Fan leaves problem

[AloeRuss]

hi. This is a problem I am experiencing for the first time this early into the run.
All my plants are absolutely gorgeous. No signs of deficiencies or sickness.
However, some plants, although being looking good and healthy otherwise will develop one or two fan leaves that first show brown spots, then curl up and eventually dry out. After I break it off, plant continues to grow. Then another leave goes through same thing. All this during last week of veg.
I grow in grodan cubes
PH 5.8
Use Flora Nova series and some CalMag.
Never had this in years.
Is this serious?

 

[madvillian420]

ive had a couple leaves do this to me on my current grow. My temps have gotten pretty high a few times and ive had a constant low humidity. I also killed a leaf or two by doing some sloppy watering with the lights on

 

[Medicated Bonsai]

Leafs look a little toasty. What’s the climate in your grow area?

 

[AloeRuss]

77-80

 

[AloeRuss]

Could it really be the temperature?
It only happening on largest and oldest fan leaves. New ones do not have a hint of a problem.

 

[Medicated Bonsai]

LED? Those temps should be fine, I usually keep my temps from 72-81 and everything seems to be ok.

Hopefully someone more experienced can chime in, good luck.

 

[hotrodharley]

hi. This is a problem I am experiencing for the first time this early into the run.
All my plants are absolutely gorgeous. No signs of deficiencies or sickness.
However, some plants, although being looking good and healthy otherwise will develop one or two fan leaves that first show brown spots, then curl up and eventually dry out. After I break it off, plant continues to grow. Then another leave goes through same thing. All this during last week of veg.
I grow in grodan cubes
PH 5.8
Use Flora Nova series and some CalMag.
Never had this in years.
Is this serious?

Have you always grown in rock wool?

http://www.just4growers.com/stream/...s/growing-in-rockwool-tips-from-the-pros.aspx

 

[AloeRuss]

Have you always grown in rock wool?

http://www.just4growers.com/stream/...s/growing-in-rockwool-tips-from-the-pros.aspx

Yes sir. Last 4 years every run.

 

[AloeRuss]

Could it be strain specific?
Or old CalMag I use (but anything food specific would show up on more then few fan leaves)
I just don’t know what to think.

 

[hotrodharley]

Yes sir. Last 4 years every run.

Are they experiencing wet/dry conditions? Some strains can’t tolerate that without pulling nutrients needed for new growth. Hence the big fans.

 

[AloeRuss]

Nothing out of the ordinary. Very damn confusing. Real problems wether with ph or food manifest themselves in a much different fashion.
It never affects 1 or 2 fan leaves on quarter of the plants.
But I really need to know.