First factor that may have a bearing on this is the quality of the wood. Sometimes, if the spalting has gone too far the wood can be quite soft in places. In this case you are up against it a bit. However, a good coating of sanding sealer, then turn off with a freshly sharpened gouge when dry can sometimes help - repeating as necessary. But if the wood is too soft, i.e. not far off rotten then, I'm afraid, there's not much you can do to prevent the end grain fibres tearing out - don't even think 'scraper'!
If the wood is hard throughout then a very sharp gouge with very light cuts is the order of the day.