Dolichousnea longissima

are eaten by

• Global Biotic Interactions: Dremomys lokriah (Hodgson 1836) (Orange-bellied Himalayan Squirrel)

are host of

• Global Biotic Interactions: Lambdina fiscellaria Guenée 1858 (Hemlock Looper)

have host

• Global Biotic Interactions: Quercus garryana Douglas ex Hook. (Brewer Oak)
• Global Biotic Interactions: Pseudotsuga menziesii (Mirb.) Franco (Douglas Fir)
• Global Biotic Interactions: Abies alba Mill. (Silver Fir)