Signs of issues in week 9 of flower

I have two GMOxMAC girls in week 9 from the flip. A few weeks ago started noticing some bronze spots appearing and yellowing of top fan leaves. Thought calmg so I upped it's feeding of the calmg but no improvement as it seems more leaves are being effected.. Older/lower growth all looks good but flower growth and devel and water consumption has slowed dramatically. Roots look good.. This is a hydro grow and these two girls have their own rez. My other system is doing great and does not have this issue but it's a different strain. Temps are on the cool side. Daytime around 75, night around 60. Rh at 40%. Sitting about 16" below mars hydro 300w led. Sp3000. And ideas? I think I got at least 4 weeks to go on these.

Are you measuring EC and pH daily?

Yes. Ppm slowly creeps over a few days so I've been reducing the N each feeding trying to dial it in. But the ph falls quickly. Been trying to keep above 5.8 but sometimes it gets down to 5.5 before I catch it.

Seeing some burnt leaves are you sure you don't have Nute burn? If temperatures are good I would start flushing ASAP.

My honest advice is to dump your res and mix a fresh batch of a good solid base mix no additives lower in PPM by about a quarter than what it is now.

if at 500ppm switch down to around 350ppm. If at 1000ppm go down to 750ppm.

Set pH at 5.8 and run it for 24 hours then test what’s in the reservoir after that time.

if ppm decreases you’d expect pH drift up.

if ppm increases expect pH to drift down.

Let’s see what’s happening in 24 hours time.

Some of these leaves look a lot like russet mite damage. The way the edges are curling up and look blistered is very suspect. I'd scope your lower flowers and see if any of them look discolored, especially the bottom underside of the flower itself...russets work from bottom up most times.

waterproof808 said:

Some of these leaves look a lot like russet mite damage. The way the edges are curling up and look blistered is very suspect. I'd scope your lower flowers and see if any of them look discolored, especially the bottom underside of the flower itself...russets work from bottom up most times.

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It's hard to check way back there as things are a bit thick. But it looks like all the lower branches and flowers look great. The leaves look good and flowers look good. It's only these few tops and the leaves at the top of the canopy that seem to be effected.

phishmanforlife said:

It's hard to check way back there as things are a bit thick. But it looks like all the lower branches and flowers look great. The leaves look good and flowers look good. It's only these few tops and the leaves at the top of the canopy that seem to be effected.

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Might be too strong light in that case.

phishmanforlife said:

It's only these few tops and the leaves at the top of the canopy that seem to be effected.

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Alot of what you are describing screams russets. It would be worth it to get back there and scope that plant out with the curled up leaf edges and crinkled look to them, especially if its the furthest away making it likely not have received as adequate of IPM as the other plants in the room that are easier to access.

Do you have a fan blowing right on them at all? Light too close, too strong direct wind, or a combo of the two could make plants look like that and have the lower parts looking fine.

still looking dank tho!

M.O. said:

Do you have a fan blowing right on them at all? Light too close, too strong direct wind, or a combo of the two could make plants look like that and have the lower parts looking fine.

still looking dank tho!

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Yes. The plants got much larger than expected so there is a large fan really close which is why I can't raise my light any further. It's hitting the wall mounted fan above it. Have already learned alot of new lessons on this grow.

And thanks. Here is a bottom bud off the two plants next to these. I'll be chopping next week or 2. I'll get picks of tops when I can get close. They got almost 7.5ft tall and I didn't lollipop near enough. Lol.

waterproof808 said:

Alot of what you are describing screams russets. It would be worth it to get back there and scope that plant out with the curled up leaf edges and crinkled look to them, especially if its the furthest away making it likely not have received as adequate of IPM as the other plants in the room that are easier to access.

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Ok. I am chopping the two plants next to these next week which will give me full access so I will be taking a close look.