Help -- mottled leaves and a few turning dark on edges

Need some help – I am a reasonably new grower trying to get my arms around an indoor dirt grow as I think about medicinal supply for two family members – one cancer and one PTSD.

The grow, pictured below has a few issues and wanted to raise them before flipping to 12/12. The plants are all a mix of GDP (so claimed and taken from clone) and Vanilla Kush. About 10 weeks in. One third of the grow (the area closer to the camera going as far as the tennis ball on the left side) is growing under T5 lighting (mostly GDP) and I am seeing some leaf drying problems.

The area behind the tennis ball is growing under a variety of LED lights (mostly Kush) and I am attempting a SCROG grow and that seems to be doing pretty well. But seeing some mottled coloring on the leaves.

Soil is Fox Farm Ocean, and using fox farm nutes. Big bloom and just started to add tiger bloom four days ago.

Keeping humidity at 70 percent or less. Can control.

Heat is a problem and not much I can do to control – gets hot in the summer.

I am often in the 80”s sometimes even high eighties.

As you can see a few plants have some curling and browning leaf edge. Also a number of leaves are a bit mottled (sort of yellowish specs). Don’t think it is WPM but plan to treat with SM-90 shortly.


Thoughts on the leaf causes?

I can't see your pics well at all. In my experience using the ff feeding schedule, especially if at full strength, you need to be flushing a bit to keep your salt levels down, especially if hot.

I think you are way to humid and too hot..causing heat stress...you can only pull those temps off if you are running Co2. Tiger Bloom is pretty hot too

I can see all your little spots and shitZ. I dont know whats going on with fox farm but all I hear is problems. Maybe you fox farm guys should use one part happy frog and one part ffof. What dou you fox farm experts think?

I been using FF soil and nutes for 2 yrs with no probs..I'm starting to think that ppl that have problems with the feeding schedule arnt using it right. The feeding schedule is so easy to follow

I hear you on the nutes too hot and flushed today. Don't get the too high humidity comment though. What I read (Cervantes groweres bible for example) say 70% humidity in vegatative state and I am just below that. In any event two better leaf pictures -- a few are burned like the one on the left -- a lot are mottled like the one on hte right.

I had mold at one time...it sucked. I keep my rh lowest I can. Makes for stickier buds too

mike66 said:

I hear you on the nutes too hot and flushed today. Don't get the too high humidity comment though. What I read (Cervantes groweres bible for example) say 70% humidity in vegatative state and I am just below that. In any event two better leaf pictures -- a few are burned like the one on the left -- a lot are mottled like the one on hte right.View attachment 3199391

Click to expand...

the leaf on the right looks like spidermite damage.