They may not be organic but are used in the food industry and when used correctly are effective and "safe"(apples to apples with forbid, avid IMHO). You close up the room for 3 days, (no air in or out). After that I dispose of the strip and bust one out in about a month. It's all about prevention. My garden has been clean as a whistle for the past 6-7 months here, since I got rid of the recurring root aphids. @ bowlful--you are right, you can't just stick a strip in there. where alot of new guys go wrong and the strips are ineffective. also I've seen people use them and not seal the room. not gonna work. gotta treat, clean, attack them from multiple angles. I guarantee that it will AT LEAST increase your chances of ridding a regular mite infestation.