Can't tell all that much from the picture....but could be thrip shit. Read this thread to see if that helps.

http://boards.cannabis.com/plant-pro...hrip-shit.html

Good luck,
HMR
Horsemanrocks Reviewed by Horsemanrocks on . not sure how this works, but need help with my plant my plant is just starting to bud a few weeks ago, but these leaves have been slowly wilting for a few months now. any ideas how to stop this process? and also if they have negative influence on the plant should i clip them off? any information is helpful still very new at this. Rating: 5