HELP! Brown spots on leaves

[Bennie]

Hi first time here so I'm not sure I am posting in the right section. Sorry if I'm not but my plants are having an issue with brown spots on the leaves. Can anyone identify this???

 

[Tersky]

Looks like calcium deficiency. What medium are you growing in? If you are growing in coco then you will need a cal-mag suppliment. If you use RO water you need it as well. What nutes are you using?

 

[Bennie]

Growing in dwc system. Nutes are canna flores

 

[Tersky]

What is your ph? Do you let it range between 5.5 and 6.5? If the ph doesnt get to 6.0 then it can have trouble absorbing calcium. What is the ppm of the base water you are using? If it's below 150 then you may want to ad a cal-mag suppliment. If you dont have a tds meter i suggest getting one, as a fellow hydro grower. Testing my ppm's help me know if im over-feeding or under-feeding and i have found it to be extremely helpful.

 

[kingfish]

I would look for bugs. Get a jewelers loop and look under the leaves.

 

[Bennie]

PH is between 5.5 and 6.5. I don't have a TDs meter I need to get one but this grow is not far from finishing so it will have to wait. I am going to start flushing in 2 weeks. As for bugs I ha ent seen anything and have been looking closely. Reason I don't think it is bugs is because the plant next to it is fine shows no signs of damage

 

[Tersky]

Oh if you are close to harvest i wouldnt worry about it. It's probably a minor calcium deficiency but leaves can show deficiencies right before harvest i find sometimes. I have spots like that on mine right now and i'll be harvesting soon as well. I use RO water and have to supplement cal-mag, tho i have been dialing it down a little since im getting closer to harvest.