As covered by Hili & boa, look for signs of Cypress Canker. With canker you usually see whole twigs die off at once where you seem to have a mix of leaves that are live and dead on the same twigs. If no signs of canker then it looks like you may have just got a bit too "keen" with the hedge trimmer perhaps and exposed the interior leaves that naturally die off.
Whats the foliage like higher up in the tree where it hasnt been trimmed as much?
Is this a single example of the species you have?
Are there any others nearby or even in neighboring properties with similar symptoms? |