Hi

Plants are in veg, RDWC bubblers. Feed 0.8ec, ph 5.5 to 6.2. EC stays stab.e and i let ph rise through full range, topping up with 0.8ec/5.5ph.

Roots are nice white and plants growing well. Temps fine BUT humidity low at 30%. Spray them daily with water/ V light feed mix.

It looks to me like a ph or overfeed but all levels telling me otherwise, they have been in bubblers one week and the ec is starting to drop to 0.7 so telling me plants need more food if anything ????

Any ideas peeps ?? The first pic makes it look totally different to what the eye sees under hps mind you..

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Cheers

And there could well be your problem

Owd

Right not sprayed them for days and they are getting worse !!!! New growth starts of fine though ?

Could this be a Magnesium deficiency ? Would epsom salts work ??

Any ideas ???

Ta

it looks like leaf spot fungi? i had a few leaves like that in my last crop and i thought it was leaf spot fungi it looked just the same. this crop i cleaned all my fans really well and i havent had it at all to think of it.
give it a go! you have just helped me out i think

The leaves are just crisping up now and dying !!!! Everything else seems fine, i was given cuttings and they were not from a clean enviroment.....

It looks like Mg deficiency to me but i doubt i would get that in Hydro ??

There again it also looks like 'rust' which i know from my roses, this is also a fungi...I used to treat that with a general fungus spray containing myclobutanil.

Could i try some of that as a one off ??

Have you tried increasing the EC a little?

ATB

Stan

have been thinking of that but ec is around 0.7/0.8. leaves are yellowish though....with green at centre of veins.

Help !!! Please peeps, don't know what to do. ???

Roots are huge/white, ec still stable but developing these spots and spreading, leaves hen going crisp/dying.

Is it -

LSF

Nute lockout/Mg deficiency.

Low humidity ?

They are growing like hell but new growth develops these tiny spots which just grow/join.

Even thinking of trying a Hotbox Sulphate

Or flush with Epsoms and try lower ec ???

Totally lost...

Whats you enviroment like are they getting enough Air

r ur nutrients old and what r they??????? is your water hardwater or soft water? maybe clean your fan blades off i did and it got rid of my problem which looked the same as yours. what system r u growing in? have you got more clear photos? ones of you whole grow room and setup? maybe you fans not powerful enough. it could be anything.

Got 10" out to stack and 8" in. Both on variable control. Also on thermostat (both fans full speed at 27c) control so temps spot on as is airflow. Also have 2 oscillating fans on constant at either end of room so plants 'moving' about.

Humidity 40-70.

Intake taken from roof eaves.

Room is spotless, mylard walls/ceilings, white mylar floor. Will get a pic of a plant if can.

Using brand new bottle of Ionic grow at ec 0.8. (they were on 0.6 in cloner) and also add regen a root at half dose.

Got 8 21l bubblers in rdwc with main res outside growroom to keep temps down.

Couple more pics, i have sprayed them with Fungus killer and removed a load of the worse leaves, the older damaged ones are now very crispy????

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you must have dirty air coming from somewhere. i dought its the way your growing or your nutrients. wheres your extraction fan blowing to after it sucks it from the eves?

Directly into room at furthest end away from outake. It is virtually outside air as the eves are very slightly open to the elements. I have no filter etc.

Do you think i have an infection of some sorts ?? I do have filter material but never got around to fitting it and at best it would only block bugs etc

Could this be fungal ?? I have had these tiny brown spots since they were in my prop though in a totally seperfate box ??

so you have got air coming into your growroom and thats it? you should suck the air out of the grow room and out though the eves. make sure you use a carbon filter else they will stink down the street when they start to bud!

Sorry mate did mention above got a 10" out to my chimney stack through a 10" rhino filter.

Going to flush them for 2 days with plain water ph 5.6, got nothing else to try ?????

Then feed with 0.4 and see what happens, they SHOULD eat it up and my ec should drop as roots are huge now.

This has got to be a nute or fungus issue ????

Also just came across this pic in Mg defiency sticky. The leaves on left are starving of npk the ones on right just Mg.

From this pic it is telling me they are just hungry but my ec is stable...
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I'm having a similar problem:



Anyone have any ideas as to what this might be? This happened when the plants went unwatered but since then I seem to still be getting the problem. There's also a bunch of gnats in there which I've treated with gnat-off... might these be part of the problem?

hi i hav just had the same type of problem to u after doing loads of searchin on here i thought it was a iron def cos a few have said that iron def starts at the top of the plant and mag def starts at the bottom but hav a look see if it is that some one mite say am wrong but just my 2 pence worth but i hav been lookin for the answer to it for a month or more but mine had only started happenin since i changed nutes even tho my friend uses the same an has no problems but look up iron def aswell see if it is the same

Mine just starts on all new growth. I have taken samples to a local grow shop and they are adamant its some form of fungal infection...

He has some stuff in shop which i can look at on Monday, not sure whats in it though.

They said start again or try combat it...

I have got some Systhane fungus fighter containing Mycobutanil and drenched the plants, i know this stuff is systemic so only using in early veg.

They also do a product named Dithane which protects once under control.

I also had a browse in local garden centre and found other Fungus control products containing Penconazole and Triticonazole.

Now i know these are nasty stuff but if i can kill it early in veg and somehow keep it under control alls good.

I also have access to a Hotbox Sulphur thingy.

Anyone used any of above ??

Think i may start a new thread.

it's not LSF, i think i have the same problem too

The fact that the EC remains constant, but the plants show signs of hunger suggests the possibility to me that there's a problem of nutrient uptake at root level.

Which leaves me puzzled since you say that they roots are strong & healthy... otherwise I'd be considering some sort of root infection...

ATB

Stan

pythium is very sneaky. Roots can remain white, thick and healthy looking but they can be infected.

Didn't want to mention the 'P' word... I'm just recovering from an attack myself so there's a fair risk I'll see it in others' plants too...

Could be lock-out due to some other reason - but the EC & pH wouldn't lead to that conclusion...

ATB

Stan

Well to experienced grow shop owners are adamant its fungal....

As you say everything 'looks' perfect. EC 0.8 and ph has full range from 5.5-6.2. Which rises over a week.

I also add RegenARoot and the roots are huge/white.

Will see what happens after a spray of that fungacide, nothing to lose as still in veg.

Cheers

Hi takeiteazy,
I have had a few brown leaves on my plants. I am using an anti fungal spray just incase. Its called Diathane. It is only about 6 quid and makes about 14 Litres. Look at the leaf spot fungus info on here and it gives you a few pointers, but thats what it looks like to me.

Regards cain1.

PS I think I accidentally took it into my grow room on my shoes. Know better next time. The plants are still doing good though so fingers xd. You should also remove infected leaves and spray weekly.

Yea i have the Dithane but think it'd more of a protectant/control than killer, my plan is to kill it then protect with essence. After a good spray 2 days ago the new growth SO FAR has no spots on them......I have also been removing the severely damaged leaves daily and they are 'looking' better so far....

Also just found this while reading up on Fungus Fighters..

'Leaf spot is a fungal disease that causes large, unsightly brown or black blotches to appear on the leaves and stems. Spots also occur on the flowers and lower stems, and infected stems may wilt above the point of attack.
There are no specific fungicides available to amateur gardeners to control this disease. The fungicides myclobutanil (e.g. Bio Systhane Fungus Fighter) and penconazole (Scotts Fungus Clear) may give some control of it.

have you tried wiltgaurd? i blocked my plants once and didin't know what to do and wiltgaurd unblocked them.

why dont you buy a new set of nutes? i wouldnt go back to the same shop though,

maybe the bloke in the shop gave you some nutes which have been on the shelf for too long and there out of date and giving you problems?

Sorry mate don't know what your referring to by 'blocked' ? I had my nutes from Greens and also had some for a mate, same grow style/strain/levels etc and his are fine.

I would say this is not fungal at all.

I think you have a bad case of calcium deficiency. Calcium and magnesium are closely linked with nutrient uptake and a problem with one often causes a problem with the other. One part nutrients like your Ionic are a bitch for calcium issues as calcium phosphate or clacium sulfate commonly precipitate out of the nutrient, this is why most good nutrients are in 2 parts.

Also, are you shaking your ionic up loads before adding it to the tank? If you not shaking it you could be leaving some of the nutrient in the bottle as one parts usually separate out a bit, particularly the clacium. I had this problem once with vitalink easy one part nutrient.

What is your background EC? If your in soft water then this may be making the problem worse as there will be low levels of calcium and magnesium in the water. If your background has an EC 0.2 then you only adding 0.6 worth of nutrient, this is way to weak imo.

I would up the EC slowly to 1.2-1.4 and spray with something that has loads of calcium like BioBizz Alg a mic or vitalink foliar feed. Perhaps consider changing to a decent 2 part nutrient like canna aqua or vitalink max too.

Cheech

Cheers since spraying them with systane and dithane they have come on awesome. I also have given them a spray of Nitrozyme and they are know free from spots and growth is lush/green...

Got to say impressed with Nitrozyme and will see if i can get some Vitax or liquid seaweed.

They are also starting to eat more and i have upped my ec to 1.0 after it was dropping from 0.8 to 0.7.

Cheers guys.