Leyland Cypress Browning: Three Canker Diseases Compared

Leyland Cypress Dying from Bottom Up: Disease ID Guide

Three main diseases cause Leyland cypress decline. You must inspect branches to distinguish:

Disease	Key Symptoms
Seiridium Canker	Bleeding cankers; needles fall easily when branch rubbed
Botryosphaeria Canker	Sunken V-shaped cankers; no sap; needles persist
Passalora Needle Blight	Browning starts low/inside, spreads up/out; no cankers; one-sided

Clemson Extension guide with specific treatments: HGIC 2004

If correctly identified and treated, trees can recover.

Trees: Leyland Cypress Interior Yellowing: Shade, Not Disease; Leyland Cypress: Tree or Hedge? Root System, Transplanting, and Pruning; Leyland Cypress Decline: Cankers, Pests, and Professional Diagnosis; Leyland Cypress Winter Damage in PA: Replace with Green Giant; Neighbor's Cypress Roots Damaging Driveway and Foundation; Leyland Cypress: Why Severe Pruning Will Kill It; Leyland Cypress Browning: Canker Diseases and Management; Watering New Leyland Cypress and Plum Trees; Leyland Cypress Care: Fast-Growing Privacy Screen; Leyland Cypress Dieback: Seridium Canker from Drought and Cold

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