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Exam (elaborations)

MBY 261 Exam Questions And Accurate Answers

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  • Course
  • MBY 261
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  • MBY 261

MBY 261 Exam Questions And Accurate Answers...

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  • September 13, 2024
  • 10
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MBY 261
  • MBY 261
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MBY 261 Exam Questions And Accurate Answers


Phytophthora 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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