Magnesium defiency, Calsium defiency, Phosphorus defiency or what is this?

[MedGrower]

I have had this similar problem appearing in my previous grow in around weeks 3 to 4 when I have had my pH low around 5.7 or so in DWC. For some reason this seems to happen to me in low pH even though people here always say that it would be ideal to have pH at 5.8. I think my plants got over this issue after I added more nutrients and calmag and raised the pH of the reservoir to 6.2.

I first started noticing light green patches forming on the older leaves, then followed the brown spots and then they became all crusty and curled upwards as they dried. This then started appearing on higher leaves some but not too badly until it stopped. All top leaves and new grow was just ok. Some new growth on lower brances was little pale on their colour while others on top were just super good looking and healthy. So it is not any crisis here but I still wonder what exactly was this problem anyway? I am not totally sure. From all the material I have checked this one seems it could be magnesium defiency as well as calsium defiency as well as phosphorus defiency?

Can anyone say what this was? I would be really glad to solve it and take measures to prevent this one from happening again.

Here is a picture of one lower leave:

 

[Waira]

Hi Med--pardon the delay mate, somehow missed this one,... Hmmm, those light patches are a bit odd,... I'm not hydro-savvy, and am still learning the often peculiar symptoms that occur with pH changes,... not that yours have been off by much! This doesn't match up well with any particular defc.,... some more pics, closer, and whole plant might help,....this leaf- one of the lower ones? It kinda looks like thrip damage-- have you checked for vermin? -like, under leaves for eggs, larvae,...though thrips are bold enough to be right on the upper surfaces, feeding and dashing off,... Just a possibility bro', from what you said, I'm still leaning toward some temporary shift in pH causing this,... I'll ask more experienced eyes to have a look too!

 

[MedGrower]

Thanks for the reply and help! I cannot post any pictures at the moment but this one was picture of one of lower, older leaves. The "patient zero" and there was total of 4 leaves having exactly same symtoms. I checked the leaves before for anything buggy -like and didn't notice anythings usual. I did even check with microscope.

Might it just be that I gave her too hard training? I did first supercrop the mainstem, then top my plants and then supercropped sides, between all stages I gave about 3 days to recover. Infection? I keep my garden clean always but cannot help any contaminants coming from outdoors. These are DP's Ultimates so they are really vigorous plants and did overcome whatever this is. It still bothers me since I had this happen year ago with DP's CBD Skunkhaze.

Interesting that from the two plants now, the other one keeps the pH up at 6.2 and other one lowers in in a single day down to 5.5 pH. Same state, same strain and same blend of nutrients. Canna Aqua Flores that has well established pH buffering.

 

[Grey Bear]

Hey MG,
I would like to help, but I am clueless without a good picture of the whole plant.
And I tend to rely on the whole plant to gauge what is going on.

Ugly leaves really bother some people, but unless the plant as a whole is showing the problem, my personal response is generally to leave it alone.
I am subbed now, so when you are able to post pics I will let you know if I got any thing.

Good Luck
Those DP AU's seem to be very nice yeilders!

 

[MedGrower]

Thank you for you input. Now I got back and got some pictures of my little well recovering patient.



Note that this damage seen on the plants have been there for about a week now and the progression has stopped.