Does it look a bit like this?
This is on a JBP I nearly lost due to over damp soil conditions a couple of years back. Most of it's roots had rotted (95%) but it stopped deteriorating after a repot. It hardly grew last year putting out tiny candles. This year the candles are bigger (still small to medium) but I believe the tree still to be stressed and in recovery as it's developed the symptoms of needle cast. I understand the needles are doomed once infected but fungicide spraying can prevent spread to new needles. I hope so. I've sprayed mine and all my other (apparently healthy) pines as a precaution.