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Calcium deficiency?

Doubledealing72

Doubledealing72

Well-known member
Hey everyone! My plants have been doing quite well for the most part. Let me explain the problem and environment:

This morning, I noticed a few tannish spots on a couple leaves. They are just over 4 weeks old, growing in Coco using GH flora trio series following nebulas feeding schedule with a few tweaks. I water once a day until I see runoff, and I do not flush at all. These spots are appearing on the older leaves that have light. Not too many le
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aves are affected so I'm hoping I caught it early. My pH is usually 5.7 to 5.8.

My thoughts are a calcium deficiency after going through some gwe articles, but I was hoping to get others opinions on here. Many deficiencies seem to have multiple potential problems (could be calcium deficiency, could be magnesium, could be manganese. There is more than one potential problem for brown spots is what I'm getting at.)

Since calcium is best absorbed around 6.2, I will be trying water with a slightly higher pH for a while. Should I just keep switching every watering? 5.8 one day, 6.2 the next? I know you are supposed to have a range of pH, and I haven't really been doing that.

Any advice is appreciate
 

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Hey Mcubed476, If it's only a few leaves and you have lots of good growth I see it as a heads up to keep an eye out for an increase in leaf discoloration. It sounds like you are well tuned in to your grow and are doing everything right. One option is to do nothing different for a few days and monitor for increased issues. Another option is try ph'd water with light Cal-Mg only for a couple of days just to make sure you don't have a nute lockout developing. I'm a rookie in coco and had some ups and downs in veg so just throwing this out there. Good luck and keep us posted.
 
Don't look like anything to worry about to me, just keep a close eye on her, nothing a little cal-mag and good PHwater want fix if it does turn into a problem, but I don't think it will. Good Luck 476
 
Mcubed, I always let my pH fluctuate between 5.6 and 6.4. When I first looked at your leaves, I wondered if something was nibbling in or on them?????
 
I've been wondering that too. I put some sticky tape up for the last week but nothing is on it. I've constantly been checking leaves on the underside as well and I'm not seeing anything moving around. I look at the Coco and don't see moving anything. So far there has been no sign of bugs of any kind, but I do have a few leaves that have holes in them, or slightly shredding. With no signs of bugs, is this something that could be caused by pH problems?

Sometimes when I water I get some on the leaves by mistake. I always try to dry it up with a paper towel, but is it possible that water droplets burn through the leaves?
 
I don't know; perhaps that could be it if the light hits the water; it doesn't look like Nebula's pics of calcium def.--not yet.

And some of the critters are so small that you absolutely won't see them without the aid of a loupe or something. I think maybe this is what I was thinking of, but it doesn't look like this, either: http://www.growweedeasy.com/cannabis-leaf-miners

You got a good loupe? I mean one that you can really see with?

Now if it's just on a few leaves, and only outer leaves where water might have spilled, maybe it's that. Where else is it?
 
I do not own a loupe, it may be time to invest in one though. It is mainly on the outer leaves, maybe on 5 or 6 leaves total. The other plant that is the same age is getting the same nutrient water as this one, and doesn't seem to show any of those signs.
 
As always, Thanks for the advice alltatup! I ordered a Jewelers loupe off Amazon. It will be here in a couple days! Then I will be able to really take a look!
 
No worries alltatup! I bought one that is 30x and 60x. It wasn't the one in your link, but some magnification is better than none lol
 
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