Looks like aphids to me as well. To upload multiple photos in a single post you first need to upload them to a third party site such as photobucket. Then you copy and paste the HTML link from there to here. Rodney

Your soil around these plants is full of spores ready to infect new growth. Cut off all the mildew, in your case it sounds like all the above ground plant. Treat it like the disease it is and put it in your garbage, out of the garden. I would apply a good fungicide to the soil. I like the Bordeaux mix which is long lasting, in an attempt to prevent a reinfecting next year. Your plants will return with strength next year from the roots. While I am not gardening in your climate, I doubt you would need to cover your peonies for winter protection. Al

Appears you're correct. Treatments for powdery mildew must be applied at the first hint of disease. Harvest the pink tomato and let it ripen on the counter. Then open up that area as much as possible to increase air circulation. Water at ground level. Remove the brown portions of the leaves because thy won't ever re-green and, right now, they are limiting air circulation within the plant.

I'm trying to wrap my mind in tightly sealed plastic so the disease organisms don't escape... or is it to prevent contamination? A conventional farmer who tightly seals diseased plant debris in plastic is not much of a farmer. I know a few farmers...did I say a few? They would till the plant debris in (some would use a prescribed burn, depending on situations), and use crop rotation...for instance, if you grow potatoes, you don't grow potatoes on the same field year after year. You grow potatoes on any given field one year in five, or even more. In the other years of the rotation, you grow wheat, corn, alfalfa...crops that are not affected by the same diseases that bother potatoes. Sanitation, resistance, and crop rotation. Conventional or organic may not be as far different as some would have you believe. I'll repeat my statement. The first thing you learn about organic growing is sanitation. The second thing you learn is sanitation. The third thing you learn is how many pesticides are used. In the part of the world where I currently live, the organic growers do mare spraying than the non-organic growers. The next thing you learn is that people tend to think that they are the only ones who know how to grow organic, because everyone else is brainwashed by (insert mind controlling organization here. I prefer the Spectre of Ian Fleming's works, because that make me a horticultural Bond, James Bond). If you are the only one who knows what organic growing is, then the rest of the world can only be wrong. I find that position to be...untenable? about compost management and disposal of diseased plant parts.. So there's this thing about compost, heat, and biological organisms. For any given temperature, there's a given length of time that will cause the organism to be killed. At 180 degrees F, this is pretty short. at 140 degrees, this is a bit longer. Even at 120 degrees F, there's a given time, but it's longer yet. When it comes to backyard gardens and managing disease, it's usually easier to say, dispose. the caveats are, what's the disease problem, how long do you let your compost sit and at what temperature. There are a couple of diseases where the best answer is, get rid of it. Fire works very well in this regard. However, we also live in world where local ordinances can sometimes be...exasperating? I currently live in a town where composting is specifically prohibited. The town doesn't enforce this, unless someone complains, but composting is specifically prohibited. Fire codes are such that a backyard fire pit could be prohibited entirely. Some might say silly, but we live in a world with a lot of people. How many of them would you trust with a match? So how does one provide an answer of how to deal with diseased material, when there are unknowns as to legal environment of the person asking the question, nature of disease organism, and how the compost pile is managed by the person asking the question? You tend to default answers. Composting early blight contaminated plants is different than plants contaminated with powdery mildew, mostly because the danger posed by the disease is different. Peas and cukes are easily replanted and still get a yield that season...much harder with tomatoes. Even harder with orchard crops. Yes, different diseases affect these plants, to varying degrees, but people like simple answers. So the simple across board answers become the default, when the full answer requires a lot of time to get across...and most people just don't have the time to do that with every person who asks the question.