Lec 6 Flashcards
Who is Anton De Bary?
Father of plant pathology
What is IDM?
Impatiens downy mildew
plasmopara destructor
What is happening to impatiens that is concerning in ontario?
They are becoming smaller and less developed
What is the scientific name for a touch me not impatient
I. walleriana
What are characteristics of Himalayan balsam impatiens?
Susceptible to IDM
invasive species
in canada
What are characteristics of new guinea impatiens
Hybrid
sun impatiens
large dark red
do well in rain and wind
tolerant to disease
not the most popular
Why is it named touch me not?
when the fruit is ripe it explodes when touched
What are symptoms of IDM?
Anything above ground is affected
infect from bottom up
white patches on top of leaves
plant becomes stunted and looks sad
plant collapses
What environment does IDM thrive in?
High moisture and wet foliage
cool
dry and warm
IDM pathogen characteristics?
Plasmopara destructor
kingdom chromista
water molds
algae rather than fungi
cellulose rather than chitin
biotroph
aggressive
specific to I. walleriana
What pathogen is specialized for I. walleriana?
Plasmopara
What pathogen is specialized for I. balsamina?
P. velutina
What pathogen is specialized for I. noli-tangere?
P. obducens
What is a sporangiophore?
Stalk
What is a sporangium?
zoospores
What is a zoospore?
mobile asexual spore
biflagellate
need water to be mobile
What is an Oospore?
sexual resting spore
survival structure
are able to overwinter in plant debris
thick walls
Life cycle of oospores
Germinate
infect
growth
sporangia produced
spores spread
symptoms in 5-14 days
oospores produced and survive for more cycles
Can you treat an infected plant?
no u can decrease symptoms but they are too hard to fully treat
Can you prevent infection in a plant?
Yes!
What is a prevention chemical?
mancozeb
Fungicide characteristics?
Rotate use so no resistance is developed
systemic and protectant
need proper mode of action
What are non chemical preventions?
Sanitize
decrease moisture
isolate disease
dont reuse soil
have biosecurity in mind
Can preventative and curative measures cause for resistance?
Yes unfortunately just like imara XDR and Beacon
