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    Dominick DeVarti
    Mar 12, 2019

    Powdery Mildew?

    in Grow Community

    The leaf on the right side

    These spots started showing up on the leaves of my seedlings a day ago. I can’t tell if it’s a type of nute burn or if it is mildew. My humidity levels were extremely high but I lowered them and sprayed water with hydrogen peroxide and baking soda on the leaves today just in case if it is. Any thoughts?

    12 comments
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    Mr. Grow It
    Mar 12, 2019

    Hmmm... A little hard for me to tell by looking at the picture. I definitely don't see nute burn. How is the air circulation in your grow space? I like 70%+ humidity for seedlings but I always make sure a fan is in the grow space moving the air around. Stagnant air greatly increases the chances of powdery mildew occurring.

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    Dominick DeVarti
    Mar 13, 2019

    My humidity has been at about 80-95 because of the dome. I took rockwool cubes and proped it open to lower humidity. I have no air circulation in my grow space at the moment but I will when they are transplanted into my 4x4 tent. Currently they are just in a seedling propagation tray coming up on week 2 after germination. The spots on the leaves kind of look like a brownish tan color to the naked eye and some spots are a little bit lighter colored.

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    Dominick DeVarti
    Mar 13, 2019

    This picture may be better. It started off as a lighter color, almost a light green and then got darker.

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    Mr. Grow It
    Mar 13, 2019

    Ok, so not powdery mildew. That's good. When do you plant to put in the 4x4 tent and what's the humidity like in there? I personally only keep a dome on until a small root structure has been established. The plant has leaves then and will need fresh air (specifically CO2). What brand soil is that and have you fed it any nutrients?

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    Dominick DeVarti
    Mar 13, 2019

    The humidity is about 30-40% but I have a humidifier to help me control it it’s just turned off right now since the tent isn’t running currently. I’m using coco not soil and I have fed it blue planet nutrients easy weed, botanicare’s silica blast, and rhizo blast. I know that these are mainly made up of nitrogen and not much else. I fed a small amount of nutes but at a fairly high ppm since Im using tap water. My pH is about 5.5-6. Since it’s coming up on week 2 I feel like I need to increase nutrients so I really need to figure this out. I was thinking it could possibly be a phosphorous, magnesium, or calcium deficiency?