I was told that neem oil should be applied when it is dry. We are still getting rains in Seattle, so I have not tried it yet, but your results sound great. Do you need to spray every other day to get these results? That sounds like a lot of work.

I live in Vancouver,BC which gets more rain than Seattle. I sprayed when the weather is clear. I avoid spraying when the days are hot (yes they are getting hotter here). I have also sprayed after a light rain.
I sprayed every other day at the beginning just to break the aphid breeding cycle...apparently they breed worse than rabbits. Some where on the rose forum, people sprayed everyday for 5 days with safer's soap to break the suckers down. I thought I would do only every other days with neem as it is expensive.
If you have problem finding neem oil, check out your local hypdrponic suppy stores. I did a google search and found it associates with most hydroponic site and seems like they use it a lot to spray "indoor tomato farming"....get the drift. Neem is used to control insects on indoor plants because it is non-toxic. good luck. Neem is a good thing. It costs me $50canadian for a litre (perhaps less in US). It is worthed every penny of it.

It's also overkill for aphids and kills beneficials as well. It doesn't do much for black spot at all and will fry your foliage above about 86°. Plain old inexpensive horticultural oil will do all of the above and a heck of a lot cheaper.

Is there a difference between neem oil and neem oil extract? I couldn´t get the oil so I bought the extract and it works well. I think that only the whole oil works against fungus...is that right? Where can I order neem oil online?
Cyberblue

Azadirachtin, which is the insecticidal fraction, is often separated and sold separately. Non-oily neem products show this as the active ingredient in the label. It works by disrupting the transformation between insect stages. Most neem oils sold in the US are without azadirachtin, but they can still kill small insects by smothering, as would any oil. There are some fungicidal compounds in whole neem oil, but I don't know whether they end up with the azadirachtin or with the separated oil in the typical products. Triact is one brand of whole neem oil that could be googled.

What MichaelG said: double ditto.