Orange spots, can't identify disorder...

[AGrow]

I have 4 plants with strange orange, yellow, grey spots starting in the lower leaves and working up the plant. The discoloration begins in the middle of the leaf, and causes the leaf tips to curl upwards. It happened before giving them nutrients, and it hasn't stopped after giving them a bunch of nutrients except for MAYBE one case. The plants are Mother's Finest (clone), Pure Kush (clone), PPP (clone of seed), and Cherry-Lime (Clone). The rest of the plants are from seed, and have no symptoms. The PPP is in a different cabinet in veg. still (could be seperate problem).

 

[MynameStitch]

Looks like you may have a pH issue going on, most of the veins of the leaves around have spotting effect and looks like it's locking out micronutrients like calcium.l

Can you fill out these questions below, the more questions the better.....

What is your pH you have? run off?

SOIL:

How long has this problem been going on?
What STRAIN are you growing?
What was the establishing technique? (seed or clone?)
What is the age of your plants?
How long have they been in the soil mixture they are in now?
How Tall are the plants?
What PHASE (seedling, vegetative or flower) are the plants in?
What Technique are you using? (SOG, SCROG etc)
What size pots are you using? (Include how many subjects to pot)
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)
What Nutrient's are you using?
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful*
How often are you feeding?
If flowering, when did you switch over to using Bloom nutrients?
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)
What is the TDS/EC/PPM of your nutrients used?
What is the pH of the "RUN-OFF"?
What method of pH test was administered? Using Strips? pH pen?
How often are you watering?
When was your last feeding and how often are you feeding?
What size bulb are you using?
What is the distance to the canopy?
What is your RH Factor? (Relative Humidity)
What is the canopy temperature?
What is the Day/Night Temp? (Include fluctuation range)
What is the current Air Flow? (cfm etc.)
Tell us about your ventilation, intake exhaust and when its running and not running ?
Is the fan blowing directly at plants?
Is the grow substrate constantly wet or moist?
Is your water HARD or SOFT?
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
Are you using water from a water softener?
Has plant been recently pruned, cloned or pinched?
Have any pest chemicals been used? If so what and when?
Are plant's infected with pest's?

 

[jyme]

it doas look like a ph problem and ph is the most important thing about plant health

 

[AGrow]

I bought a damn ph meter and it always reads btwn 7-7.5, even when I dipped it in vinegar. I'm returning it tomorrow.

Anyways, yeah what would a plant look like when exposed to to much CO2?? As in CO2 intoxicated plants, because that may be my problem too...

 

[AGrow]

Well it turns out what I've been watering my plants with has a very low pH, so I will increase it the next time I water.

However, I'm still wondering about the CO2 exposure and what cannabis looks like when it gets too much CO2. The problem is getting worse... wtf is it?

 

[choch]

Your plants will continue to worsen until you get the ph in the soil back to the correct range.

 

[jyme]

just checking back in to see how your plants are doing did you ever get the ph problem fixed and ive went threw a couple of those cheap ph meters and even if you get it to work i dont trust them not when all the well being is depending upon the ph i found one that works went threw three to get one and by then i had ph strips and fish ph test so im certan that it is what it reads the ph is the key to all the plants health it doesnt matter what eles you do if its wrong what you do is wrong or useless