Super Skunk leaf damage - Caused by what??? HELP!

[newbie2006]

Weird looking damage on my leaves.. What is it, do you know?

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All affected are Super Skunks from this one system. Two other systems are running the same stuff with different strains without any problems.

Here are some questions that I answered so you could have a better idea what has been going on:

How long has this problem been going on? Few weeks now

Are you growing in a PVC grow tent? No

What system are you running? Ebb&Flow

What STRAIN are you growing? LSD, Super Skunk and Zamal x White Widow

What was the establishing technique? (Were the seed or clone?) Clones

What is the age of your plants? 60 days

How long have they been in there mixture they are in now?(coco,soiless etc..) Whole time

How tall are the plants? around 35-40cm

What PHASE are the plants in? 12/12 been on about 36 days.

What Technique are you using? Ebb&flood, RW cubes on top of 2,5cm (1 inch) hydroton layer

What substrate/medium are you using? RW and hydroton

What is the Water temperature? 18-20C

What color are your roots? White? Brown? Are your roots slimy? White 99,5%, some brown somewhere but the enzymes are hacking those parts up pretty quickly.

What Nutrient's are you using? Lucas Formula, fed it week into flower then added AN Big Bud, Bud Candy and B-52 plus Grotek Pro-Silicate and HESI Supervit and Bio Nova BN-Zym enzymes. Plus in veg I foliar fed Very High Output from Advanced Nutrients, according to dose almost but in the last 3 days of veg I gave them already the 1200ppm full dose sprayings.. Right now going with only Overdrive from Advanced Nutrients.

How much of each nutrient are you using with how much water? According to directions

How often are you feeding? The pump is on once per 3 hours, 10-20mins, so 4 feeds per 12hrs

How often are you giving nutrients? Every feeding

If flowering, when did you switch over to using Bloom nutrients? About 4 weeks ago

What order are you mixing your nutrients? First the lucas, then the rest, last pH down adjustments.

What is the TDS/EC/PPM you are using? About 500-600ppm

What is the pH of the "Tank"? 5.4-6.5 adding pH down every now and then when it gets too high over a period of a few days.

How often are you testing your pH/PPM/EC/TDS? Every few days.

Are you sure your calibration is correct on your equipment? Yes.

When was your last watering? An hour ago I think

What is your water temps? 18-20C

When was your last feeding change? Roughly a week ago when I added the Overdrive, went with Lucas before that for a few days as I made a complete changeover to the rez.

How often do you clean your system: example: Flush out water replace with clean water and nutrients? Change all nutrients and water every month or so

What size bulb are you using? 730w sulphur plasma, LG, 4500K

How old is the bulbs you are using? Few months

What is the distance to the canopy? About 60-80cm

What is your RH Factor(Relative Humidity)? 10-30%

What is the canopy temperature? 22-25C

What is the Day/Night Temp? 20-25C

What is the current Air Flow? Free flowing ventilation, door open to growspace

Tell us about your ventilation, intake exhaust and when its running and not running ? No mechanical ventilation

Is the fan blowing directly at plants? Occasionally

Is your water HARD or SOFT? Soft

What water are you using? Tap

If using tap water, what is the ppm/EC/TDS of the water right out of the tap? 0.2 EC

Are you using water from a water softener? No

Has plant been recently pruned, cloned off of or pinched? No

Have any pest chemicals been used? If so, What and When? No

Are plant's infected with pest's? No


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Hope someone knows how to fix this before this goes worse!

 

[newbie2006]

Someone said Mg deficiency?

Is this correct or not?

 

[Midnight]

Someone said Mg deficiency?

Is this correct or not?

This looks like a Manganese problem.

 

[Steinawitz]

Have you looked at the underside of the leaves for any pests? This appears to be Spidermite damage. Use a magnifying glass if you have one handy. Spidermites are very, very hard to see with the naked eye (but you can still see them with out magnification help if you look closely).

 

[newbie2006]

This damage is not caused by spider mites for sure. I have a degree in horticulture, and can be 100% positive that this is not a spider mite problem.

How to solve this, if it's an manganese problem?

I have magnesium in a bottle, but no manganese... Only thing that I have that has it is FloraMicro, which has an NPK heavily based on N, which would probably ruin my flowering...

How??? PLEASE OPINIONS!!!

 

[Hazy Lady]

It looks like thripps on the first two pics, I don't have a degree in Horts but I did just have thripps!. One spray of Avid cured mine, look for tiny black speckles along with the rasps on the leaf, if you find black specks it's thripps.

 

[Unclepeter]

has it shown first in the older leafs? if so add the epsom salts or such like...

I have a degree in horticulture, and can be 100% positive that this is not a spider mite problem.

but you can't determine its Mg deficiency!

 

[newbie2006]

No thrips here. Maybe trips. But no pests ;D

Yeah its only in the older leaves..

Should I give the Mg to the reservoir (and how much?) or just spray it as foliar feed - can I spray lights on without worrying about burning, or only spray after lights go out? Which one would be better approach?

Unclepeter: I know, I toked way too many joints when doing the degree.. ;D

 

[Unclepeter]

No thrips here. Maybe trips. But no pests ;D

Yeah its only in the older leaves..

Should I give the Mg to the reservoir (and how much?) or just spray it as foliar feed - can I spray lights on without worrying about burning, or only spray after lights go out? Which one would be better approach?

Unclepeter: I know, I toked way too many joints when doing the degree.. ;D

it could be PH related.. noticed yours seems to go between 5.4 to 6.5? or lock out caused by something else... I wouldn't just add Mg ..maybe stop adding the ph down.... see how it the level comes up .. ph should go up as the plants intake increase...

I don't grow hydro so hopefully someone else will chime in...

 

[Stress_test]

It does kinda resemble thrip damage but without the tell-tale slime trails.

No I would say possibly Mg def. But it looks a lot like nicotine/cigarette poisoning the way the leaves are deforming.

Tell whoever is smoking cigarettes in your garden to knock it off cause your plants hate it.

 

[newbie2006]

No cigsmoker has been in my grow space..

I've sprayed Mg as a foliar feed for a couple of times now, in the mornings.

 

[RidgeRebel]

i think this might just be something this plant does now that i see yours. about 2 weeks after my seeds surfaced i had the exact same marks on my leaves as your 1st two photos. altho my first thought was thips or some other pest, i found after thorough examination, there was no solid evidence of any infestations of any kind. i cant say for certain what caused it, but what i did was flushed and hit em hard and forgot all about it until i saw this post. the 3rd pic looks like what i get when a plants in a hot spot.