Can't Figure IT OUT!!

i am having trouble figuring out what is going on with my plant. slowly all the leaves are starting to look nasty with brown spots on them. help me please !!
also eventually the leaf will turn completely yellow with the brown spots on them.

What is your soil runoff PH at?


.

last time i check it was at 6.3 before it used to be 5.5 maybe i should flush them again? when the soil run off was 5.5 i flushed the hell out of it until i got a reading of 6.3 but it has been a week or so since i did it. Maybe it has some kind of nutrient lock?

bump.............i have plenty of pics posted anyone have this kind of problem?

Yeh, doesn't look like the work of mites or other little critters, IMO...are these plants indoors? All I can say is flush, then just water with phd water for a week and see what happens... :-/

yes it is indoors. What should the ph of the water be? 7.0 8.0?

i also watered the plants sunday do you think it is ok to flush them now?

i just checked the soil and its still moist from the top of the soil.

I'm having the same problem too. Thought it was due to a fungus gnat infestation, but it could be because of the phosphate buffer I used. After the gnats went away I figured it was either the buffer or the nutes I was using (schultz 10-15-10 at 1/4 strength every other watering 1-2x/wk). I decided not to stress plants further by trying to flush, especially if the buffer is the problem--right now I am just watering with buffered water and no nutes and I'm gonna see what happens.

I think the normal philosophy is that overwatering will cause less damage than the nute burn. Dunno, but i've been having this problem for a couple of weeks and nothing had died yet so you can probably wait till they are dry if you are worried about killing your plants with too much water.

What kind of damage can gnats do to the plant? i know the larvae eat the roots but how about the adult ones that have wings? Do they eat the leaves maybe? or suck the juices out of them creating those brown spots? i also wonder if its the nutrients doing that. i did flush my plants until the run off water was at 6.8 ph. but that was 2 weeks ago and this problem is still continuing. Ill just water them instead giving them nutes and see what happens.

Do you have pics by any chance?

I don't grow in soil, I use hydroponics but I think 7.0-8.0 on PH is way to high. In hydro it should be 5.8-6.3 PH. Maybe soil is different but hope that helps. It looks like nute burn to me or a high PH level in your water.

yeah i grow in soil and i think the runoff water from soil should be between 6.2-6.8 also when i water my plants with nutes i make sure i ph it to 6.8

I read that in soil pH should be from 6.5-7.0, so I'm on the borderline, but it should be alright. It's better than it was from my tap water, at least.

Fungus gnat larvae eat the little root hairs on your plant when fungus supplies are low. This is supposed to look like some kind of nute deficiency, but a lot of fungus gnat threads I've read don't report any damage. The adults look like normal fruit fly type gnats, and the larvae are little tiny white or clear wormlike things that crawl around and live in your soil. If you aren't seeing any gnats, I wouldn't be too worried about them. I don't have pics or I would have posted a thread earlier. I was gonna try to change my water systematically before i resorted to buying a camera and asking the forums.

If your pH is ok plain water sounds like a good idea. Hopefully things will improve.

Yeah i am just going to flush them and just water with plain tap water and see if things improve.

Good luck!

Thanks mate. I hope your plants get better as well.

420ben i have the same problem every cyle. i start noyicibg the brown spots 3 weeks in to 12/12. this is my 5th grow and there back right on scheduel 3rd week. i have posted and tried to find out what it is. mostly folks say its magniseim def. or rusty fungus.or to flush. i have tried many things. the good news is your buds will be ok. its seems to be astetic problem. im sure you will loose a lttle weight but i always make to the end. if i find out i will pm you and let you know. or if you find out hit me up. good luck

thos plants are seriously burned, dont feed them nutes for weeks

i think you might want to check into calcium deficieny....thats what it looks like to me......try cal-mag.