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MBY 261 Exam Questions And Accurate Answers
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MBY 261 Exam Questions And Accurate AnswersPhytophthora kernoviae hosts - Answer Magnolia
Rhododendron
Phytophthora kernoviae area - Answer kzn
mpumalanga
eastern and western cape
Phytophthora kernoviae symptoms - Answer shoot dieback
leaf and root necrosis
plant death
Phytophthora kernoviae dissemination - Answer rain splash, wind driven rain, irrigation
and ground water
long distance= infected plant material, growing media and in soil carried on vehicles,
machinery, footwear or animals
Phytophthoras of Eucalyptus - Answer P. frigida
P. alticola
P. nicotiana
Phytophthoras of eucalyptus symptoms - Answer progressive wilting of leaves due to
girdling of root collars
brown lesions extending from roots
root disease
bleeding lesions from diseased stem tissue
, Phytophthoras of citrus - Answer P. nicotianae
P. parasitica
Phytophthoras of citrus symptoms - Answer foot rot
root rot
gummosis
entire rootlet rots
leaf = yellow foliage and root die back
trunk = lesions at bark or at the bud union that exude gum, brown necrotic area under
bark lesions
whole tree= poor health, thin canopy
Phytophthora cinnamomi on avocado - Answer infects avocado
over-irrigation worsens problem
hemibiotroph
A1+A2 needed for sexual reproduction
soil-borne, infects the feeder roots
bi-flagellate zoospores
chlamydospores
Phytophthora cinnamomi avocado symptoms - Answer leaf wilting and yellowing
sparse leaf canopy, fruit is exposed
tree death
feeder roots= brown, black, brittle
Phytophthora cinnamomi on fynbos - Answer root rot in Proteaceae species
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