What’s the common cause of this

Any one know what the common causes of this type of spotting is ?

Plant abuse.

Honestly I can't say what exactly you have going on but I'd guess something is up with pH or feeding. You've got severe damage on a few leaves, but most of your leaves also have interveinal chlorosis. I also see tip burn.

What fertilizers and supplements are you using, how much, how often, and what are you pHing your water to? Do you take runoff readings?

i think your PH is out and it is locking out some nutrients maybe or it's underfed or something it's hard to tell without knowing a lot about it

The spots are indicative of ph swinging. They also look very turgid from over watering. Let them dry out quite a bit and adjust your ph next watering. Good luck.

That's 100% ph issue. My bluelab pen was reading my shit off by a lot it would normally be 6.2 but was either reading under or over by .8 I already replaced it with a Guardian. Always recalibrate every week at the start of a new feeding week. Just to be safe. If you want to be extra accurate you do it everytime you water and feed.

So I normally grow in coco have done for years but I thought I would try soil and grow organically but before I makes the switch to soil in my big tent I set up a little test tent to so how it does from what I have read is that you don’t need to worry about ph in soil and the mix am using says “ The potting mix is also pre-buffered for pH with a liming agent so no need for any expensive pH meters either! The liming agent that is used in the potting mix automatically corrects any pH variations in the substrate back to the ideal level.” Do use guys recommend to ph anyway ? I have heard it can do more bad then good to ph when in soil

I would pH some fresh water, take that reading, water the plant to runoff, collecting the runoff, and pH that. Should give you an idea of the pH of the soil. Buffers don't last forever.

I personally always pH'd my water when running soil in pots. In the ground, I don't bother, but in pots, with frequent fertigation, as far as I'm concerned that's basically just soilless hydro.

Dannyh1231 said:

So I normally grow in coco have done for years but I thought I would try soil and grow organically but before I makes the switch to soil in my big tent I set up a little test tent to so how it does from what I have read is that you don’t need to worry about ph in soil and the mix am using says “ The potting mix is also pre-buffered for pH with a liming agent so no need for any expensive pH meters either! The liming agent that is used in the potting mix automatically corrects any pH variations in the substrate back to the ideal level.” Do use guys recommend to ph anyway ? I have heard it can do more bad then good the ph in soil

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The humates and microbes in soil will buffer it, IF you have enough....plus of course the dolomite. But it really depends on your water-you probably won't need to adjust it, but I would never give the blanket advice that "soil growers never should ph their water" because some people have some crazy water that should be either ph'd or, preferably, filtered.

So ye the ph is way off come to 3.9 after adding all the nutrients and my tap water is 6.8 so got some organic ph up what would you ph the water to get it to sort it self out? shoud I just start PH in to the normal 6.3 or would you go up to like 7 to raise the ph at roots quicker Then drop it back down after a few feedings

Whoever told you to not PH water got very lucky and doesn't know what they are talking about and wouldn't keep having success never PH'ing.

Dannyh1231 said:

So ye the ph is way off come to 3.9 after adding all the nutrients and my tap water is 6.8 so got some organic ph up what would you ph the water to get it to sort it self out? shoud I just start PH in to the normal 6.3 or would you go up to like 7 to raise the ph at roots quicker Then drop it back down after a few feedings

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At a 3.9? Do something about that lol. I'd be pHing with it being that drastically off. 6.5 is the target.

Especially later in flower.

Depending on the nutes you have given you may have killed off the microbes by now as well. So pHing your water become the delivery system for nutrients.

I suggest doing it regularly from here out.

Wizzlebiz said:

At a 3.9? Do something about that lol. I'd be pHing with it being that drastically off. 6.5 is the target.

Especially later in flower.

Depending on the nutes you have given you may have killed off the microbes by now as well. So pHing your water become the delivery system for nutrients.

I suggest doing it regularly from here out.

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Luckily the grow nutrients I have bean using comes to 5.9 still low but not to bad it’s the bloom food that come to 3.9 and it’s only had one feed of bloom nutrients so far . just gave it a feed at 6.5 and and run off it come out at 4.6 so hopefully a few more feeds and it will sort it self out