The susceptibility of conifers varies.
Susceptible species
- Cupressus macrocarpa (Monterey Cypress) (most susceptible when less than 10 years old)
- Chaemaecyparis lawsoniana – various cultivars
- x Cupressocyparis leylandii ‘Castlewellan Gold’
- x Cupressocyparis leylandii ‘Leighton Green’
- x Cupressocyparis leylandii ‘Naylors Blue’
- Cupressus lusitanica
- Cupressus sempervirens ‘Swanes Golden’ and other cultivars
- Cupressus torulosa
Less susceptible
- Cupressus arizonica (Arizona cypress)
- Calocedrus decurrens
- Thuja plicata (Western Red Cedar)
- Thuja occidentalis
- Juniperus virginiana