Plant went from healthy to looking bad in 2 days, never seens this before

[Rendar1970]

I have no idea what is wrong with this plant. 2 days ago it looked healthy and happy with the exception of 1 fan leaf towards the upper end of the plant. It had what looked like a tiny bit of Mg deficiency forming. So I added a little bit of cal mag during that feeding. Well fast forward 2 days, and now the whole plant looks terrible. Most of the leaves have turned crispy and twisted. Most smaller leaves have turned completely yellow and white. They look bleached. However the plant is hair over a foot from a single 600w HPS, and none of the other plants its with are having this issue. All of the bigger fan leaves look like a mix of sever Mg or Zinc deficiency, but instead of being yellow, its white.

So im really at my wits end here. Here is 3 pictures so you can see what I am talking about. https://imgur.com/a/SVsGW



[FONT=Arial, Helvetica, sans-serif]How long has this problem been going on? 2 Days
Are you growing in a PVC grow tent? (example: Hydrohut or any other non brand tents) No
What system are you running? (DWC? Ebb flow? Aero? Water Farm? Flood Tables? and so on...) Flood tables using Grodan cubes for medium
What STRAIN are you growing? CandyLand
What was the establishing technique? (Were the seed or clone?) Clones
What is the age of your plants? Week 5 of flower after 2 months of veg
How long have they been in there mixture they are in now?(coco,soiless etc..) Transplanted to a bigger pot at start of flowering
How tall are the plants? 4.5 feet tall
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? Mid Flower
What Technique are you using? Main Lining
What substrate/medium are you using?(Hydroton, RockWool etc.) Grodan cubes
What is the Water temperature? around 65 degrees
What color are your roots? White? Brown? Are your roots slimy? White
What Nutrient's are you using?(If growing soiless) CNS17 Line from Botanicare
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful* 900 ppm of CNS17 Ripe
How often are you feeding? (If using soiless) Flood Table that floods twice daily for 15 minutes
How often are you giving nutrients? (If using soiless) Every Feeding
If flowering, when did you switch over to using Bloom nutrients? Yes
What is the TDS/EC/PPM you are using 900PPM
What is the pH of the "Tank"? Currently 5.9. I usually top off and mix nutrients then pH to about 5.5, letting it drift slowly to about 6.2 before lowering it again
How often are you testing your pH/PPM/EC/TDS? Daily
Are you sure your calibration is correct on your equipment? Yes
How often do you clean your system: example: Flush out water replace with clean water and nutrients? Every 2 weeks
What size bulb are you using? 600w HPS
How old is the bulbs you are using? 1 Month
What is the distance to the canopy? 1 foot 3 inches
What is your RH Factor(Relative Humidity)? 43%
What is the canopy temperature? 78
What is the Day/Night Temp? (Include flucutaion range) 73 at Night, 78 during day
Tell us about your ventilation, intake exhaust and when its running and not running ? Passive intake, Oscillating Fan inside tent, 6inch Inline fan extracting heat from light. Second 6 inch fan connected to carbon filter extracting from center of room
Is the fan blowing directly at plants? No, blowing over the top of canopy, enough for airflow but barely enough to move plants
Is your water HARD or SOFT? Tap water is PPM 160
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Tap water left overnight for Chlorine to burn off
If using tap water, what is the ppm/EC/TDS of the water right out of the tap? 160
Are plant's infected with pest's None that can be seen[/FONT]

 

[Rendar1970]

8 hours later. Now whole top of plant looks burnt to a crisp.

http://imgur.com/QliArNQ

 

[Vanilla Phoenix]

Damn. That sux. I would say light/heat burn. After you gave it calmag, and it started to really progress, I would've gave it a good flush with straight pH'd water and then finish the flush with a 1/4 strength nute solution to sit in. Also, would have moved it away from light to help recover.....little late now though

 

[corky1968]

Is somebody mad at you that has access to the plants?

Crop duster flew in and poisoned everything?

 

[northstate]

That looks like a reflector hot spot just blasting way too intense, magnified, and focused light
at your lady. Rotate her out and maybe raise your bulb 4-5"? Good Luck!

 

[DoubleTripleOG]

To me it looks like it's getting poisoned to death from too much nutrients. Maybe not, but I've killed my fair share of plants(in grodan, ebb and flow) , and that's what it looks like to me.

 

[Rendar1970]

I would've gave it a good flush with straight pH'd water and then finish the flush with a 1/4 strength nute solution to sit in. Also, would have moved it away from light to help recover.....little late now though

That was the first thing I did. I flushed her good and then gave her back a very light feeding. I raised the light about 6 more inches (so its almost 2 ft away now) and moved her to the edge of the group. Still fryed her.

Got 11 other plants total, 5 under the same light as her and getting the same nutrients as her, all the others are fine.

[FONT=Arial, Helvetica, sans-serif]To me it looks like it's getting poisoned to death from too much nutrients. Maybe not, but I've killed my fair share of plants(in grodan, ebb and flow) , and that's what it looks like to me. [/FONT]

Anythings possible I guess. I just dont think thats the issue since I have 11 other plants total, 5 of which are under the same light on the same flood table as this plant, and only she is having the problems. None of the other plants show this problem.

 

[BubbaBear]

The only time I've seen a plant go from healthy to being on its death bed in a just a couple days root rot was the cause. It usually effects the top of the plant first.

 

[chronosync]

Aww man it's shitty to see that but not so much since you have other planets too right?

Find out what happened and let us know I'm interested to know the cause.
A quick glance at your checklist and everything looks on point although I'm not familiar with your nutes.

I get plants once awhile and I have no idea what's up it seems they just aren't happy and I don't always know why.

Good luck

 

[ruan99]

How does the roots look? This looks like what used to happen in my hydro setup. A random tree every cycle would do this. The leaves keep dying and eventually the whole thing dies. I believe it was caused by something called brown slime algae. Which isn't an algae, but a bacteria in the water. It would wipe out a tree every cycle round wk 5. only thing I did to stop it completely is switch to soil. If roots are covered in a clear sort of slime and dying then I think this is your problem.

 

[Bongstar420]

Yes..too much light/heat/nutes

Root rot is what the guy above had..that will cause the similar excess in light/heat/nute response in plants.

 

[plutosmoke]

After assessing your mentioned environment, I doubt it has anything to do with nutes.

I have seen this before and I have done this to my plants before. The only mystery is that why is it only happening to that one plant.

Your plants look exactly like mines when i did it. What did i do? When i combatted spider mites I fogged my area. Only I didn't used a fogger, i used a fumigating fogger. The vapors that was able to get to my plant did exactly that, made the leaf turn white shriveled within the next day. The plants was still able to come back with the new shots coming out but it really stunned the plants. Any plants that wasn't close to the fumigator was still green.

Have you been spraying anything on the plants?

 

[PoweredByLove]

how do so many people not know what nute burn looks like?