Nosema?

Lately there are brown streaks on the top and two sides of my hive - this is a new package (just a month in the hive) that I'm feeding 1:1 syrup and Honeybee Healthy - they seem vigorous, but I'm worried about this and want to make sure I do the right thing.

Attachment 1857
(click for bigger)

Dysentery occurs anytime the bees are confined. It does not necessarily mean they have nosema.

http://www.bushfarms.com/beesnosema.htm

I had my cars parked in front of my hives on the first warm day of spring. I had that type mess all over the cars. Strangely hard to wash off.

My beekeeping instructor says it's probably tree resin that they're bringing in....which would explain the difficulty of it washing off...