white surface on sugar leaves

I noticed this happening on one of my outdoor grape fruit plants. Does anyone know what this is? is it worth keeping?
additional info: there is alot of powdery mildew in my area, there doesn't seem to be any on the plant, but that's my main suspect so far.

 

Upon further inspection there definitely seems to be something on there. It is a smaller plant so i am going to rinse it in an h2o2 solution when I harvest, and if it floats out its probably pm, but if not I'm sure I'd be able to separate it in bubble bags.


It seems to be like some crystalline structure, that to me, looked a little different than powdery mildew on a different kind of plant in a different spot of my property. Didn't take a picture but pm seemed to be longer, strands almost .

 

Compared to everything else in my yard no there may be a tiny bit on the side the gets more wind, but this bud was taken from the other side, with no sign. I did notice some cabbage loop worms eating stigma hairs, on another plant but they were quickly eradicated. Maybe a larger one sat there and had a snack for a while and messed up some headdies. It looked as oily as the resin heads it self

 

Nah, im sure its not spilled nutes. Organicly, mixed my soil last fall only added a little worm castings and guano, sprayed with aact during veg and a little BT during flowering, but no other plants had a reaction like this.


Thanks for the feed back everyone!