rust patches!!!!!

[shuggy4105]

hi folks, i`m getting no responses in the "sick plants and problems" section.
my problem being "rust spots".
i`m a soil grower with a 400w hps,the gals are 5 weeks old and this problem came to my attention around a week ago.
the top of the plant is lush green, but the bottom leaves are green-yellow (see pic)with rust-like patches on them. at first it was just the one girl i noticed it on. however, now 3 more are showing the same signs, apart from the green-yellow leaves which are restricted to the 1 plant, the plant i initially noticed the condition from.
i`ve been looking through the sticky`s, and i think it could be a manganese and zinc defficiancy, due to high ph i pressume.even though i use ph balanced water of 6.4., although on ocassion i have used my tap water which i know is "hard".
here`s a pic of the condition, and the plant which has the worse case of it.....let me know your opinions man. your help is greatly needed.

 

[rollingstoned77]

hey man , i'm currently having the same issue with my plants . they are around 4 almost 5 weeks old also . same deal started on 1 plant and has now spread to a few . i am thinking it is the Ph . I also use Ph 6.4 water to water with , but the soil , nutes , and other things in the pots change your Ph after watering . I think my Ph is too high in the soil . I backed off the nutes and been using straight water for past few days .I used distilled water to flush the pots the otherday . Also was brought to my attention that this could be a mold or fungus . I'm growing in my basement and they deffinetly dont get the AIR FLOW i'm sure they need . Im now putting a few drops of lemon juice in my water to bring DOWN the Ph . And have been running the exhaust and fans more often .
If this all works for me i will keep you posted . Hope your plants come around dude !!!Good luck , i will check in from time to time to see how you are doing . MAYBE we can help eachother !!


PEACE

 

[shuggy4105]

yeah man, looks like the same, though my ones don`t have it so much at the edges.
i`ll keep ya posted too man.
thanx for the reply dude, it`s terrible trying to get an answer on the sick section.
cheers
Shuggy:bong1: :bong1: