Your water management districts, Cooperative Extension Service, USDA Natural Resources Conservation Service or an irrigation professional can provide technical assistance. This is the most efficient time because temperature and wind speeds are at their lowest and evaporation is reduced. Also, grasses will be less susceptible to fungus if water is applied at the time dew normally forms. Don't apply more water until symptoms reappear. Experiment with gradual reductions in irrigation to see if plants can tolerate less water.
Some people use no irrigation, yet have healthy plants.
In some landscape situations, such as a lawn or bed of flowering annuals, that's the best method for applying water. If you are in the market for a new irrigation system, find a reputable irrigation contractor who has experience with these systems. Be aware that drip or micro-spray fittings may clog and require filtration of the source water, regular inspection and possibly cleaning. Drip tape or tubing can be damaged by insects and rodents. Free inspection of irrigation system efficiency is available in some areas through the Natural Resources Conservation Service.