BTNY 301 Exam II

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Anonymous
ID:
204624
Filename:
BTNY 301 Exam II
Updated:
2013-03-03 14:41:12
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Wk
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Prokaryotes
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  1. Citrus Canker
    • Xanthomonas axonopodis
    • irradiated several times
    • generally moves short distances but hurricane
    • Mostly cosmetic, spots but can be serious
    • Management: remove trees and quarantine
  2. Southern Bacterial Wilt
    • Ralstonia solanacearum
    • ~200 hosts, tomato & banana
    • Extremely dangerous
    • Worldwide
    • Adapted to life in soil
    • Clogs in xylem vessels
    • Some races like cool and warm
  3. Bacterial Wilt of Cucurbits
    • Erwinia Tracheiphila
    • Spreads by beetle
    • Entire plant wilts and dies
    • stringing- diagnostic
    • Management: control beetle, remove infected plants
  4. Fastidious Vascular Bacteria
    • Picky eaters, can't grow outside host
    • Limited to vascular tissue
    • Rod-shapped w/o flagella
    • rippled cell wall
    • have to spread by insects
  5. Pierce's Disease of Grape
    • Xylella Fastidiosa
    • Wide host range
    • serious in warm areas
    • Vector: Blue-green, glassy-winged, green-winged sharpshooter
    • Grapes: sudden leaf scorch, vines wilt, delayed growth
    • no practical control- plant away from trees
  6. Citrus Greening / Huanglongbing
    • Candidatus Liberibacter asisaticus
    • Most serious citrus disease in the world
    • Vector: psyllid bug
    • No cure, causes symmetric spots
  7. Mycoplasmas
    • Myco- fugi plasma- flowing
    • Can't be gown in artificial media
    • isolated in 1898
    • no cell wall, small
    • Reproduce- budding fission
  8. Phytoplasmas
    • First ID 1967
    • First though was virus but sensitive to antibiotic
    • OW: in incests or perennial
    • Very small 1/4 of bacteria
    • no cell wall, many shapes
    • in Phloem
    • Symptoms: Discoloration, stunting, lots of shoots, green/sterile flowers
  9. Aster Yellows
    • Phytoplasma
    • Very common
    • Wide host range
    • OW in perennials
    • Vector: leaf hopper, 3-week incubation to build up pop
    • Management: Remove diseased plants, grow less susceptible, control insects and weeds
  10. Poinsettia phytoplasm
    • Free branching
    • Figured out 1932
    • Creates smooth leaves and many branches

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