Que tipo de plaga es?

Sure is... I've tried to combat them with Neem oil with little success on other plants... and diatomaceous earth probably won't help as you can't really get that stuff onto the leaves where these pests are (it's really only good on creepy crawlies that crawl around on the soil or the floor of your tent)... Don't know about potassium soap. What I've learned from others is that Spinosad, which is organic as well, will work quite well but haven't had the chance to use it - thankfully! Good luck!

U are right: spider mites