tiny brown spots on top of fan leaves

[Samatha Sativa]

I'm thinking it looks like manganese deficiency the more I look at the deficiency charts. Calcium deficiency seems to mainly cause stunting but idk about spots like that.

Well the good news is it does not seem to have gotten any worse lately.
Thanks Rook!

 

[DiscoBiscuit]

2 tsp CalMag per gallon is a little rich, IMO. I think the label recommends 1 tsp/gl. I only use 1/2 tsp once, maybe twice in flowering but only if the runoff pH is higher than 6.5.

 

[Samatha Sativa]

Thanks for the help +REP to everyone!

 

[s13sr20det]

do you check the ph of the water each time?
looks like ph spotting caused by fluctuations in ph

check out the ph section @ www.ganjaguerrilla.net

i am by no means an expert, but i had this problem before. that site saved my ass many times.

good luck and keep it green

 

[lysol]

do you check the ph of the water each time?
looks like ph spotting caused by fluctuations in ph

check out the ph section @ www.ganjaguerrilla.net

i am by no means an expert, but i had this problem before. that site saved my ass many times.

good luck and keep it green

This is the best read for a newb. The more I keep at hydro the more I realize there are multiple symtoms, over ferting causes symtoms of under ferting, PH causes symptoms of over ferting, etc... you have to really pay attention, just because you adjust the PH tuesday and the plant looks worse wed and thurs doesnt mean the recent PH changed caused it, the effects are so delayed you almost have to read all the guides out there and really think back 2 weeks and look at what you were doing with the plant. ( over fertilization can manifest itself in like 10+ ways )

This is a must read, excellent photos... if anyone has more send me a visitor message or somethin! We really need this info stickied or something, I didnt even realize there was more then 1 effect from each causation until I visited a competitors forums, we have 1 sick plant guide but we should link to some more and explain a lil more info, IMO esp. on how over ferting manifests itself as a deficiency, when you have guys on here spouting to start seedlings at 300ppm you do it and see a N def, a newby will be inclined to hit it with 350 / 400 ppm, worsening the problem and causing a ton of these threads ( I feel I have opened more than my own fair share and I feel like it could have been avoided if there was a lil more consistent info )

 

[s13sr20det]

^^thanks. ganjaguerrilla would help me out all the time on grasscity. i gladly gave some of my photos from my first grows to him to help the community.

 

[B.C.]

do you check the ph of the water each time?
looks like ph spotting caused by fluctuations in ph

There are enough humates in the soil ( via worm castings and forest humus ) to buffer any PH swings. That's one of the great things about organics. You can grow about any plant regardless of the soils PH, if you have enough humates the plant will still feed. Anyhoo, it's usually makes for PH problem free growing. BC

 

[DiscoBiscuit]

... we have 1 sick plant guide but we should link to some more and explain a lil more info, IMO esp. on how over ferting manifests itself as a deficiency, when you have guys on here spouting to start seedlings at 300ppm you do it and see a N def, a newby will be inclined to hit it with 350 / 400 ppm, worsening the problem and causing a ton of these threads ( I feel I have opened more than my own fair share and I feel like it could have been avoided if there was a lil more consistent info )

If you want to avoid inconsistencies, look for the consensus view. I know that's harder than it sounds with some topics. Some are flogged like a dead horse and others are rarely discussed.

I have a huge word file that I cut and paste info into categories. It's not published so I don't have to worry about copyright stuff. It keeps me from having to search through mounds of info when I need a quick fix. If all the info on IC was categorized and edited, you'd probably have a volume the size of Britannica encyclopedia.

 

[ToughGirl]

I believe it's a fungus or bacteria. Too many people have these spots and everyone tries cal mag or epsom salts, (believing it's a magnesium deficiency) and it doesn't help. Possibly the strain itself just isn't resilient to fungus? Check the under side of the leaf, if it's fine and all the damage is on top, it's a fungus. Also check for yellowing around the brown spots, if it's there it's probably not a deficiency. Also note the time of year, warm months are the worst for fungus and bacterias.

 

[DiscoBiscuit]

Samatha, I know you said the water sits for 2 or 3 days before use. I still think it looks more chlorine related than calcium. That's assuming it's chlorine. Larger municipalities use chloramine, a chlorine and ammonia compound. The compound chemical doesn't evaporate like plain chlorine. Some folks say it has to be filtered out and others say filtering doesn't work either.

You can do an easy test to tell what type of treatment chemical is in your water. Fill a white plastic container with tap and look at the color. Plain chlorine will have a blue hue and chloramine will be yellow. If it looks yellow, you might consider another water source.