Heres a little guide a found from a member on another forum. I am sorry about your crop being in danger man!
"Fill the cup half way with sulfur, this will last awhile.
put the cup on the lowest setting.
Put the burner 3 feet above the plants in the middle of your room.
Turn off all ventilation and fans in the room,if you don't turn of the vents the sulfur won't stay in the room. if you leave fans blowing on your plants it can burn them.
Burn in the middle of the dark cycle if it 12/12 then start it at 4 hours into the dark cyle and burn for 4 hours. This is because the plants stomatas are closed.
For active mold use it 3 time a week for 4 hours. for regular maintenance use it 4 hours one time a week."