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PPATH 318
plant diseases
44
Other
Undergraduate 2
03/21/2011

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Term
rusts are...
Definition
obligate parasites
Term
Fusiform Rusts
Disease Cycle
Definition
(pine stem) Pycnia -> Aecia
(Oak Leaves) Uredia -> Telia -> Basidia
PAUTB
Term
Fusiform Rust
5 spore stages
Definition
Pycnia (Pine)
Aecia (Pine)
Uredia (Oak)
Telia (Oak)
Basidia (Oak)
Term
Fusiform Rust
control
Definition
resistant varieties of pine
pruning (landscape)
inoculate pines with basidiospores
Term
white Pine Blister Rust
Native or Exotic
Definition
exotic
Term
white Pine Blister Rust
Hosts
Definition
5 needle pines
eastern white
western white
whitebark
limber
sugar
Term
white Pine Blister Rust
Symptoms
Definition
dead tree tops
bleeding from rust canker
blister rust
Term
white Pine Blister Rust
signs
Definition
uredia
Term
white Pine Blister Rust
5 spore stages
Definition
Pycnia (pines)
Aecia (pines)
Uredia (currants)
Telia (currants)
Basidia (currants)
Term
White Pine Blister Rust
Disease Cycle
Definition
Pycnia -> Aecia (Pines)
Uredia -> Telia -> Basidia (Currants)
Term
white Pine Blister Rust
Controls
Definition
Remove all ribes
pruning young pine in plantations
prune cankers in landscapes
Term
Fusiform Rusts
Hosts
Definition
Southern Pines
Loblolly
Slash
Term
Root Diseases Caused By..
Definition
Parasitic seed plants
Term
Annosum Root Rot
Suspects
Definition
Loblolly Pine
Slash Pine
Western Conifers
Term
Annosum Root Rot
Disease Cycle
Definition
Starts at fresh stump
Term
Annosum Root Rot
Symptoms
Definition
Crown thinning
windthrow & stem breakage
yellow stringy root rot*
stand: circular infection
heart rot in lower trunk
resin soaking of wood
Growth loss*
Term
Annosum Root Rot
sign
Definition
conks
Term
Annosum Root Rot
controls
Definition
application on Borax on fresh cut stump
thin in hot months
resistant varieties
avoid high hazard sites
Term
Armillaria Root Rot
suspects
Definition
too many
Term
Armillaria Root Rot
abiotic stress
Definition
drought
frost
nutrients and soil factors
logging disturbance
Term
Armillaria Root Rot
disease cycle
Definition
inoc: rhizomorphs contact roots -> spores contact stumps or wounds
pen: mechanical / chem. pressure
colo: mycelial fan
surviv: in root, stumps and logs
dissem: wind blows spores
Term
Armillaria Root Rot
signs
Definition
fresh rhizomorphs
old rhizomorphs
mycelial fan
mushrooms
Term
Armillaria Root Rot
symptoms
Definition
lignin
reduced growth
foliar effects
crown dieback
tree mortality
Term
Armillaria Root Rot
control
Definition
stump removal in select cases
plant less susceptible species
keep trees healthy
Term
Vascular Wilts...
Definition
colonize xylem intracellularly
stop upward movement of nutrients
wilts and kills tree
Term
Vascular Wilts
mechanisms
Definition
spores and mycelium plug vessels
fungus make enzymes -> degrade cell wall
fungus makes water thicker
fungus induce host and make tyloses
tyloses makes gums and phenolic & airbubles that choke host
Term
DED
causes
Definition
3 ascomycete
exotic fungus
Term
DED
symptoms
Definition
flagging
branch dieback
wilting
vascular discoloration
death
Term
DED
dissemination
Definition
TOP - insects

BOTTOM - root grafts
Term
DED
controlls
Definition
spraying insecticide
pruning + fungicide injection
trap trees
trenching
remove infected wood
no prune in june
resistant varieties
Term
Oak Wilt
Hosts
Definition
most oaks
RED OAK
Term
Oak Wilt
symptoms
Definition
premature leaf defoliation
branch die back
wilting
vascular discoloration
death
cracks in bark
Term
Oak Wilt
causes
Definition
ascomycete fungus
native endemic wilt fungus
Term
Oak Wilt
sign
Definition
pressure pad
Term
Oak Wilt
Dissemination
Definition
insect, root grafts and wind

insect smells pressure pad eats pressure pad and goes to next tree
Term
Oak Wilt
controls
Definition
fungicide injections
trenching
resistant species
dont prune in june
Term
Verticillium Wilt...
Definition
soil born fungus
Term
Verticillium Wilt
symptoms
Definition
wilting and necrosis
decline in canopy
unilateral wilting
vascular discoloration
Term
Verticillium Wilt
hosts
Definition
MAPLE*
ash
cherry
dogwood
Term
Verticillium Wilt
control
Definition
when replacing dead tree plant a resistant specie
Term
Bacterial Leaf Scorch
suscepts
Definition
OAK*
Maple
Elm
Term
Bacterial Leaf Scorch
Symptoms
Definition
Marginal Burn with yello whalo
leaf burn on inner and lower leaves
branch and tree death over time
Term
Bacterial Leaf Scorch
Dissemination
Definition
tree hopper
leaf hoppers
spittlebugs
Term
Bacterial Leaf Scorch
controll
Definition
prune affected branches
care for moderately affects trees
remove severely affected trees
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