pic. I have had that happen too and its awful.
Dry air, Thats the way. Cant fix it, you have to prevent it.
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Very sorry to see that.
What’s your temps and humidity? What does your fan situation look like?? Maybe with some tweaking this can be prevented in the future.
We around here like to see your hard work go up in smoke, not like this.
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To much RH and warm temps imo ,my noob opinion when growing outdoors this is what I battled along with the dreaded Bud rot and when it was humid no breeze and warm at nights it would rear its ugly head
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Like @Spiney_norman felt. When i viewed this i said to myself, oh no!!! I feel so bad. I know the hard work that goes into it and have something like this come about. Keep fighting growmie! 
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I would be the guy out there in the middle of the night with a hundred foot of extension cord stretched out holding a box fan on them. 
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I have been in the situation similar to this. I had bud rot. I added a dehumidifier to the mix. It’s been great. 
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Happy Cannaversary Grow Bro 
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I open my tent on pins and needles every day hoping thats not on the other side 
. Bad outdoor memories.
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