It might be worth to swap around those trays in the spring, clean them up with soapy water and let them sit in the sun.
https://extension.oregonstate.edu/gardening/techniques/how-recognize-manage-spider-mites-home-garden
It might be worth to swap around those trays in the spring, clean them up with soapy water and let them sit in the sun.
https://extension.oregonstate.edu/gardening/techniques/how-recognize-manage-spider-mites-home-garden