History. New Room.
size 35 ft/L x 15ft/w x 12ft/h
Lights 15 X1000watt hps, 3 led fixtures about 4ft by 4ft.
Grow medium, Coco and vermiculite mix. Bucket size 4gallon. Top feed run to waste, run -off about 10 to 20%
Ferts, Yara and House and garden. Additional, have four rooms running, none of the other rooms have this issue.
First crop in this room showed no issues until about 2 to 3weeks in flower, then it spread from the back of the room to the front. The plants then all looks like they were covered in rust as it spread till harvest.
The second crop had a humidity issue in vege, dropped to about 30%, Repaired that, the once again have the same issue as before happening.
Thoughts… Humidity too low in veg, Calcium or potassium deficiency. As I’m using the same fertilizers in other rooms it’s hard to believe that.
Also, when humidity was low I moved two plants to another room and within 24hrs they were fine and are still fine in the room.
Actions, Have flushed, added Calcinet Nitrate. Checked pots run-off EC and PH. All seems ok.
Thinking there is an environmental issue. Perhaps a fungus or negative-positive pressure?
This is the second crop in this room.