I noticed some white aphids on the dirt around the plant: a quick Google search showed they're probably root aphids. Could it be the reason of nutrient deficiency? Are there any hemp-specific remedies you could recommend?
Yo veo virus mosaico.
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Yeah! looks like mosaic virus to me too!
I've never once seen a confirmed case of Mosaic Virus in cannabis, yet it's the first thing everyone jumps to in threads like this.