3 wks into flower, yellowing leaves

[hbbum]

Today is 3 weeks in to flowering, the sugar leaves are yellowing a bit up top. I just finished my first week of flower only nutes in FFOF (Big Bloom and Tiger Bloom) and next feeding I will be doing another round of BB, TB and Grow Big.



Appears to be N, not sure if just continuing the Fox Farms trio will be enough and I shouldn't worry about this, or if I should look into adding something else.

FWIW I just gave 6.5PH water with unsulffered blackstrap molasses, my pots are a little smaller than I should have gone at 3gallons so I am watering almost every 24 hours (based on weight) and feeding every other watering.

 

[Timewalk]

Wow i haven't seen a lot of plants so early in flower
leaves yellow so early i could see if you were 2 weeks away from harvest
ocean forest has a lot of food in it can go month
or 2 with out feeding.
is your soil really moist any fungal gnats flying around ?
I had a issue like this plant was feed every other
watering but some how fungal gnats infested the soil
and larva started eating root hairs which starved the plant

 

[churchhaze]

It is not an N def. If it was from nitrogen, the leaves would be turning yellow from the bottom up, big fully expanded leaves first. Because it's yellowing from the top down, it rules out all the mobile nutrients, N,P,K,and Mg.

It's not calcium, so it looks like iron deficiency to me.

On a side note, a large percentage of people with nutrient problems seem to be coming in with fox farms. Hmmm.

 

[AimAim]

Keep nudging up your Nitrogen. Just my opinion. Give them 1/2 strength for a couple waterings, then full strength for a couple wqterings.

 

[hbbum]

Thanks, I suspect it could be fungal gnats (dammit). I have not seen them in my actual grow room, but I did notice a bug in the adjoining room that when put under my scope looks a lot like a fungal gnat.

I will hang a strip in my room and see if I come out with a bunch.

Thanks for the quick replies

 

[AimAim]

Wow i haven't seen a lot of plants so early in flower
leaves yellow so early i could see if you were 2 weeks away from harvest
ocean forest has a lot of food in it can go month

Leaves start to yellow out as soon as a person switches to 12/12.

Get used to it, it's not a problem, it's how plants shut down and die.

 

[churchhaze]

He just said from his experience he hasn't seen a lot of plants yellow out that early, and he's right... Seeing is believing. The only time I've had leaves yellowing that early is when I fucked up the nutrients. If you personally have yellowing leaves immediately when you switch to 12/12, you're doing something wrong, or you just don't like your leaves.

Leaves start to yellow out as soon as a person switches to 12/12.

Get used to it, it's not a problem, it's how plants shut down and die.

 

[hbbum]

Fungal gnat?

 

[Alexander Supertramp]

Leaves start to yellow out as soon as a person switches to 12/12.

Get used to it, it's not a problem, it's how plants shut down and die.

Simply not true in the real world. Only true in forum land where people blame the plant instead of their lack of growing skills....
Plant yellow and die after they have finished fruiting/flowering, not during.

 

[Alexander Supertramp]

A pic of the entire plant would help. It almost looks like light bleaching too me...

 

[Timewalk]

Yes sir looks like a fungal gnat here are a few suggestions

1, water when your plant looks thirsty leaves
drooping and light container weight.
2,spray top layer of soil with pyrethrum
walmart sells a good one by
safer brand called insect killer
3, cover top of soil with a thick layer of sand
,hydroton or perlite as fungal gnats
need moist soil to start there distructive course
4,optional get a insect killing soap
and flush soil with it should dry the larva
out

 

[hbbum]

Hard to see the color from this pic, and the others in mu journal are under HPS so everything looks yellow.


I do keep my light pretty close to the top (3-4" from the glass)

Getting some strips to see if the gnats are confined to this Jasmine plant or if they are in my grow room.

 

[churchhaze]

Everything looks great when you show the entire plant. It really does look like it's just the new development that's yellowing, and I can hardly see it from the big picture. It can't be a mobile element deficiency causing the new leaves to be yellow. It can't be N deficiency.

You'd think if the problem was from pests eating the roots, all the elements would be deficient as a result instead of just iron, but your plants otherwise look excellent.

 

[Alexander Supertramp]

Put some pieces/slices of potato on top of the medium. Let it remain for 3-4 days then check the underside of the slices for gnat larvae. The larvae like to feed on the potato. Good way to check for them and also helps control the population. Just replace the slices every 3 or 4 days as needed...otherwise like church said your plants look excellent.

 

[hbbum]

Thanks, grabbing some fly tape to hang and will put a couple slices in there. There is a chance that the gnats stayed confined in the jasmine plant that is not in the actual grow room (and has since has its bug infested roots evicted to the back yard). If I find some in the grow room I will start treating for them. I may allow a little extra time between watering to see if that forces them up into the potato slices as well.

 

[hbbum]

Getting a little worse, I have just continued my normal feeding schedule. The good news is no bugs, I hung a strip for a few days and not a single gnat appeared.

Really looks like N, it is just on some of the sugar leaves on the top of the canopy, nothing down low(those are all good and green) but it seems WAY early in flowering to be running low on N. (25 days from 12-12)



They smell amazing, like lemon and are so sticky I need to wash my hands up to my elbows after I re-arranged the canopy to pull some additional bud sites up to the screen.

 

[hbbum]

Any ideas here?

 

[rwbrock]

Wow so I just had this happen to me using ffof for my soil. It was around week four of flower. It started at the bottom with all my large fan leaves. Totally thought it was n. but I had been feeding after week 3 of veg doing a feed water water. So I bumped it up to water feed water and hit it with some extra n. (half strength)it did not help. I decided to check ppm on runoff of soil and it was off the chart. So I started to think I may have had salt buildup and lockout starting. I did a flush and brought the runoff pm down and started over. Plant seemed to respond well and yellowing has subsided. I went with same logic you did and thought maybe it was me changing up to smaller 2 gallon smart pots and maybe they were too small? Maybe it is the batch of soil out there I have seen a few posts like this of late? I had a lot of people tell me this was natural and I was like hmmmm. I usually stay pretty green up until end of flowering and knew something was not right. Hope that helps.

 

[automated]

Did you stop with the grow nutes in the first two weeks of flowering ?

In those first couple weeks the plants eat like mad and grow and stretch tremendously.
Could be a general overall shortage.

 

[hbbum]

I ran flowering nutes for the first 2 weeks of flowering until she stopped stretching. I have not done a flush at all, in fact now that I have the screen in I am not quite sure if I can get it out of the grow box. Next watering I will check the PPM of the run off to see if that is high. What would a good number be? I have been checking the PH, but not the PPM.