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Thread: Discoloration on leaves - Doctor needed? : )

  1. #1

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    Default Discoloration on leaves - Doctor needed? : )

    Hi everyone!

    I´m new here and would really appreciate some help. I started growing these autoflowering plants about 2 weeks ago. I initially soaked the substrate, but not a lot. Then I put the germinated seed in and watered a little after 1 week. After another week (yesterday) I soaked them in a lot of water so there was a little run off.

    There is some discoloration which started yesterday and has become more pronounced. Is there something wrong with them? I am guessing either too much water, some kind of fungas, or lack of nutrients (I haven´t added any nutrients yet and believe the substrate is quite nutrient light).

    Thank you for your help!

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    Mark

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    What medium is that they in? Coco or soil?

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    They are in quite a light substrate.
    Coco 30%
    Pressd peat 25%
    Turba Rubia 45%
    EC 0.3
    PH 6.2

    Here is a photo of the soil - It´s all in Spanish though:
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    Oh by the way, thee seeds were Royal Haze Automatic, and Northern Lights Automatic

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    A had hoped it was like 100% coco lol. Cause a had markings similar to that when my ph pen was out of whack lol.
    Not so sure about this spanish stuff. Sorry.

    But autos that size, wont need as much water as your last watering. A would add some food to your water for next time too. Plants do look a tad hungry. Just go easy with the watering. Dont have the little roots constantly sitting in water. Let them breath n get em to search the pot

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    Thank you man, I will go easy on the water and add a little food at the next watering.

    I read that you should put your finger in the earth and if it is dry for a few inches, then soak it completely. Then let it dry completely. Would you say that is correct for Autos too?

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    I see the pH of your growing medium is 6.2, that's good because peat can be all over the place in pH. so the big question I have for you are you measuring the pH of your nutrients when you put them in?

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    Quote Originally Posted by jingo View Post
    I see the pH of your growing medium is 6.2, that's good because peat can be all over the place in pH. so the big question I have for you are you measuring the pH of your nutrients when you put them in?
    Hi Jingo,

    I am not measuring the pH. However I will buy a PH meter to check. So the idea is to check the pH of the solution before putting it in the soil, or adding the nutrients and then checking the soil pH?

    I guess the fact that I am watering with tap water could also affect hings as the calcium content in Spain is quite high.
    I have not actually added any nutrients yet but will do at the next watering.

    Thanks

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    Quote Originally Posted by marky4marx View Post
    Hi Jingo,

    I am not measuring the pH. However I will buy a PH meter to check. So the idea is to check the pH of the solution before putting it in the soil, or adding the nutrients and then checking the soil pH?

    I guess the fact that I am watering with tap water could also affect hings as the calcium content in Spain is quite high.
    I have not actually added any nutrients yet but will do at the next watering.

    Thanks
    Absolutely, that may be your number one problem. Peat and Coco are both mostly inert, so you have to feed and you have to keep your Ph in an acceptable range for cannabis. I prefer a pH range of 5.8 to 6.3 in coco and I think if you stick around those readings you'll probably be just fine although you could go a little lower because the pH of your medium is already 6.2.

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    PS: run off of about 10 to 20% every time you water is critical when you're feeding and inert medium you don't want any of your nutrients to build up in your medium over time.

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    and now that I think of it, you need to make sure your plants don't reabsorb any of that runoff so they can't be sitting down in trays while you're watering you have to elevate them above your trays or come up with some other system. If you got room you can just put them in the bathtub or something like that.

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    Hi everyone,

    There have been some developments and I think the problem is getting worse. They are now in week 4 and as you can see those white patches are still there. The white discoloration seems to be more evident in the bottom leaves. Also I have just noticed that a couple of the bottom leaves have some dark spots (see the first picture).

    I gave the first feeding (1/2 recommended amount of fertilizer for growth) about 1 week ago.
    I also noticed that the PH of the runoff was too high, (around 7-7.5 (can´t tell exactly as the PH tool I bought is analogue - I´ve ordered a digital one).
    Yesterday I watered with PH around 6 to try to rebalance the levels. I gave more water than before, and immediately after watering the leaves drooped. However this morning they are no longer drooping and look find apart from the white patches and those dark spots taht are starting to appear on the bottom leaves.

    Is it simply that the PH has been too high? Any suggestions would be very much appreciated.

    Thanks!

    Mark

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    Those bigger white patches just look like some sunburn I never seen that bright white of a color but the pattern is definitely one of something shining on the leaf with another spot being blocked or shaded. Those other leaves are getting chewed on by probably aphids or something, it's hard to say if it becomes an issue insecticide with pyrethrin would be good.



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    Thanks Jingo, I did see a couple of jumpy insects, but they only just arrived 2 days ago, already been spraying them with some neem oil mixed in a potassium soap solution.

    Are you sure the bright patches are sunburn though? Firstly, the lower leaves seem to be the most affected and they get less sun. Secondly they only get about 5.5-6 hours of direct sunlight per day.

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    Quote Originally Posted by marky4marx View Post
    Thanks Jingo, I did see a couple of jumpy insects, but they only just arrived 2 days ago, already been spraying them with some neem oil mixed in a potassium soap solution.

    Are you sure the bright patches are sunburn though? Firstly, the lower leaves seem to be the most affected and they get less sun. Secondly they only get about 5.5-6 hours of direct sunlight per day.
    No I'm not sure mate, that's kind of an odd pattern. But you're probably watering down lower and if you get a little bit of water on your leaves they'll magnify any kind of light you've got. I've seen sun damage burn right through a leaf before. But I'm really not sure?



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