I have 5 Great White Sharks almost 6 weeks into flower. Bud production has been good so far, and for the most part, they've been very healthy. However a week or 2 ago I started noticing some leaves on a particular plant turning yellow, which is progressing to brown, starting at the leaf tips, moving down towards the stem. So far I've only noticed it on fan leaves and larger sugar leaves. Pics are of the worst plant, 2 others are just starting to yellow, and the others are still very healthy looking. The stems on the afflicted leaves are still strong.
Some smaller leaves are also fading and falling off but I think thats just because they're in late flowering and getting used up.
It may also be relevant that I had a sativa bagseed i was growing under the same conditions that i am getting rid of this week (starting to hermie). It's leaves were yellowing a lot (way more than the GWS) and leaves were starting to curl under. They didn't brown like the GWS are though, even on the most yellow leaves. This started maybe a week or 2 before the other plants had issues. (You can kind of see a couple of it's leaves in the background of the last 2 pics... Not a happy plant.)
Vegged for between 5 and 7 weeks (should've recorded the date or at least remembered it, i know) under cfls, added a 400w HPS a week before flowering.
My soil is about a 2:1 or 3:1 mix of Circle H triple mix and perlite
I water whenever the moisture meter starts to enter the "dry" range, every few days.
Strangely enough I use Advanced Nutrients Sensi Grow Part B (1-2-6) for bloom. Just part B. Its hydro nutes, bought by accident but the n-p-k seems suitable for flowering and it balances out my basic tapwater very well (pH is least 8+, nutes bring it down to around 6.5) I was putting nutes in every watering until i noticed the problem. Since then I have given just tapwater once (which i forgot to PH down unfortunately) and normal nute-water once, sinse it seemed regular tap water did not help at all by the next watering.
I also thought they may be rootbound, so i cut the bottom off of the pot, loosened up the roots at the bottom, and set it into an other pot with the bottom filled with soil to allow some extra room for new root growth, but that was almost a week ago now too and its still getting worse by the day.
I trimmed all the brown off the leaves yesterday, so any brown you see is new as of this morning (Not the yellow. I haven't been trimming the just yellow bits.)
I'm at a loss as to what to try next. I really don't want my yield to suffer any more than I'm sure it already has.
Thanks in advance for the help!
Some smaller leaves are also fading and falling off but I think thats just because they're in late flowering and getting used up.
It may also be relevant that I had a sativa bagseed i was growing under the same conditions that i am getting rid of this week (starting to hermie). It's leaves were yellowing a lot (way more than the GWS) and leaves were starting to curl under. They didn't brown like the GWS are though, even on the most yellow leaves. This started maybe a week or 2 before the other plants had issues. (You can kind of see a couple of it's leaves in the background of the last 2 pics... Not a happy plant.)
Vegged for between 5 and 7 weeks (should've recorded the date or at least remembered it, i know) under cfls, added a 400w HPS a week before flowering.
My soil is about a 2:1 or 3:1 mix of Circle H triple mix and perlite
I water whenever the moisture meter starts to enter the "dry" range, every few days.
Strangely enough I use Advanced Nutrients Sensi Grow Part B (1-2-6) for bloom. Just part B. Its hydro nutes, bought by accident but the n-p-k seems suitable for flowering and it balances out my basic tapwater very well (pH is least 8+, nutes bring it down to around 6.5) I was putting nutes in every watering until i noticed the problem. Since then I have given just tapwater once (which i forgot to PH down unfortunately) and normal nute-water once, sinse it seemed regular tap water did not help at all by the next watering.
I also thought they may be rootbound, so i cut the bottom off of the pot, loosened up the roots at the bottom, and set it into an other pot with the bottom filled with soil to allow some extra room for new root growth, but that was almost a week ago now too and its still getting worse by the day.
I trimmed all the brown off the leaves yesterday, so any brown you see is new as of this morning (Not the yellow. I haven't been trimming the just yellow bits.)
I'm at a loss as to what to try next. I really don't want my yield to suffer any more than I'm sure it already has.
Thanks in advance for the help!