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rust spots on marijuana leaves

Rust spots on fan leaves during flowering?

Antigen
Well-Known Member

Hello, I have been growing indoors for quite a while now and I have not seen this problem in any of my plants before. I have attached pictures of what is happening.

The problem is only occurring on the older fan leaves near the top of the plant (for now). Newer growth and growth lower down doesn’t seem to be affected (yet).

The plants are grown in Ocean Forest potting soil and I use Earth Juice fertilizers (Grow, Bloom, and Micronute). I always check the water pH before watering to make sure it is around 6.5. I do add all my fertilizers and things to the water first and then adjust pH at the end before I water.

I do not have a soil pH tester or the money to buy a good one (since I’ve heard the cheaper ones do not work well enough to rely on). I’m hoping if this is a soil pH problem someone could tell me based on the pictures if it is too high or too low so I can try to correct it.

I have 2 plants that have been treated exactly the same since they were cut from clones, given the same dirt, water, and ferts, but only one of them is showing this problem. The other plant looks perfectly healthy.

The problem seems to start as tiny rust-colored spots near the veins of healthy fan leaves (see picture 1 below) and it progresses to much larger rust spots along with yellowing and curling/twisting up (pics 2-4).

If anyone has any ideas as to what might be causing these spots, please let me know, or if you need more information than I have provided in order to figure out what is wrong.

Hello, I have been growing indoors for quite a while now and I have not seen this problem in any of my plants before. I have attached pictures of what is…

Rust spots on leaves

GD1576
BigCube

It could be rust. But I assume it would have spread to the others by now if it was. If it was nutrient build up, you think flushing would have stopped it. Not made it worse.

I’d be leaning more toward a deficiency maybe, like low in calcium. Are you supplementing calmag?

Another option could be your water source. Maybe too much chlorine I the water, but not likely since the other plants are fine..

If you can help us out, let us know your particulars. Feeding schedule, nutrients used, supplementation used, rh, avg temps. Ect..

GD1576
NairnM16
NairnM16

It could be rust. But I assume it would have spread to the others by now if it was. If it was nutrient build up, you think flushing would have stopped it. Not made it worse.

I’d be leaning more toward a deficiency maybe, like low in calcium. Are you supplementing calmag?

Another option could be your water source. Maybe too much chlorine I the water, but not likely since the other plants are fine..

If you can help us out, let us know your particulars. Feeding schedule, nutrients used, supplementation used, rh, avg temps. Ect..

Hey guys 2nd grow and I obviously have a problem. These rust spots on my leaves, what are they? Initially I thought lock out, so I flushed for 3 days but…