I know everyone says that it is best to not water plants from the top and to keep the water off of the leaves but, I personally ignore that and always water my plants from the top down (well, most of the time). The way I look at it, in nature; the only way things are watered is by rain and rain always waters from the top down. No other way it can water. So, anyway, that is what I try to do.
I know the story about perpetuating fungal diseases by getting water on the leaves but, I have a rebuttle for that. If you only water the soil, there will be water around the stomata there allowing more water vapour to escape the plant, by having water on the leaves, less water is lost due to evaporation. And I have never really had any problems with fungal diseases. Nothing to drastic anyway.
Garden organically, make sure your soil has lots of humus and your plants will be strong, healthy and able to fight off any diseases.
Incidentally, plant leaves are literally crawling with various orangisms including nematodes, fungi, bacteria, protozoa and so on. Yes, there are some pathogens in there but, the vast majority of the organisms are actually beneficial. And the beneficials keep the pathogens in check.