@M4ur @bob31 Response to trouble shooting form, and picture updates below. PLEASE NOTE* since you asked this question the youngest and smallest plant has also began to show discoloration and signs of stress. However the physical damage looks different than the original plant in question. Other than the strain of auto flower, the filled out Q&A form below can be applied to both plants.
i’m sure you could provide better insight but right now my 3 suspects are:
- pH problems
- Heat stress/temperature problems
- Insect problems
—> Strain of sick plant is AK-47 Autoflower. Smaller plant is an unknown autoflower, most likely northern lights or blueberry. Both are from ILGM.
Soil in pots, Hydroponic, or Coco?
System type?
—>Pot
Pot mixture—> 50% magic dirt potting soil (A renewable biomass soil product/not actually dirt, more like recycled cow dung)
—>20% coco husk/peat moss(miracle Gro ‘hydrate’)
—>20% generic potting soil (EarthGro potting soil mix)
—>10% added miracle Gro perlite
PH of runoff or solution in reservoir? → NA (decided not to incorporate pH into the grow this time because I have not done it before and I have heard that using soil acts as a pH buffer already and adjusting the pH could actually hurt the balance of the soil pH, especially if you’re new to dealing with pH. The Ph is unknown so I’m thinking pH is my suspect #1
What is strength of nutrient mix?
—>Magic dirt nutrient mix-
N= 1.05%
P= .3%
K= .35%
→ having trouble finding the NPK ratios of all the soil types I used because I mixed so many different types there’s really no telling what the real balance of nutrients Is.
EC, or TDS → again don’t have the tool for pH EC or TBS
Indoor or Outdoor—> indoor
Light system, size?
—> 4 LEDs totaling around 650 actual watts
Temps; Day, Night —> hovering within 75 to 83° /averaging at 80°
Humidity; Day, Night —> mid 70s (normal) …sometimes higher when the door is closed for too long but only briefly. If I do have heat stress then humidity could also be a factor as I’m not sure how hot and humid the closet gets when the door was closed for those few hours each day. (as of last week though I am now always keeping door slightly ajar when away)
AC, Humidifier, De-humidifier,
Co2; Yes, No
—> adequately & ‘naturally’ ventilated…not worried about smell so I keep closet door usually open (have a dog so sometimes door was closed for few hours at a time while at work, but only for the first week or 2…again, It might have gotten a little too hot the first couple weeks so now always keeping door at least partially cracked when away)…heat stress?? Another possible culprit?? I’m also thinking this because distressed plant is the furthest away from the door which is providing the ventilation which means this plant is probably experiencing a little bit higher temperatures than the other two.
Suspect #2 - heat stress
— One of the bags of potting mix I had reused from the last grow… That being said I have encountered an extraordinary amount of fungus gnats in the grow area particularly in the plant that is looking stressed or dis-colored (towards the back)…so my third and final suspect is an insect problem possibly with these fungus gnats… I’m thinking this because there’s no way I can have this many gnats wen I have not been overwatering. In fact I’ve only watered two major times other than when I first planted them…so if I have been watering correctly and still have a large amount of fungus gnats, something tells me that they got into the already open soil bag, which was sitting outside for a while before I used it…it wasn’t completely airtight just rolled up and pinched with a clothes pin like a bag of chips and a chip clip… not to mention I’ve let the soil dry and then moistened the top layer with hydrogen peroxide and distilled water several times over and I still have a pretty bad gnat problem…
They haven’t seemed as bad in the smaller plant however so my insect theory, at least the gnat part I’m hoping isn’t an issue with the smaller plant…can’t say for sure tho because there’s always a spider more possibility…The spotty discoloration/damage shown on the smaller plant looks very similar to the damage spider mites cause…ugh!!
At least I can say they still seem to be growing at a decent rate…The biggest and most healthiest plant is also in the best lighting spot which is the only reason I think it’s bigger than the other similar sized plant. The biggest one also got a few days of a Head start over the second biggest…ugh! Help!?!
B. ---->9/22 updates below<-----
edited by latewood - admin, removal of unapproved commercial link. Images as I posted are OK without actual links or company dotcom links. 
