Hmmm . . . I have some of those in the garage for other pests. I wonder if this would work in the greenhouse?

Are there any research studies showing these devices are effective in insect control on plants (you'd think the manufacturer would be promoting it like mad for this purpose if that were the case)?

mcrean: I don't see why they wouldn't work in a greenhouse. As you probably know, a larger space would require more devices.

Eric: Studies have been done re ridding spiders and flies from homes. I don't know of any regarding plants; I haven't researched it. But I figured that spider mites are arachnids not mites---and if it worked on spiders, there was a good chance it would work on spider "mites". The disappearance of my white flies was just a big added bonus. I do have yellow sticky traps all around my basement planting areas, which would probably throw off any claim to mine being a scientific experiment (although, now, there doesn't seem to be any thing for them to trap).

Thanks, Tom. That makes me feel less crazy. The devices do seem to work; I put in new yellow sticky traps and in 3 weeks have collected nothing. Gone. It's reasonable that people--like Eric--would wonder why the manufacturers don't promote them for indoor plant and greenhouse use. Maybe they just tested each species separately rather than in the whole real life interconnected world of insects and arachnids. But hey, it works for me..and now you.

Electronic pest repellers are a joke. If they worked they would need EPA apporval and an EPA number. I bet they repell pink elephants also.

Lynxville: No need to get fractious. Hey, they're only 19 bucks. What did I have to lose? If there's a joke in any of this, it well may be on those closed minds unwilling to experiment.

Why would they need EPA approval? My MP3 player makes noises and it doesn't need EPA approval.

Noise emmissions are governed by the FCC, not the EPA. AFAIK.

Sam

@mysteryrose ,

I know this is an ancient post . Just checking in to see if you’re still having good luck with the repellers . I’m willing to give them a shot . Can you provide a link to the ones you have ? Thank you 😊

shrubs_n_bulbs. Everything that makes a repellent claim requires EPA Approval. Just research Eucalyptus Oil. That's how they make mucho bucks!