Hi @gavenPh! Spider mites hate humidity/water, neem oil, crushed garlic, soap... You need to treat asap before it spreads. More than a single treatment, you need a pest-prevention-strategy as soon as you plant your seedlings. My strategy is pretty simple and consists in 3 methods: 1) I have an electric atomizer working 10min every hour to diffuse essential oils mixed with fresh water (a few drops of lemongrass, lavender, peppermint...you can find those oils in nature-stores or online). Those oils are repelling insects/pests, they don't like the smell of my room. 2) I spray neem-oil once a week when the light turns off, 10-12 drops of pure neem-oil mixed in a liter of temperated water, this oil is really efficient to kill/disturb/sterilize the invaders. 3) I sometimes use a dedicated foliar spray (BioBizz LeafCoat) in order to create a 'transparent layer' onto the leaves and to protect them from spiders/thrips/moths/miners... In your situation I would spray a solution made of water + neem oil + crushed garlic, at night, onto and below the leaves. Do this at least once a week until the flowering stage. I hope this will help you to get rid of these mites, keep us updated and happy growing 👊
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