Red spots on leaves

[Greentree69]

I check my plants everyday I usually have to water them and today when I watered them there were these reddish spots in some of the bigger leaves any ideas on how to fix this I'm like 4 weeks into flower I have 2 plants in this tent and only one is affected same watering schedule same nutes!??

 

[Old Salt]

Can you post a picture under white light? It's difficult to make out under 'blurple' light, and the coloration can be important.

 

[Calvados]

Looks like a drip.

 

[Greentree69]

Can you post a picture under white light? It's difficult to make out under 'blurple' light, and the coloration can be important.

It seems to b getting a bit worse and it's only affecting the larger leaves

 

[Old Salt]

It looks like a phosphorus deficiency. The purple petiols or stems from the leaf to the branch are a further indication of this.

If you grow in soil give Emilya, Duggan, or Mr. Krip a shout. Just put a '@' in gront of their name, and they should get back to you within a few hours.

If you are growing soil less, I can usually help. For other forms of hydroponics, try TurboBucket.

It would be very helpful to include the specifics of what you are growing in, the nutrients you use, and their concentrations, as well as your watering schedule.

 

[Greentree69]

This is my first grow so I wasn't very familiar with using nutes or anything but I'm growing in ffof and havent given any nutes until I gave them a half dose of the ff trio tiger bloom and big bloom this past Sunday and I usually water dayly as I've had them in 3 gallon pots from seed it the mesh pots are usually dry after 24 hours I haven't pH tested the water I've been using gallons of spring water from Walmart since seed @Mr. Krip @Duggan @Emilya

 

[Mr. Krip]

Can you post pics of the entire plant so we can see exactly how much and which areas are affected? Also, are you feeding any Grow Big? If not, it's a possible N deficiency since the Grow Big supplies the Nitrogen.

 

[Greentree69]

See I thought I might have overdone it with the half dose I gave them since I hadn't giving them any nutes to this point but I didn't give grow big do u think it would help without giving them nite burn. I am noticing the leaves are yellowing a bit but the second plant still doesn't seem to b affected which is good

 

[Mr. Krip]

The issue definitely is NOT nute burn. It does look like some deficiencies, though, and it's possible the plants have depleted the nutrients in the soil by now. So, I'd mix a batch of full-strength nutes and, if you have it, add 5ml per gallon of Cal-Mag. It's tough to tell from the pic but you may have an iron deficiency (yellowing between leaf veins on newer growth) and the Cal-Mag also has iron.

This is the Fox Farm feeding schedule for soil:

https://foxfarm.com/download/13115/

 

[Greentree69]

Thank u very much and I think I can come up with some Cal mag I will give a full dose of nutes that wouldn't hurt them? Since I haven't given them any yet it says start at seedling and also what week should I follow instructions for?

 

[Mr. Krip]

Typically, you start the plant on half strength nutes when the seedling has 3 set of new leaves (don't count the coteleydons) and then work up to full strength. This is because a young plant will get nute burn if the PPM's are too high. However, your plant, from the looks of it, is about 4-5 weeks into flower. So, I'd use the feeding schedule for a plant of that maturity. I'd start at something like the week 8 column in the spreadsheet which includes the Grow Big. Note how you should feed the Grow Big every other feeding in flower and the dosages are the same (3-2-2) once the plant is mature. If you're worried about burning, you can lower the PPM's a little to see how she reacts, but it should be fine.

 

[Greentree69]

Thank u very much I just gave them a dose at week 8s recommendations. When will I know when to stop giving the nutes another question I've was worrying about with using them

 

[Greentree69]

Still progressing, now I know I won't b able to undo the damage already done but will she make it to harvest? she isn't using as much water as usual also and there are 1 or 2 leaves on the bottom of the plant that are brittle I can hear the fan passing over them but I figure they could b dying considering they r getting no light at all

 

[MrSauga]

I'm not so sure it's iron or N def. Iron def starts yellowing from the back of the leaf to the tip and usually affects the upper growth only. N def is mobile, so the bottom leaves would be yellowing and dying out before the tops ever showed it.
To me it's either Zinc or maganese but zinc doesn't show the spotting. I would lean towards maganese being the issue which really is not that common either. If you are adding too much Ca then the availability of Mn is decreased. Check to make sure your pH is in range as this is most likely the issue since you mentioned you have not checked your pH yet.