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Brown / rust spots on leafs - anybody able to diagnose?

Discussion in 'Sick Plants and Problems' started by Tinytimspencer49, Dec 27, 2021.

  1. #1 Tinytimspencer49, Dec 27, 2021
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  2. #2 countrytoker34, Dec 27, 2021
    What's your light wattage and at what height is it hanging?

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  3. #3 Tinytimspencer49, Dec 27, 2021
    Last edited: Dec 27, 2021

    3 600W LED lights, started with 2 cheap 600W LED lights but added the 3rd as felt like they weren’t getting enough coverage. They are now hanging at about 26inch away. Currently there are 3 affected plants out of 13, the 3 affected being some of the smallest amongst all of them which is why I don’t think it could be a light problem but I may be wrong?
     
  4. #4 Tinytimspencer49, Dec 27, 2021
    Currently they’re on a 24 hour light cycle - all autos
     
  5. #5 Tinytimspencer49, Dec 27, 2021
    I did spray some biobizz leaf spray just this week on the plants to try help the leafs as some of them were beginning to canoe which I believed to be from the fluctuating temperature at night time (temp stays between 19-25 Celsius) however I kept the lights on continuously still after the spray, I thought that may be the problem but again I sprayed all of the plants and only 3 are affected
     
  6. #6 countrytoker34, Dec 27, 2021
    My friend even autoflowers needs time for root growth, I say your burning them with light and not allowing for rest. My ladies on 18/6 doing perfectly amazing under a 500 watts led!!
    These are 2 separate ladies
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    [​IMG][​IMG]
     
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  7. #7 Tinytimspencer49, Dec 27, 2021
    I had considered this but I read that autos would be fine with constant light and because the 3 affected are the furthest away from the light I ruled it out, but Thankyou for your advice I will try switch to 18/6 and hope the problem doesn’t continue
     
  8. #8 Tinytimspencer49, Dec 27, 2021
    What do you have growing at the bottom of your pot?
     
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  9. #9 countrytoker34, Dec 27, 2021
    We call it chicken weed it's proper name is
    Stellaria media (L.) Vill.
    It grows wild here in my parts and it makes a good cover crop in my pots.

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  10. #10 Clearsky, Dec 27, 2021
    Some people do grow with 24 hours of light probably with good success, but I feel plants need a rest so that's how I grow give 8 to 6 hours of darkness. As far as the rust spots on leaves it can be so many different things that cause them, good luck with your grow and just learn from it for the next one.
     
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  11. #11 Green Dragging, Dec 27, 2021
    I'd spray then shut lights off.
    Do you have any bugs under leafs?
    2nd pic has some granular substance on leaf?
     
  12. #12 Tinytimspencer49, Dec 28, 2021
    The substance on the leafs are a mix of diatomaceous earth and worm castings that have flicked up from the waterings
     
  13. #13 SofaKingHigh_, Dec 28, 2021
    What are you growing in? Looks like a cal mag issue but also could be from 24 hour light.
     
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  14. #14 Tinytimspencer49, Dec 28, 2021
    What medium am I growing in or tent? Medium is mostly biobizz all mix, biobizz light mix, bit of perlite, worm castings and a bit of diatomaceous earth on top, some clay balls at the bottom of the pot too (fabric pots) - tent is a 3x7ft
     
  15. #15 mactheman, Dec 28, 2021
    think i agree with @SofaKingHigh_ could be cal/mag issue ,,,,mac,,
     
  16. #16 JMcGD, Dec 28, 2021
    It could also be burn from the foliar application. Sometimes I’ll get that on a plant or two and think “ Calcium!”
    Then I think back and find that those plants that were affected were the last to get sprayed on the last round of foliar feed or IPM. Those sprayers tend to sputter at the end as they run out of solution, and if you didn’t emulsify or dissolve all of you inputs 100% then that last little bit can be super hot and burn leaf tissue.
    In my case it was easy to diagnose because it literally showed up overnight. New growth was unaffected.
     
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  17. #17 PotStrainsForBackPains, Dec 31, 2021
    Bump up the calmag.
     
  18. #18 Tinytimspencer49, Jan 2, 2022
    Thanks for all of your help and advice I appreciate it, they’re now on a 18/6 schedule and I haven’t sprayed the leafs since, didn’t add any extra calmag since the hydroponic shop local to me has been shut but clearly it wasn’t the issue, all plants are now looking really healthy with the exception of 1 that has a bit of a clawing leaf problem ‍♂️ Trying to remedy it hopefully within a couple days will stop clawing down.
     

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