What's eating my cathaya argyrophylla?

Cathaya argyrophylla (Cathay Silver Fir) is critically rare in the wild and virtually unknown in cultivation outside China's specialist botanic gardens. Pests documented are limited, but as a relict conifer it shares typical conifer vulnerabilities: aphids on new growth, scale on bark, and bark beetles in stressed specimens. Habitat loss is the true existential threat.

Colonies on soft new needles; honeydew deposits and sooty mould; mild needle discolouration in spring Neem oil or insecticidal soap spray; encourage natural predators; strong water spray for light infestations on accessible growth

Waxy or crusty scale deposits on stems and needle bases; needles yellowing below infested areas; sooty mould Horticultural oil spray at crawler emergence in spring; scrub light infestations off manually; repeat application after 3 weeks

Frass and pitch at bark entry points; galleries under bark; branch dieback, especially on drought-stressed trees Maintain tree health with adequate watering; remove infested material; preventive bark spray in spring on high-value specimens