Diseases

Question 1

Transmitted by Pw –> Ribes –> Pw

Dead red/yellow tops

Diamond shaped canker on stem or branches

Orange fruiting bodies in spring/early summer

Tree dies above canker on main stem

Answer 1

White Pine Blister Rust

Cronartium ribicola

DSB

Question 2

Large round ball of densely packed foliage

Often higher up in tree and packed against main bole

Answer 2

Spruce Broom Rust

Question 3

Transmitted by root contact, spores

Laminated advanced decay

Answer 3

Laminated Root Disease - Cedar Form

Phellinus weirii

DRL

Question 4

Grows on most conifers

Conk with brown underside

Red incipient decay, white pitted advanced decay

Answer 4

Red Ring Rot

Phellinus pini

DDP

Question 5

Py and Pl of all ages

Round galls on branches/main stem

Orange fruting bodies in spring

Answer 5

Western Gall Rust

Endocronartium harknessii

DSG

Question 6

Seeds explode up to 10m

Lw preferred, also on Pl, Pw and Bg secondary

Fan shaped arial shoots, witches brooms

Answer 6

Larch Dwarf Mistletoe

Arceothobium laricis

DML

Question 7

Seeds explode up to 10m

Pl prefereed, also Py secondary

Whorled arial shoots, witches brooms, branch swelling

Slow process leading to mortality

Answer 7

Lodgepole Pine Dwarf Mistletoe

Arceuthobium americanum

DMP

Question 8

Transmittal through root contact, rhyzomorphs

Hits all confiers

Reduced leader growth, crown thinning, light green chlorotic foliage, red foliage

Openings in forest of hardwoods and other resistant species

Honey mushrooms

Fan shaped mycelium under bark

Predisposes tree to beetle attack and windthrow

Answer 8

Armilaria Root Disease

Armillaria ostoyae

DRA

Question 9

Transmitted by root contact

Fd, Bg and coastal species highly susceptible

Cw and deciduous immune

Laminated root layers, chlorotic thinning foliage, distressed cones

Downed trees w/fist shaped roots

Whitish mycelia on foot surfaces, fruiting bodies rare

Answer 9

Laminated Root Rot

Phellinus weirii

DRL