All our daylilies are on an automatic watering system and are watered every other day so they never dry out. I don't know if water slows them down or not, I just know it doesn't prevent them. It doesn't take very long for them to destroy the foliage. Spider mites eat the foliage from the back side so by the time you notice the foliage looking ratty and dying they have moved on to a different area. They lay eggs while there feeding, so I spray three weeks in a row to make sure I get the babies that hatch. If you only have a few daylilies you may never get spider mites, if you do you might find some products at Lowes or another box store that's much cheaper than what I use.
