Autos: Black spots and burning tips and discoloration

Shiranui

Member
Dear Community,

I would appreciate if you could help me out here (pictures attached). There is discoloration of the leaves, black spots appearing, leaf tips discoloring, and some are yellowing, drying out and falling. The top leaves are cupping upwards.

What is happening? I faced the same issue before in my earlier grow, and that negatively affected the yield and quality of my buds .. I just don’t know what’s the problem. In both instances, the veg phase was beautiful and vibrant, but once I enter into flowering, these issues appear.

Some info:

I growing Autos in generic potting soil. I am using General Hydroponics nutes (following Autos feeding guidelines by the book)

Humidity is controlled between 50 to 60%

Average temperature is around 25 Celcius

I water and feed at about 6.5 to 7.0 PH. Two days ago I measured the runoff PH, and it was 5.6

I am entering my 7th week now, and will harvest in about 2-3 weeks from now.

Light is around 500-1000 PPFD (I am using a PAR meter)

Wind circulation is ok. I have a small fan at the bottom, and a large fan at the top pointed at the lights to cool the LED’s and provide little circulation.
 

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Shiranui

Member
I personally think that the plants need flushing because the runoff PH is 5.6 .. but I will wait until I get feedback from the expert growers here.
 

BobThe420Builder

Well-Known Member
Runoff means nothing,don't stress on that,but a flush couldn't hurt either

It looks hungry

I run gh flora trio and used a normal schedule with my autos. Your schedule seems really light

And usually in flower u add a PK booster like liquid koolbloom

I use this at or just below full strength in my Promix growsGH-Flora-simple-drain-to-waste.jpg
 

Shiranui

Member
I see .. I got my schedule off the web somewhere.

My next feeding is due tomorrow. I will use your schedule, and pray to god this saves them.
 

volcanoOFhistory

Well-Known Member
Do you notice any little flies around? I've seen my plants do that with fungus gnat infestations. Their larva will fuck your roots and plants up.
 
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