Serious Problem, please help

[Oski]

hi

could anyone tell me what might be causing these leafs problems please?

they are at the bottom of the plant but it works its way up.

growstyle is DWC, ph is 5.5-6.0, res temp is a steady 68F, room temp 75F, humidity 50degs, res ec 0.9 fed with canna aqua flores.
before the leaves drop, they become completely necrotic.

this problem is happening in both my veg room and flowering room.

i think its fungal or mg def, but im not sure.

help much appreciated, thanks

[c-ray]

a type of fusarium maybe I dunno...might be a good idea to supplement with potassium silicate if that is the case
what is the starting ppm and pH of your water?
how is the airflow and air circulation in your room and how cool does it get when the lights are off?

[Oski]

a type of fusarium maybe I dunno...might be a good idea to supplement with potassium silicate if that is the case
what is the starting ppm and pH of your water?
how is the airflow and air circulation in your room and how cool does it get when the lights are off?

hi

the ph of the tap water is 8.3 and the ec is 0.2.

the airflow is good, two fans blowing air in and 1 big fan extracting.

if it is fusarium how do i treat it? whats potassium silicate?

thanks

[The Cannarchist]

Picture of roots please.

[Oski]

hi

the roots are lovely and white.

ive taken more pics from plants that this problem is also affecting in the grow room. these are young plants, the roots are perfect.

ive filled in a questionnaire from another site, hope this provides enough info.


HYDROPONICS:

What STRAIN are you growing? mandella kaichakra and other mandella strains
What was the establishing technique? (Were the seed or clone?) rockwool
What is the age of your plants? 5 weeks in veg
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? veg but also affecting my flowering plants in flower room
What Technique are you using? DWC
What substrate/medium are you using?(Hydroton, RockWool etc.) hydro, DWC
What is the Nutrient temperature? 68F
What Nutrient's are you using? Canna aqua vega and flores
What is the TDS/EC/PPM you are using? 0.9
What is the pH of the "Tank"? 5.8
Are you sure your calibration is correct on your equiptment? absolutely sure
When was your last watering? i top up every day to maintain correct water level
When was your last feeding change? (ie. grow-bloom-micro-additional) once a week
What size bulb are you using? flo's in veg, HPS in flower
What is the distance to the canopy? 2" under flo's, 18-24" under HPS
What is your RH Factor? 50degs
What is the canopy temperature? 75F
What is the Day/Night Temp? (Include flucutaion range) 75F constant in veg, 76 in flower day, 72F in flower night
What is the current Air Flow? (cfm etc.) 160L extract, 2x150A intake
Is the fan blowing directly at plants? no, oscillating over plants
Is your water HARD or SOFT? 0.2ec
Has plant been recently pruned, cloned off of or pinched? yes, light pruning to keep height down
Have any pest chemicals been used? If so, What and When? no
Are plant's infected with pest's - no




please someone help, this problem has been going on for 3 grows now.

[The disclosure]

What kind of foliar applications did you do my friend?

[The disclosure]

If you are a med patient, caution with potassium silicate as it can cause lung silicosis...so i heard......
Cheers

[Oski]

What kind of foliar applications did you do my friend?

i have used fungicide once so far as i think it could be a fungal problem. this was done as soon as the plants were old enough (about 4 weeks).

[The Cannarchist]

You are basically showing symptoms of root rot ,hence why we all asked what is going on down below.

Fungus rot on cannabis leaves is rare as rocking horse shit.

in the mean time back off your PPM to 400 ppm.

[The disclosure]

What he said:stir:

[Oski]

i understand.

you think 0.9 ec is too high? what ec should it be? 400ppm at 0.7 conversion is 0.6ec, plus the 0.2 from my tapwater, so are you saying the ec should be 0.8ec instead of 0.9?

sorry, ppm's are alien to me, i understand ec's better.

thanks

[Lungus]

i understand.

you think 0.9 ec is too high? what ec should it be? 400ppm at 0.7 conversion is 0.6ec, plus the 0.2 from my tapwater, so are you saying the ec should be 0.8ec instead of 0.9?

sorry, ppm's are alien to me, i understand ec's better.

thanks
Pull your plants up so you can see the roots. They should be all white. If you see brown patches you've got root rot and that must be dealt with or the plants will die no matter what you do with the ec. Just keep the ec low for now until you figure if you've got root rot. If you do have root rot go to the Ask Lucas thread and see what he says about fixing the problem.

[Oski]

roots are fine.

anyone else help please?

[The disclosure]

OK, to me, all of the leafs on the pictures in the first post look like when you apply a product that coats the leafs and clogs the stomata (neem oil, etc...) because it has not been washed off the day after maximum....

When the lights are at optimum distance and the medium is optimum, your plant is trying to rev and it,s just stiffled in some spots where the sprays where heavier or repeated and that shiny oily coated look with necrosis is what happens....

The other sets of pics look like a calcium or micro prob to me.....

Just trying here....
One

[Oski]

thanks disclosure.

how would you recommend i fix the micro or calcium problem? more or less nutes?

[Oski]

i changed the res and reduced the ec from 0.9 to 0.8 and also gave them a foliar spraying of epsom salts.

[The disclosure]

I would recommend that you buy a good micro-nutrient complex like Power pack
from CHT or Advanced cal-mag or botanicare cal-mag and apply a foliar spray with clean fresh water once every 4 days for the next 2 weeks.

[The disclosure]

i know alot of people use epsom salts and i might get cruxified for this, but i would not use that, especially when using a balanced formula like canna...
Just my gut feeling...:whisper:

[ghostryder]

you do have a mag def! epson salts will aid this but pick up some cal mag plus from bionacare or biotanacare, cant remember spelling and use this either in the tank or foliar. it will supply calcium, magnesium, iron, sulphur and a few other trace elements. veg run at ph 5.8 to 6.3. i think 5.8 is perfect for flower but you should be higher for veg. water temps are a little bit on the cool side; bring it up 7 degrees to around 72 F. any1 differ?

its your crop but any1 who says but oils on your plants is a coo koo IMHO.

[The disclosure]

any one who says but oils...???
what do you mean exactly?

[ghostryder]

IF YOU USE ANY OIL and then remove it - no problem. but i've seen way too many crops with burn damage to recommend it IMHO. epson salts can be added to the soil medium to to be effective

[The disclosure]

Yes you are right AT,
If one must use it, half dosage would be recommended...

[ghostryder]

i have used NEEM OIL and it works on spider mites by suffocation but then you must take the oils off so that the leaves can work properly for photosynficyst or however you spell it. then repeat in 4 days to get the eggs hatching