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BACTERIAL DISEASE

BACTERIAL DISEASE. BACTERIA. Lack chlorophyll and cannot produce own food Require 400 to 600X magnification Flagella to swim. BACTERIA. PATHOGEN Pseudomonas, Xanthomonas , Agrobacterium, and Erwinia. BACTERIA. LIFE CYCLE Dormant in plant material or soil

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BACTERIAL DISEASE

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  1. BACTERIAL DISEASE

  2. BACTERIA • Lack chlorophyll and cannot produce own food • Require 400 to 600X magnification • Flagella to swim

  3. BACTERIA PATHOGEN • Pseudomonas, Xanthomonas, Agrobacterium, and Erwinia

  4. BACTERIA LIFE CYCLE • Dormant in plant material or soil • Reproduce by mother cell dividing in half • 2 daughter cells

  5. BACTERIA • Halo around bacterial leaf spot

  6. BACTERIA INFECTION • Do not produce spores (there are exceptions) • Pathogen appears as ooze

  7. BACTERIA INFECTION • Enter plant through natural openings or wounds

  8. BACTERIA CONTROL • Prevent injuries and introduction • Copper containing fungicides • Bordeaux mixture (Copper sulfate and lime) • Kocide

  9. FIRE BLIGHT HOST: Rose family (pear, apples, quince…) • Bradford pear

  10. FIRE BLIGHT SYMPTOMS • "Scorched" branches • Shepherd’s crook

  11. FIRE BLIGHT INFECTION • Enter through flowers • "Ooze" at cankers

  12. FIRE BLIGHT CONTROL • Resistant cultivars • Pruning and sanitizing

  13. Fire Blight

  14. Fire Blight

  15. Fire Blight

  16. Fire Blight

  17. Bacterial Leaf Spot • Ivy

  18. VIRUS

  19. VIRUS • True obligate parasites • Outside living cells act like chemical substances • Cannot be cultured on artificial media • Virions: virus particles, seen only with a electron microscope

  20. VIRUS SYMPTOMS • Mosaic / mottling • Loss of vigor • Distorted growth

  21. VIRUS INFECTION • Infected for life • Commonly transmitted by insects • Thrips…

  22. VIRUS

  23. VIRUS INFECTION • Rarely kill plant in short amount of time • Predispose plants

  24. VIRUS CONTROL • Avoid transmitting by plant parts • Reduce vectors • Resistance

  25. Citrus Greening Disease • Severe damage to citrus industry

  26. Citrus Greening Disease • Vectored by Asian citrus psyllid

  27. Citrus Greening Disease • Fruit inedible and juice undrinkable

  28. CAMELLIA YELLOW MOTTLE SYMPTOMS • Sporadic leaves and flowers • Not stable year to year • Flowers lose color, variegated

  29. CAMELLIA YELLOW MOTTLE CONTROL • Avoid contaminated stock • Remove plant, if undesirable

  30. Canna Virus • Vein streaking • Weakened plants • Lack of flowering

  31. Canna Virus • Aphids suspected vector • No resistant varieties

  32. Nonviral Variegation • Genetic mutation is heritable • Some cells stop producing chlorophyll

  33. Viral Variegation

  34. Firepower Nandina • Propagated in South Carolina • Infected with two viruses • Cucumber mosaic virus • Nandina mosaic virus

  35. Hosta Virus

  36. Hosta Virus

  37. NEMATODES

  38. NEMATODES • Unsegmented roundworms • Can be found in every form of plant and animal • Most are considered beneficial

  39. NEMATODES SPECIES • Sting, Root knot, Cyst, and others

  40. NEMATODES SPECIES • There are beneficial species attacking insects

  41. NEMATODES SYMPTOMS • Stunting • Yellowing • Wilting • Stubby roots

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