Brown and white spots on some leaves

[unattendedbag]

Hi everybody,
A few days ago brown spots appeared near the edges of the leaves (but not limited to them) of my trainwreck autoflower. They don’t appear on every leaf, just a few. I also noticed some white specks on one or two leaves. I also saw that one leaf has a curled end. Anyone know what this is?
Also it’s 3,5 weeks old... is its size normal?

 

[Obi-Wan]

A couple of pics look like you might have a pest of some sort and 1 in particular(showing burn around the leaf edges) looks like your soil is a bit too hot. The plants look good otherwise so I wouldn’t worry about the burnt edges, they’ll grow out of it. I would treat them with neem oil or something equivalent to rid them of the pests.

 

[unattendedbag]

Thanks Obi-Wan!
How and how much should I apply to the plant? (I’m new to growing as you may be able to tell lol)

 

[Obi-Wan]

Neem oil is generally applied by foliar spray but some growers will water some into the soil for good measure. I’d start with 25% of what’s recommended on the label to start, your girls are young and you don’t want to over do it.