Both dry and wet conditions can lead to plant diseases. Many diseases require 14 hours of continuous wetness to penetrate the leaf surface, therefore avoid watering in the late afternoon and evening. It's best to water in the early morning, allowing efficient water use and providing adequate time for the grass to dry, Goldberg said. Irrigate deeply so the water moves completely through the root zone, she said. Goldberg said homeowners should water according to the lawn's needs instead of on a set schedule because the amount needed varies depending on the type of grass and time of the year.
Some diseases prefer nutrient-starved turf, while others like large amounts of nitrogen.
In general, homeowners should apply 50 percent or more of the total yearly nitrogen in the fall, Goldberg said. Applying fertilizer in the spring will help reestablish grass that was dormant during the winter. Applying a slow-release nitrogen fertilizer may be useful, Goldberg said. Mowers should be kept in good working condition with sharp blades, Goldberg said. Avoid switching back and forth from short to tall grass.