First grow... white spots on leaf margins

T

ThailandBound

Member
Wondering if this might be a result of over fertilizing as it looks like mineral deposits or something similar. These appeared one day after watering and fertilizing (using Mega Crop), first presenting themselves as a little droplet of water. After the water dried, the deposit was left. I'm watering with rain water so it is pretty pure in terms of minerals/salts. No burning on leaf tips or other discoloring, and the plants themselves appear to be healthy.

Just wondering whether or not I should cut back (fertilizing every 4 days when I water) or not. I was told that Mega Crop is a constant feed fertilizer, so that is why I fertilize every time I water. Might not need to do so, I really don't know.
 

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Helltownhero

Helltownhero

Well-Known Member
ThailandBound said:
Wondering if this might be a result of over fertilizing as it looks like mineral deposits or something similar. These appeared one day after watering and fertilizing (using Mega Crop), first presenting themselves as a little droplet of water. After the water dried, the deposit was left. I'm watering with rain water so it is pretty pure in terms of minerals/salts. No burning on leaf tips or other discoloring, and the plants themselves appear to be healthy.

Just wondering whether or not I should cut back (fertilizing every 4 days when I water) or not. I was told that Mega Crop is a constant feed fertilizer, so that is why I fertilize every time I water. Might not need to do so, I really don't know.
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That my friend looks like powdery mildew...from what im told that crop is a goner...im pretty new i could be wrong...lets see what the other guys think..but im almost 100% on that
 
Therrion

Therrion

Well-Known Member
I second Helltownhero's opinion, however you can use fungicide or an organic solution to get rid of it. Just look online, there's many options. It doesn't look like a fertilizing issue. Rainy season? Is it very humid where you live?
 
Helltownhero

Helltownhero

Well-Known Member
Therrion said:
I second Helltownhero's opinion, however you can use fungicide or an organic solution to get rid of it. Just look online, there's many options. It doesn't look like a fertilizing issue. Rainy season? Is it very humid where you live?
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So there is treatments for it? I thought your crop was fucked once u got it...or is it just really really hard to get rid of?
 
T

ThailandBound

Member
trichcrazy said:
did you get alot of water on the plant when watering ?
it looks like excess fert to me.pm looks more like flour on your plant not spots.
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I am familiar with powdery mildew, and this is not it. This stuff is a dry substance that is left after water droplets disappear, only at the tips of the leaf serrations. Here is a picture taken this morning (I watered and fertilized yesterday) which shows what it looks like. The above pics in the OP are after a couple rounds of watering and fertilizing. In this picture, this is how it starts out. I've got 30 plants, all get the same amount of fertilizer, the same amount of water, all are clones, only two plants have these spots this bad, and maybe three others have a few leaves with these spots... which all form the same way (from a liquid exudate... I'm thinking excess fert). After that water dries, the whitish deposits remain.

I'm just trying to get a handle as to whether I'm watering too much or fertilizing too much. There is no fertilizer burn and the plants are all thriving.
 

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T

ThailandBound

Member
Helltownhero said:
That my friend looks like powdery mildew...from what im told that crop is a goner...im pretty new i could be wrong...lets see what the other guys think..but im almost 100% on that
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I'm thinking not, but we will see. I posted a pic above this post as to how it starts... with clear water being exuded from the edges of the leaf serrations. This is the only place the white powder is (the white stuff is left behind after the water evaporates), nowhere else on the leaf... only the edges. Thanks for the reply... I'm still learning as this is my first grow.
 
T

ThailandBound

Member
Therrion said:
I second Helltownhero's opinion, however you can use fungicide or an organic solution to get rid of it. Just look online, there's many options. It doesn't look like a fertilizing issue. Rainy season? Is it very humid where you live?
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Yes, it is very moist (humid) where I am (Puna, Hawaii). I'm thinking it may be that the plants are just sucking up too much water and expelling the rest along with the nutrients. I don't think it is a disease of any sort as the plants are thriving, green, and happy, they are heading into the fist week of the flowering cycle. I will definitely be keeping an eye out for mildew though, as mold over here can be a serious issue. Thanks for the reply!
 
T

ThailandBound

Member
The Gram Reaper said:
I don't believe that is powdery mildew, it looks like excessive humidity/water with the sun/light bleaching spots that the water sat on.
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Yes, and the plants that get this are both at the front of the greenhouse (open ended greenhouse), and both get direct afternoon sun for 2-3 hours, the plants in the middle and back all lack these spots, and lack the water droplets too.
 
The Gram Reaper

The Gram Reaper

Well-Known Member
I am not familiar with outdoor greenhouse cultivation. I would say greatly increase airflow as soon as you can. Not sure how to remove humidity outdoors other than increased air flow, unless the greenhouse has climate control like air conditioners and dehumidifiers.
 
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