The answer to 'why is my irrigation system dead trees' is that a malfunctioning irrigation system can lead to under-watering or over-watering, both of which can cause trees to die. Common causes include broken pipes, clogged sprinkler heads, faulty timers, and leaks in the system. Symptoms include dry, wilted leaves, discolored foliage, and stunted growth.
To troubleshoot, first check the irrigation controller and timer to ensure the system is running properly. Inspect sprinkler heads and pipes for any damage or blockages. If you're unable to identify and fix the issue, it's best to call a professional irrigation technician to diagnose and repair the system. They can properly adjust the watering schedule and ensure the system is delivering the right amount of water to your trees.