The answer to 'irrigation system dead trees' is that a malfunctioning irrigation system is a common cause of dead trees in a landscaping. Symptoms may include wilting, yellowing leaves, and tree mortality. Solutions can include inspecting and repairing the irrigation system, adjusting watering schedules, and replacing damaged trees.
If the irrigation issues are widespread or you're unsure of the cause, it's best to call in a professional landscaping technician. They can diagnose the problem, make necessary repairs, and provide recommendations to restore the health of your trees and landscaping.