Diseases and Insect Pests of Conifers (Evergreen trees) – by species

Douglas-Fir (Pseudotsuga):
Armillaria Root Disease USFS
Armillaria Root Rot
Christmas Tree Pest Manual (USFS)
Disease Management Recommendations for Trees and Shrubs
(Swiss Needlecast)
Dwarfmistletoe of Douglas-fir
Insecticide Suggestions to Manage Landscape Tree and Shrub Insects
HOW to Identify and Control Rhabdocline and Swiss Needlecasts of Douglas-Fir (USFS)

Fir (Abies):
Armillaria Root Disease USFS
Armillaria Root Rot
Christmas Tree Pest Manual (USFS)
HOW to Identify and Manage Needlecast Diseases on Balsam Fir (USFS)

Juniper/Cedar (Juniperus):
Armillaria Root Disease USFS
Armillaria Root Rot
Annosus Root Rot in Eastern Conifers (USFS)
Christmas Tree Pest Manual (USFS)
Disease Management Recommendations for Trees and Shrubs
(Cedar-Apple type Rusts, Twig Blight)
Scale Insects of Trees and Shrubs

Larch/Tamarack (Larix):
Armillaria Root Disease USFS
Armillaria Root Rot
Christmas Tree Pest Manual (USFS)
Eastern Larch Beetle
Insecticide Suggestions to Manage Landscape Tree and Shrub Insects
Larch Casebearer
Sawflies of Trees and Shrubs

Pine (Pinus):
Armillaria Root Disease USFS
Armillaria Root Rot
Annosus Root Rot in Eastern Conifers (USFS)
Brown-Spot Needle Blight of Pines (USFS)
Caterpillar-Like Sawfly Eat Evergreen Needles
Christmas Tree Pest Manual (USFS)
Comandra Blister Rust (USFS)
Diplodia Blight of Pines (USFS)
HOW to Identify and Control Diplodia Shoot Blight, Collar Rot, and Canker of Conifers (USFS)
Disease Management Recommendations for Trees and Shrubs
(Brown Spot, Dothistroma Needle Blight, Lophodermium Needlecast, Pine Needle Rust, Pine-Oak Gall Rust- eastern gall rust, Pine-Pine Gall Rust- western gall rust, Shoot Blight, and White Pine Blister Rust)
Dothistroma Needle Blight
Dothistroma Needle Blight of Pines (USFS)
Eastern Pineshoot Borer (USFS)
European Pine Shoot Moth (USFS)
Insecticide Suggestions to Manage Landscape Tree and Shrub Insects
Introduced Pine Sawfly (USFS)
HOW to Manage Eastern White Pine to Minimize Damage from Blister Rust and White Pine Weevil (USFS)
HOW to Manage Jack Pine to Reduce Damage From Jack Pine Budworm (USFS)
Pales Weevil (USFS)
Pine Needle Rust
HOW to Identify and Minimize Red Pine Shoot Moth Damage (USFS)
Redheaded Pine Sawfly (USFS)
Rust Diseases on Minnesota Pines
Saratoga Spittlebug (USFS)
Sawflies of Trees and Shrubs
Scale Insects of Trees and Shrubs
Scleroderris Canker of Northern Conifers 
Sirococcus Shoot Blight USFS
Sirococcus Tip Blight
Sooty Mold
Sphaeropsis Shoot Blight
HOW to Identify and Control Stem Rusts of Jack Pine (USFS)
White Pine Blister Rust
Woolly Aphids on Trees and Shrubs

Spruce (Picea):
Armillaria Root Disease USFS
Armillaria Root Rot
Yellow-headed Spruce Sawfly
Christmas Tree Pest Manual (USFS)
Cytospora Canker of Spruce
Disease Management Recommendations for Trees and Shrubs
(Cytospora Canker, Lirula Needle Blight, Rhizosphera Needle Cast)
Eastern Dwarf Mistletoe on Black Spruce (USFS)
Eastern Pineshoot Borer (USFS)
Insecticide Suggestions to Manage Landscape Tree and Shrub Insects
Lirula Needle Blight

Sawflies of Trees and Shrubs
Scale Insects of Trees and Shrubs
Scleroderris Canker of Northern Conifers
Sirococcus Shoot Blight (USFS)
Spruce Budworm
Spruce Needle Rust
Woolly Aphids on Trees and Shrubs

More publications:

Insects

MyMinnesotaWoods
The University of Minnesota Extension Forestry team.

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3 Comments

  1. We have planted white pine up north that are about 2-3 foot high. This is about the 3rd year for them. We noticed this wknd on like the stem of the tree for several inches is this white stuff and on a few the white stuff is on the branch needles. What exactly is this and how do we deal with it? Thank you.

  2. We have a worm eating our spruce. North east minnesota. The worms dangle on a thread and leave lower branches bare. We have about 50 infected trees an it is getting worse. Are my trees in danger of their life? I think that last year we had a tiny moth breakout and am wondering if that is going to happen again,,in bigger numbers.