Everything has finally succumb to either mosaic virus, powdery mildew and my melons went from healthy looking to dying in 3 days from either some fungus infection or angular leaf spot, mites and mosaic virus killed all my watermelons over a period of week.

I grow on my roof, Mediterranean, large flat roof

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Now I am a novice gardener, should I rip out all my perennials like strawberries, peppers, herbs, grape vine etc etc that may also be infected with mosaic virus but are showing no symptoms. Should I bleach the entire roof and kill every living organism up there?

I really don't want to go through all this again next year. One thing is for sure, I am going to (unfortunately) start out with chemical pesticides as IMO soap/neem/milk just doesn't cut the mustard, well not with the limited time I have.