CH9 Green Bud Fem Grow

Whats up my fellow ganja buddies? Ok guys this is my first grow and i came across an issue =( my plant is 3 wks old and its starting to show yellow/brownish spots and im thinkin it might be insects eating my roots but i really dnt know. And it is ch9 green bud. I cnt post up pics right now because im on my phone.but i will asap. Hit me up guys i need sum help dnt wanna hurt my har est.
 
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