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Yellow foliage

Adelges cooleyi
( Cooley Spruce Gall Adelgid )

Armillaria ostoyae
( Armillaria Root Disease )

Carulaspis juniperi
( Juniper Scale )

Chrysomyxa arctostaphyli
( Spruce Broom Rusts )

Coleophora laricella
( Larch Casebearer )

Coleosporium asterum
( Western Pine - Aster Rust )

Dendroctonus ponderosa
( Mountain Pine Beetle )

Dendroctonus pseudotsuga
( Douglas-fir Beetle )

Dendroctonus rufipennis
( Spruce Beetle )

Elatobium abietinum
( Spruce Aphid )

Elytroderma deformans
( Elytroderma Needle Cast )

Heterobasidion annosum
( Annosus Root Rot and Butt Rot )

Hylobius warreni
( Warren's Root-Collar Weevil )

Hypodermella laricis
( Larch Needle Blight )

Inonotus tomentosus
( Tomentosus Root Disease )

Isthmiella crepidiformis
( Isthmiella Needle Blight of Spruce )

Lirula macrospora
( Lirula Needle Blight )

Lophodermium piceae
( Common Needle Diseases of Spruce )

Melampsora spp.
( Melampsora Foliage Rusts )

Melampsorella caryophyllacearum
( Fir Broom Rust )

Meria laricis
( Larch Needle Cast )

Oligonychus ununguis
( Spruce Spider Mite )

Rhabdocline pseudotsugae
( Douglas Fir Needle Blight )