Yellow spots on leaves

Discussion in 'Sick Plants and Problems' started by parkuser, Oct 31, 2013.

  1. #1 parkuser, Oct 31, 2013
    The plant is 2 weeks into flowering. It is being grown in DWC. I use coco coir as a soil. Light, humidity and other conditions are normal. I've been running the Lucas formula. 5 days ago pH fluctuations had been observed (droping up to 4,5 per night), and then I changed the nute solution and the pH has stabilized. I also added peroxide.

    Yellow spots with clear boundaries appeared on lower leaves and are spreading on middle-aged leaves.  What could be the reason for this?
    All leaves have a normal color (not pale, no chlorosis or other sickness).
     
    [​IMG]
     
  2. #2 sbad0420, Oct 31, 2013
    bugs?

    DHM

     
  3. #3 parkuser, Oct 31, 2013
    Excuse me, what is DHM?
     
    Can i discern the bugs with the naked eye?
     
  4. #4 fenabar, Oct 31, 2013
    I'm the wrong guy to ask. I'm not a good grower, though I build nice grow rooms :)
     
  5. #5 GrowBot, Oct 31, 2013
    is it just the one leaf, or all over?  that has the look of a concentration of thrips.  check the bacl of your leaves for a mass od "very small," bugs.  also, are you dwc, or in coco???
     
  6. #6 parkuser, Oct 31, 2013
    There are about five affected middle-aged leaves like this
     
  7. #7 parkuser, Oct 31, 2013
    Last edited by a moderator: Oct 31, 2013
     
    I did not find any bugs. Growing in DWC with coco in net pots (in place of vermiculite)
     
  8. #8 GrowBot, Oct 31, 2013
    interesting, any pics?  i'd like to see that
     
  9. #9 sbad0420, Dec 12, 2013
    [quote name="parkuser" post="18912253" timestamp="1383233195"]Excuse me, what is DHM?Can i discern the bugs with the naked eye?[/quote] My initials DHM
     
  10. #10 Reptarmybowl, Nov 15, 2016
    I have extremely similar yellow spots. Did you ever figure out what caused this? Is it something to worry about?
     

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