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Whats the best/cheapest/natural (3 separate questions or 1?) way to control mildew on plants?

We have a lot of roses that had not been nurtured for years, and they are really struggling with mildew (black, white, yellow, you name it these roses got it).

I'm also getting a small garden started and noticed white mildew showing up on my pumpkin leaves.

Will the same solution work for many different types of plants and mildew, or will I need to trouble shoot each case individually?

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up vote 5 down vote accepted

First, what you'd use on roses is bound to be different from what you use on crop or food plants, in terms of pesticides. Judicious pruning of roses to open up the bushes and increase air flow helps.

Secondly, there is one natural cheap solution for them all, if its powdery mildew - 1 part cow's milk to 9 parts water, sprayed until run off over all leaves (both sides) and stems.

Powdery mildew occurs more often when plants are a bit stressed through drought, and keeping plants fed and watered optimally helps to fend off infection generally, but overcrowding of plants and very damp weather contribute to all forms of fungal infection, including mildews.

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