Tree Diseases

Question 1

Monera; no specific host species; galls on stems, branches, and roots; prevented by chemical sprays and destroying infected trees

Answer 1

Crown Gall
Agrobacterium tumefaciens

Question 2

Basidiomycete; infects Juniperus and Malus; orange spots on Malus; galls on Juniperus; spores can travel long distances; prevented by separating hosts and chemical sprays

Answer 2

Cedar-Apple Rust
Gymnosporangium juniperi-virginianae

Question 3

Basidiomycete; infects pine trees; galls on stems and branches; orange spores; treated w/ chemical sprays

Answer 3

Fusiform Rust
Cronartium quercuum f. sp. fusiforme

Question 4

Basidomycete that infects any species; blue discoloration of sapwood; no treatment

Answer 4

Blue Stain Fungus

Question 5

Basidiomycete that decays wood of many species; treated by minimizing wounds

Answer 5

Wood Rot Fungus

Question 6

Ascomycete; no specific host; rapid wilt and dieback of infected plants; treated by destroyed infected trees, chemical sprays, and eliminating vectors

Answer 6

Wilt Fungus
Fusarium, Ophiostoma, Ceratocystis, Verticillium

Question 7

Ascomycota that infects Ulmus, causing rapid wilt and dieback; treated by destroying infected trees or preventing vectors

Answer 7

Dutch Elm Disease
Ophiostoma ulmi

Question 8

Ascomycete that infects Fagaceae, typically chestnuts; Cankers and wilt; destroy infected trees

Answer 8

Chestnut Blight
Cryphonectria parasitica

Question 9

Ascomycete that infects Cornus (Dogwoods); lesions on stems and leaves; chemical sprays and destruction of infected trees

Answer 9

Dogwood Anthracnose
Discula destructiva

Question 10

Ascomycete that infects Laurels; transported by Xyleborus glabratus (beetle); rapid wilt; chemical injections or destruction of infected trees

Answer 10

Laurel Wilt
Raffaelea lauricola