Hmmm. A lot easier, I suppose, than filling the house with phosphine or formaldehyde, which are standard fumigation gases. But I'd much rather do this in a greenhouse that I didn't have to spend time in than in a house that I lived in. I suspect what's going to kill spores isn't going to do your lungs a lot of good. You do understand that ozone generators are never really supposed to be used in occupied spaces. Ozone is highly reactive, and will damage building materials, carpeting and furniture as well as kill stuff.

Even if you killed off the powdery mildew spores in your house, if those spores are outside, you'd be hard pressed to keep them out there. There are various sprays you can use on your plants, including pretty innocuous ones. I'd be inclined to treat the plants rather than the house.

If you're getting your "precautions" from the manufacturer of the ozone generator, I'd be very suspicious. I think the EPA has a page on ozone generators that are sold as air cleaners, and it isn't very reassuring.

I have a pretty strong generator - not air cleaner. When my dog had ringworm, we used it every week following way: spray as much surfaces with water, to make it dump, then close all the windows, remove all alive creatures from the room (including plants and seeds), then turn it on for 30 min, close the door and go to have a walk for an hour. Come back, hold your breath, go in and open all the windows. Go for another hour walk. Then come back and continue living). It was a pretty annoying routine for 2 months, but so far - I can say it worked. The dog got well and ringworm didn't come back for about 3 years now(that what all people say is the worst part - it goes away under treatment and returns few month later from the spores left in the house and put your pet back on the poisonous pills), so I guess it killed all the spores. Said that I think I can survive one treatment for powdery mildew. I am not sure if I should or not, as I have the same concerns, that spores will come back next spring on my dog's hair, from the open window and so on... Also there is a difference between ringworm spores and powdery mildew spores - ringworm spores die on direct sunlight, if exposed for long time, I guess this doesn't happen with powdery mildew, otherwise we wouldn't have such problem with it... So I am still thinking...

OK, so you're basically talking about doing fumigation with ozone. That sounds safe, though still may result in some damage to the house. It's true that although ringworm in dogs is easily treated in the dog, it takes a lot of hygiene to kill the fungus in your house in order to avoid repeated infections. But yes, if the PM spores are in the local environment, they'll get back in your house and replace the ones you might have killed. It's kind of amazing how much houses "breathe".

I think it is true that there are no pepper cultivars yet that are resistant to PM. So maybe the best bet is just to manage the humidity in the growing area better, and perhaps use some fungicides. Finely powdered sulfur is supposed to work.

Your proposal is overkill.

Powdery mildew spores are airborne. If you actually could be successful in clearing them out of the hose, they would return the minute you open the door.

All you need do is to follow good growing practices which include using tolerant varieties and planting with good air circulation in the growing site, be the latter indoors, greenhouse, or outdoors.

Changing varieties is out of question - I selected the ones I like by many other parameters. For the growing practice - I try my best, but it is not always possible due to the space and short season constrains.

I don't think there are any mildew tolerant varieties of peppers. There are for peas.

what "short season constrains " do you have in zone 5b? I am in that zone and my season is from late March to early November, longer with season extension methods

So when do you start picking your peppers - in March?) I don't think so. I start my peppers in late Feb- early March, to start picking at the end of June. I pick them till first frost in October. Keeping in mind I only have 6000 sq foot yard, that also includes house, 2 sheds, 8 dwarf trees, few berry bushes and other veggies I can't plant more then 30 peppers. And I need about 10 5-gallon buckets to be picked by the end of the season for my canning/freezing needs. This is why I start them early, and plant them out in late May with almost every plant having several peppers on it. But that comes with the cost - when I start them, they have all the room and air they need. By the end of the "in house" period, it is jungles there. If weather is not cooperative to move them out to portable greenhouse I set on the deck(only unused space in my yard) like this year - we struggle. But anyway, it worse it, as they start producing much earlier and give me more for the season. Actually, even powdery mildew doesn't set them back much. So short season in zone 5 is comparing to warmer zones, where you can start your plant a month before transplanting without worrying about PM in crowded environment and still get good crop for the season.

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