how to solve this problem?

Salut, je te conseille SMC spider mite control de Growth technology, un produit 100% organique et efficace.

to kill spider mites The most effective predator in the right conditions is: Phytoseiulus persimilis, supplied in shaker bottles or vials. It breeds quickly in the crop with faster egg laying than the spider mites and starts feeding soon after application. It eats spider mite faster than all the other available predators and will happily go into dense webbing to feed, which some of the others will not. However it does not survive long without food and cannot be introduced before spider mites are present. They also need temperatures to be above 15C to be active and are most active from 20C-30C,temperatures above this will reduce and stop their activity. Introduce after spider mite is observed and apply them close or onto the infected areas of the plant. In high infestations repeated applications may be required to build up their numbers to a level where they out compete and control the spider mite.

you could use predators of these insects, online they are easy to find for biological control

Thanks! I'll try

Clean both sides of leaves with potassium soap. You can buy it as solution to mix with alcohol and water or just prepared to use it. I hope you can solve your plague. Wish you the best.

I would shoot that with some Safers 3-1 garden spray. It’s not organic but in moderation it does really well. And sprinkle a little diotamacious earth on top of your soil to prevent bugs from mucking around in the root system. It acts like barbed wire for bugs. That’s my two cents. I’m sure other growers have a different technique to tackle this problem. Good luck with the fight.