Leaf Damage

Hi,

Here are a few pics of damage to some of my plants. growing indoor under a 400w lamp. Good air flow and humidity. 3rd week of flowering.

It looks like mite damage but I haven't been able to see any in action. Could someone offer some help?

What is your humidity and temps?
In week 3 you still have time to apply a prophylactic neem oil spray. Fungicide 3 sold at walmart is a neem product. IT is a miticide and protects against other types of damage such as mold and insects. Be careful not to overapply, and raise the lights for a day or so after use.

humidity stays steady around 55%. Haven't been able to get it any lower even with a dehumidifier running. Temps stay around 82 during the day and drop 10-15 degrees at night. No heating pads.

Are you thinking it's a fungus issue? Thanks.

Well I'm not ruling it out, although mites could certainly be an issue. Plus once you breach the leaf's protective waxy cuticle, disease can attack much more easily.
You may very well be having dewfall at 'night'.
Are you running your day/night on the opposite cycle as the REAL day./night? That can help control your temps and avoid dew.
Either mold or mites, neem is a great tool - it leaves a waxy residue and really protects the leaves- and you only have a few more days to use it before the buds start putting on mass, after which time you can add an unpleasant aroma to your product.

The night/day timing makes sense but I'm on day/night right now. Next grow for sure.
They're growing in the same room as the furnace. I'm venting out the furnace stack. I think the central AC running is making things worse in the room by raising humidity.
I moved a turboair fan down there today and clipped some of the bottom branches that weren't heading anywhere. The fans blowing across the bottom and a circulating fan is hitting plants head on.
I'll grab some of that neem oil. Cheers.

good idea removing branches in the stagnant bottom.
and central air... where does the water go from the unit? is it located indoors or out? AC lowers the humidity in the rooms it is cooling, and sends the moisture to wherever the heat is going... usually outdoors... i have never heard of one running in the cellar like that, but it's worht looking in to.
oh- and if you want to swap day/ night, an extended dark period is safer than an extended light period. I have done that before with no ill effects, and greenjeans did it when she moved her grow to her new house... just wait for lights out, unplug everything, and adjst your timer... then plug back in when you want 'day' to begin from now on.

The AC is outside with pipes running to the furnace for air circulation. I thought it removed humidity too but the humidity in the room seems to go up when the AC is running.
doh - Probably the weather getting hot and muggy hence the AC running more often. duh.
Good to hear about the light change.
So tonight, I can change to night, leaving it unplugged for the night so there's 24 hours of dark. cool

24 hours dark is FAR safer than 24 h light!
someone may disagree but that's how I have done things and not seen herms as a result. a very twitchy strain/ line may react though... just a small disclaimer...

I decided against the light change and instead moved things around to increase airflow. The dehumidifier is now blowing exhaust air onto the plants. I chickened out. I might as well finish this one as is and change for the next grow.
Grimey as it might be I took some of the tiny buds from the cuttings I took yesterday and dried it out. Different buzz but still a buzz :p.

Thx for the great info stinkyattic.

Update:

I had to chop one of the plants down. Most of its leaves succumbed to the damage so best to get it away from the others.
The store I went to didn't have neem in stock so I went with Garden Sulphur - fungicide miticide. Just finished spraying and moving the light further from the plants. Cooler, drier weather and the Sulphur should keep the problem under control.

I think I'll be growing at a different time of year next time. Fall/Spring flowering would probably be better for temps and humidity.

Hey,spots are an indication of mites or thrips which i don't see...so i think ur in the clear with that........looks like nute burn,but more likely water burn from excess dew or condensation on your leaves,maybe ur foliar feeding...? Just be careful about getting excess water on ur leaves and look for and prevent any further problems with getting it on them....and ull be ok...later man.

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Originally Posted by bestgreenthumb

Hey,spots are an indication of mites or thrips which i don't see...

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Look at the shot UNDER the leaf. Do you see the eggs?
That's not nute burn. That's physical pest damage.
Why are you bumping a thread from last JUNE? Those plants are long harvested by now.