Yellowing and brown spots on new growth tips

Discussion in 'Sick Plants and Problems' started by seedstodreams, Jun 14, 2020.

  1. #1 seedstodreams, Jun 14, 2020
    Last edited: Jun 14, 2020
    Day 33 Chemdoggin x CDLC autoflower by Mephisto
    50/50 coco/perlite mix
    Canna A & B with CalMag
    5.8 - 6.2 pH tap water
    850ppm for last 2 weeks
    4x4 tent, 4x QB96 v2 with canopy getting around 50-60k lux
    Started feeding 5ml/gal CalMag with my A & B around 2-3 weeks ago, this problem just popped up over the last few days

    Lower growth looks fine and it's not all over the plant. I'm thinking maybe too much light? The other chemdoggin x cdlc next to her that's a few inches shorter doesn't have this problem and their being fed from same reservoir

    Sorry for the pics, the lights are so bright and make it seem more yellow than it is

    IMG_20200614_094746544.jpg IMG_20200614_095052548.jpg IMG_20200614_094637083.jpg IMG_20200614_094619841~2.jpg
     
  2. I'm thinking it's too much Phosphorus, which can take up to a few weeks to show

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