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Thread: Brown spots on Sativa strains.

  1. #1

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    Default Brown spots on Sativa strains.

    Hello friends

    I started a grow outside in July and grew them from seedlings right into week one of Veg. so 26 days in total (outside) prior to bringing them indoor. I did some proactive IPM, at a reduced rate as I didn't have visible issues other than gnats.

    They were big from the sun exposure, the largest germination and seedlings I've ever grown, currently in grow six.

    Fast forward to today, I have been doing lite feeds using RO water, Silica, CalMag, Kelp, Great White, Recharge, and Liquid Karma.

    I feed every 3 to 4 days 1 liter of the above sometimes a tad bit more.

    Last night, I noticed brownish spots on some leaves across a few plants of different strains - Durban Poison, Sour Tangie and Super Lemon Haze. I'm so bummed, because ppm has been under 1.0 and pH 6.3. With most of the feed being "organic" or microbe based.

    I'm doing a Silica & CalMag, pH6. 3 with Recharge (microbes). Hoping this lesser nutrient more water helps.
    Here are some pictures.
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    Thanks for checking in, any suggestions are appreciated.

    Thanks!

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  3. #2

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    Quote Originally Posted by ToughCall View Post
    Hello friends

    I started a grow outside in July and grew them from seedlings right into week one of Veg. so 26 days in total (outside) prior to bringing them indoor. I did some proactive IPM, at a reduced rate as I didn't have visible issues other than gnats.

    They were big from the sun exposure, the largest germination and seedlings I've ever grown, currently in grow six.

    Fast forward to today, I have been doing lite feeds using RO water, Silica, CalMag, Kelp, Great White, Recharge, and Liquid Karma.

    I feed every 3 to 4 days 1 liter of the above sometimes a tad bit more.

    Last night, I noticed brownish spots on some leaves across a few plants of different strains - Durban Poison, Sour Tangie and Super Lemon Haze. I'm so bummed, because ppm has been under 1.0 and pH 6.3. With most of the feed being "organic" or microbe based.

    I'm doing a Silica & CalMag, pH6. 3 with Recharge (microbes). Hoping this lesser nutrient more water helps.
    Here are some pictures.
    Click image for larger version. 

Name:	20220919_220204_resize_1.jpg 
Views:	19 
Size:	1.15 MB 
ID:	429674
    Click image for larger version. 

Name:	20220919_220153_resize_22.jpg 
Views:	20 
Size:	1.29 MB 
ID:	429675
    Click image for larger version. 

Name:	20220919_220143_resize_40.jpg 
Views:	21 
Size:	1.35 MB 
ID:	429676
    Click image for larger version. 

Name:	20220919_220125_resize_82.jpg 
Views:	21 
Size:	1.65 MB 
ID:	429677
    Click image for larger version. 

Name:	20220919_220252_resize_29.jpg 
Views:	22 
Size:	992.9 KB 
ID:	429678
    Click image for larger version. 

Name:	20220919_220231_resize_58.jpg 
Views:	18 
Size:	1.24 MB 
ID:	429679

    Thanks for checking in, any suggestions are appreciated.

    Thanks!
    I would run some plain RO water through. Let it sit in runoff for about 10 minutes and then check the runoff ec and PH.

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  5. #3

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    Thanks CityDweller, that is sound advice and will be doing just that.

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  7. #4

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    Quote Originally Posted by CityDweller View Post
    check the runoff ec and PH.
    PH low & EC high would be my guess....
    It's Not What You Know, It's What You Can Prove

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  9. #5

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    Quote Originally Posted by M_C View Post
    PH low & EC high would be my guess....
    Exactly what I was thinking. Salt buildup gonna need a nice flush.

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  11. #6

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    That second pic reminds me of my plants when I start them and they are getting too much light.
    Also, you say you started them outside, then brought them inside. Did you bring any bugs in with them?

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  13. #7

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    When I see super dark leaves, that have never wanted for nutrition, and also spots, I always think something is locked out due to the excess of another nutrient.

    I'd have to agree with resetting the media via flush.

    Cheers
    B


    "The footsteps of the farmer is the best fertilizer."

    Welcome to The Barnyard

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  15. #8

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    Hi Toughcall, have you sprayed anything on them lately?

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