Week 5 of flowering, brown spots and dying leaves. Need ur help please

[420producer]

This.

I will also say if you feed every time mix weaker and water until 20-30% runoff to prevent salt buildup.

as well check what your ppms coming out of your run-off.is? so you can copare to what you put in. as well.. see what waterPH is of run-off. ph is at 7? maybe 7.5? . this will help to see if posible you are locked out.

 

[jbcCT]

Hi,
It's my first grow in soil, I'm in week 5 now of flowering.
Mainly white haired buds now and very small areas have brown/yellow color so there is more way to go.

My problem is that my plant have some leaves with small brown dots and most of the leaves are burnt tips that go upwards (from last week).
I had before some leaves with brown small dots(even in veg period), mainly on big bottom fan leaves that eventually turn to yellow and die(I thought that not too much light so this is the case), but it's spread out quickly in the last week and I see more symptoms like:
- Purple stems of fan leaves on top get more and more.
- Small brown dots increased on leaves and also came up.
- Top leaves turn to dark green and are not so soft, also curl sideways down.
I added some pics that you can check and help me.
I thinks also that buds are not so big, but I'll let you decide.

I'm using 4 x LED bulbs 26W each (2,450lm), 12/12 light schedule with complete darkness.
I'm using BioBizz nutrients, my last 4 watering as follow (ml per liter):

WEEK 4 - 31/10/2016 -
BIO GROW - 2ml, ALG-A-MIC - 3ml, BIO BLOOM - 3ml, TOP MAX - 1ml.
WEEK 4 - 04/11/2016 -
Same.
WEEK 5 - 08/11/2016 - (Made some increasing)
BIO GROW - 2ml, ALG-A-MIC - 3ml, BIO BLOOM - 4ml, TOP MAX - 1ml.
WEEK 5 - 08/11/2016 - (Made more increasing)
BIO GROW - 2ml, ALG-A-MIC - 3ml, BIO BLOOM - 5ml, TOP MAX - 4ml(as table of BioBizz).

Thanks you all share your thoughts with me

A few of my plants contracted the same thing going into fall while in mid flower. Started as little brown spots and the whole fan leave would then blacken at the ends and fall off straight dead necrosis. I was able to save the plants by cutting off the afflicted leaves. It was slow to attack new growth and since they were almost through flowering my yields were fine. Buds were fine. Had this happened in veg I would have lost them.

 

[whitebb2727]

as well check what your ppms coming out of your run-off.is? so you can copare to what you put in. as well.. see what waterPH is of run-off. ph is at 7? maybe 7.5? . this will help to see if posible you are locked out.

Don't check run off ph. It will make you chase your tail.

 

[Ofirk2]

Don't check run off ph. It will make you chase your tail.

Why not to check runoff ph? Last time i checked it was 5.8 5.9.
It gave the indication that soil ph is low isn't it? Because of this i watered her today with plain ph'ed 7 water.
As ppm i did not check at all and did not have a meter for that.

 

[whitebb2727]

Why not to check runoff ph? Last time i checked it was 5.8 5.9.
It gave the indication that soil ph is low isn't it? Because of this i watered her today with plain ph'ed 7 water.
As ppm i did not check at all and did not have a meter for that.

The proper way to check soil ph is to take equal parts soil to deionized water. Distilled will work.

Checking run off may be accurate in a inert medium. The more organic matter or even synthetic ferts affect it. A ph pen uses electrical current and Will be accurate in water or inert medium. The salts and organic matte affect conductivity and the reading on the pen.

Yours may very well be right but it can have you chasing your tail. I posted an article on here somewhere. I'll see if I can find it.

 

[420producer]

The proper way to check soil ph is to take equal parts soil to deionized water. Distilled will work.

Checking run off may be accurate in a inert medium. The more organic matter or even synthetic ferts affect it. A ph pen uses electrical current and Will be accurate in water or inert medium. The salts and organic matte affect conductivity and the reading on the pen.

Yours may very well be right but it can have you chasing your tail. I posted an article on here somewhere. I'll see if I can find it.

for me . ? im in coco . so if i feel i have a slow grower? i look first at my ppm going in and ph.... and if there is a higher ppm coming out. to me equals a lockout. or ph is higher than went in.?? locked out imo. not chasing tail on this... will flush with str8 water. ph'ed . wait a day and start feeding at 1/2 strength. nutes 5.8 ph. and see if she takes off.

 

[whitebb2727]

for me . ? im in coco . so if i feel i have a slow grower? i look first at my ppm going in and ph.... and if there is a higher ppm coming out. to me equals a lockout. or ph is higher than went in.?? locked out imo. not chasing tail on this... will flush with str8 water. ph'ed . wait a day and start feeding at 1/2 strength. nutes 5.8 ph. and see if she takes off.

As I just said that is fine in an inert medium like coco.

 

[Roger A. Shrubber]

if you've got higher ppm coming out of a pot of coco than you're putting in, you've been overfeeding for a long time building up salts. that shouldn't ever happen.

theres a "deficit" that coco starts out with, unless its been charged by the maker. it absorbs Ca., P, and K, until this deficit is filled, then these elements become very available in your coco. this typically happens in the 3rd or 4th week of flower and can lead to too much Ca and K locking out Mag. so adding cal-mag after the third week of flower may not be the best idea in coco. maybe back off a hair on the pk boost type ferts.
not pointing at you 420, just saying in general

 

[Weedgypsy]

Just went through this on my girls, fungus mites, Just use DE or something along those lines. Killed a small plant of mine last week. Started really slow and just kept going and going. Also make sure all light is completely locked out of the root zone.