Small brown and black spot

LOL.

... dude you're over analysing things.

210 watt perpetual box
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If those are the only signs of it then I wouldn't worry. But I don't know what it is. I have never had it myself. I'm guessing a fungus. What is your humidity? Do you have a fan blowing on the plant?


I would keep an eye on it to see if it gets worse, and if it does then I'd amputate that leaf. If it doesn't get worse, then I'd ignore it

 

Being paranoid isn't always a bad thing, it's good to spot things early

 

it doesn't matter what time of day. Sorry I can't offer much advice on this one, I have never seen this before

 

Did you maybe get some water on the leaf , although its not really looking like a burned leaf

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Lol at amputate... cutting off one leaf doesn't solve the problem ( if there even is one). Looks like a water drop or 2 got on the leaf and that is what caused it.

 

There is no problem that I can see. Looks like the tip of that little leaf might have a touch of burn on it, but that's nothing unusual for a plant that size. Look....these are weeds and aren't nearly as delicate at most people believe when first starting out. No nutes, pH'd water only until this plant gets MUCH older....like a few weeks down the road after it's had time to use up the nutes that are in the soil fresh from the bag. Let it dry out between waterings...and I do mean DRY OUT! These things don't like moist conditions around the roots and need to dry out between watering/feeds. Keep the pH right, give them good grow medium and environment and make sure your water/feeds are pH'd to proper range and your plant will be pretty healthy overall. TWW

 

There is a fungus called black spot that looks just like that. I have never known it on marijuana, but I have never seen this before either, and I have been growing for over 20 years. If it was fungus and began to spread over the leaf it would definitely be worth removing it so it doesn't spread to the rest of the plant. So it could solve the problem and if the leaf if going to be consumed by fungus anyway, you may as well get rid of it

 

He's referring to the black spots. A wanted plant by definition cannot be a weed.

 

if he is growing in an environment that can facilitate black spot fungus then he has a bigger problems besides cutting a leaf or 2 off. That's not gonna stop the black spot from coming back. Sure it might slow it down for the time being. But yea.. if you have black fungus on your plants you need a better solution than taking a leaf or 2.

 

Now that im looking at it... it looks like powdery mildew damage.

Never seen it in person so I can't judge

210 watt perpetual box
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Well yes of course, that's why I enquired about the environment, but it's still worth cutting off the infected parts if it's simple as just a leaf