Spots on leaves spreading by the day....possible cause and solution??pics

Hi guys! Long time lurker, few time poster. I normally try to find answers myself, but this problem seems to be above my level... Really, I just cant pinpoint my problem with 100% accuracy. Before I try to get ahead of myself and try to start fixing everything, I figured I would give my boys @ roll it up a chance to throw some input my way.... So have at it guys.... whats wrong with my leaves...

It started with 1 leaf last Wednesday(6-13-12) and I didnt think it was a big deal. I came back 2 days later, I try to water every 3 days (when the pots light) and noticed about 8 leaves like that. Now i have nearly 70% have the spots on it. 90% of the large fan leaves and its starting to progress to the smaller leaves.(6-17-12)




Type- Trainwreck x MK ultra
Cycle- Flower 12/12
Day- 65 total/ day 21 of flower
Soil- FFOF cut with light warrior
Soil pH- I've havent done a run-off test
Water pH- 6.5 ( my meter just got to the point where i cant turn the calbration screw back anymore. So I picked up a bluelab)
RH- 38% day and 76% night( since its sealed, i have a 3 inch desk fan and 2 mini dehumidifiers inside the tent and a big unit on the outside)
light- 400w sealed and cooled
exhaust- 6" Vortex

You didn't mention what nutes you are using. I would lower that nighttime RH to 60% or lower during flower. It looks like you have a phosphorous deficiency which can be caused by not enough food during bloom or too much of certain micro-nutrients built up in your soil locking out phosphorous. If your water ph is 6.5 I would bet the actual ph of your soil will be lower. I try to ph my water at 7 or used distilled water which is naturally ph'd at around 7 because as it leaches through the soil the ph lowers. Test your ph in the soil itself then the runoff and compare. Knowing what you are feeding her will help a lot with the diagnosis too.

I using the whole Fox farm line bb,gb,tb,os,beastie b, and cc.

I am currently putting in .5 tsp of big bloom, tiger bloom, and 1/8 tsp of beasie bloom.

jpockets420 said:

You didn't mention what nutes you are using. I would lower that nighttime RH to 60% or lower during flower. It looks like you have a phosphorous deficiency which can be caused by not enough food during bloom or too much of certain micro-nutrients built up in your soil locking out phosphorous. If your water ph is 6.5 I would bet the actual ph of your soil will be lower. I try to ph my water at 7 or used distilled water which is naturally ph'd at around 7 because as it leaches through the soil the ph lowers. Test your ph in the soil itself then the runoff and compare. Knowing what you are feeding her will help a lot with the diagnosis too.

Click to expand...

Cool. Thanks for the quick reply man. I'll check the runoff.

Looks like P & K. 38% is quiite low RH and encourages over transpiration too, so the plants are drinking but not using the nutes. Ur RH is quite wide. You didn't mention temps so I guess they drop quite a bit at lights off to cause the high RH. Those leaves with more than 50% damage can come off. Waste of the plants energy to repair.

Its very hard to diagonose problems with plants(alot of issues show the same signs) Flush, flush and flush. As long as the new growth is fine then no real need to worry