Plant Pathology

Front 1

White Mold

Back 1

Sclerotinia sclerotiorum
ornamentals, field crops, vegetables and weeds. Sunflower & Dry(soy) beans in Midwest.
Ascomycete
Sclerotia - aggregated mycellium

Front 2

Powdery Mildew of Apple

Back 2

Podosphaera leucotricha
Apple - Malus sp. & Pear - Pyrus sp.
Ascomycete
Chasmothecia

Front 3

Powdery Mildew of Turf and cereal grasses

Back 3

Blumeria graminis
Ascomycete
white mycellium -Chasmothecia

Front 4

Dutch Elm Disease

Back 4

Ophiostoma ulmi, Ophiostoma novo-ulmi
Elms - (American) Ulmus (americana)
Ascomycete
Vector - Native or European Elm Beetle.
Root grafts.
'Flagging', vascular discoloration

Front 5

Black Spot of Rose

Back 5

Diplocarpon rosea
Roses - Rosa sp.
Ascomycete
Ascervulus

Front 6

Armillaria Root Rot

Back 6

Armillaria mellea, Armillaria sp.
Hardwoods (angiosperms) & Conifers (gymnosperms)
Basidiomycete
Mycellial Fans
Rhizomorphs

Front 7

Stem Rust of Wheat

Back 7

Puccinia graminis
Wheat - Triticum aestivum
Barley - Hordeum vulgare
Barberry - Berberis sp.
Basidiomycete
5 spore stages to complete cycle:
1. Urediniospores
2. Teliospores
3. Basidiospores
4. Pycniospores
5. Aeciospores

Front 8

Rhizoctonia Disease of Turfgrass

Back 8

Rhizoctonia sp., Rhizoctonia solani
cool & warm-season grass
Basidiomycete
hyphae has 90° angles

Front 9

Pythium Blight of Turfgrass

Back 9

Pythium aphanidermatum, Pythyum ultimum
bentgrass, bluegrass, fescue, ryegrass
Oomycete
warm weather, free water

Front 10

Late Blight of Potato & Tomato

Back 10

Phytophthoria infestans
Solenaceae sp.
Oomycete
Sudden death.

Front 11

Sexual/Asexual spore
Zygomycota

Back 11

S: Zygospore, following fusion of similar gametangia
A: Sporangiospore, non-motile, from sporangium

Front 12

Sexual/Asexual spore Ascomycete.

Back 12

S: Ascospore, in ascus, following fusion of antheridium and ascogonium
A. Conidia
A: Conidia

Front 13

Sexual/Asexual spores of Oomycete

Back 13

S : Oospore - resulting from antheridium & oogonia
A: Sporangium & zoospores _2 flagella