two spotted spider mites are about 1/100 - 2/100" wide, so a 250 micron screen should keep them out. maybe go to 150 micron to keep younguns and mutants out. but i have to say - they go dormant during winter outside. youre fighting multiple generations of survivors that you brought in earler this year and the longer you fight them, the tougher they will get.
hot shot no-pest strips work. poisonous, yes. effective, hell yes. took mine out after one month and there are 0 signs of mites.
hot shot no-pest strips work. poisonous, yes. effective, hell yes. took mine out after one month and there are 0 signs of mites.