Need Help brown spots

im in my 3rd week of flowering in coco and i started getting necrotic brown spots on my leaves about 10days ago.

I use R/O water, my nutes are GH coco-tek, ph 6-6.2

After I noticed the spots i added 1tsp/gal of cali-magic to the rez, as it looked exactly like calcium a deficiency. However the problem continued to get worse. My plant looks really good other than the necrotic spots.

Tonight i changed the rez added 10ml/gal of coco-tek A & B, 1tsp/gal of cali-magic. ppm 1000, ph 6.0, then i flushed my plants with the new rez water.

Im very consistent with feeding as its on a drip timer and my water is R/O so i know exactly whats in it plus my ph rarely changes. Everything I've read about calcium deficiency recommends supplementing with a calmag product which i have and my base nutrients have extra calmag in them.

Hopefully my rez change and flush will help but honestly I have not idea what to do if this doesn't work.

I have a few fungus nats flying around in my tent but its not a swarm its likes 1 or 2 flying around. my camera sucks

try raising your ph to 6.8 for a few days

Jesus Christ was atheist said:

im in my 3rd week of flowering in coco and i started getting necrotic brown spots on my leaves about 10days ago.

I use R/O water, my nutes are GH coco-tek, ph 6-6.2

After I noticed the spots i added 1tsp/gal of cali-magic to the rez, as it looked exactly like calcium a deficiency. However the problem continued to get worse. My plant looks really good other than the necrotic spots.

Tonight i changed the rez added 10ml/gal of coco-tek A & B, 1tsp/gal of cali-magic. ppm 1000, ph 6.0, then i flushed my plants with the new rez water.

Im very consistent with feeding as its on a drip timer and my water is R/O so i know exactly whats in it plus my ph rarely changes. Everything I've read about calcium deficiency recommends supplementing with a calmag product which i have and my base nutrients have extra calmag in them.

Hopefully my rez change and flush will help but honestly I have not idea what to do if this doesn't work.

I have a few fungus nats flying around in my tent but its not a swarm its likes 1 or 2 flying around. View attachment 3725505 my camera sucks

Click to expand...

Nutes are being locked out.

its in coco? try swinging ph between 5.8-6.2 and then maybe 6.5 next water and alternate
i have the same issue
my mix is mostly promix with a little soil and mine are doing better with hydro/soiless PH ranges
cal and mg get locked out in soiless mixes at higher than 6.2ish

calimagic by GH and a PH of 5.8 made my mine better and coco should be soiless PH

Yeah i grow in coco. I don't get it I'm doing the exact same thing as my last grow that turned out really good.

Other than the necrotic spots my plant looks really good so leads me to believe its getting all the other nutrients just fine just not calcium.

Ill try adjusting my ph

Hey guys I think this might be a spider might infestation? I've never had it before but i do see very tiny dots under my leaves

Some plants need more cal mag then others, just up the dose of cal mag,


If you think you have mites take a white lined paper , place underneath said leaves and shake the leaves, if little black stuff falls on your paper and moves you have mites

lady bugs cant hurt

Ill try the paper thing when my lights turn on. but I'm almost positive i have mights i found what looks like an egg on one of my leaves last night. lol i never thought id be so relieved to find out i have mights. My nutrients are on point thats why i was soon confused when it looked like i had nute deficiencies. hopefully i can get rid of them. was thinking about using bleach/water solution and spraying all my leaves?