Additional Things To Consider
Even when watering at the base of plants and avoiding getting any water on the leaves, the stems of plants still get water on them. Also plenty of water gets on the mulch and the soil which is exactly where the fungi live. Furthermore, every single night, plant foliage gets wet. This is evidenced by dew. Dew does not form only in the few minutes before the sun comes up. Moisture can form on leaves at any time of night when conditions are right, thus leaves can be wet for hours before being dried by sun and/or air movement. If the presence of the sun in daytime helps provide conditions that prevent fungal disease, then the absence of the sun at night must help provide conditions that promote fungal disease. Yet, the world of plants is not overrun with nighttime sprouting fungal disease, not even in rainy, wet humid rainforests. What this means is that there's something else going on causing extreme plant fungal disease in gardens. Something else is going on such as ecosystem imbalance and many other things like tampering and hybridizing and weakening plant genetics, growing plants unsuited to changing climate conditions and human practices that give plant-harming fungi an advantage. We know food is the same thing as medicine. Since water is also food medicine for plants, perhaps another one of those things out of balance is the health of the water and other nutrients plants are eating.Water when absolutely necessary and water however you want to as you seek balance in all things - Maat.
Farming - The Gandhian Way