Is it a disease? Self diagnosis is the first step.

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Disease diagnosis begins with the grower. It's like the game of Clue - you must figure out who, where, and how. This presentation helps growers of all kinds gather clues and work though disease diagnosis by the process of elimination.

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Is it a disease? Self diagnosis is the first step.

  1. 1. IS THIS A DISEASE?STEP 1: THE INVESTIGATIVE PROCESS
  2. 2. BECOME YOUROWNINVESTIGATORStep 1: Determinewhether the malady isactually a diseaseStep 2: Know what tosample and what to dowith it
  3. 3. IT’S LIKEPLAYINGCLUEWhereWhoHow
  4. 4. PART 1WHERE?
  5. 5. WHERE?Leaf• Entire leaf• Upper side• New leaves• Leaf margins• Canopy dieback• Inner canopy• Entire plant
  6. 6. WHERE?Leaf• Entire leaf• Upper side• New leaves• Old growth• Canopy dieback• Inner canopy• Entire plant
  7. 7. WHERE?Twigs &Branches• Upper canopy• Young twigs• Lower branches
  8. 8. WHERE?Twigs &Branches• Upper canopy• Young twigs• Lower branches
  9. 9. WHERE?Trunks & Crowns• Soil line• Upper trunk• Sunken• Callus• Watery and mushy• Dry rot• Girdling
  10. 10. WHERE?Trunks & Crowns• Soil line• Upper trunk• Sunken• Callus• Watery and mushy• Dry rot• Girdling
  11. 11. WHERE?Roots• Black roots• No visible roots• Smell• Dry rot• Mushy, wet rot
  12. 12. WHERE?Roots• Black roots• No visible roots• Smell• Dry rot• Mushy, wet rot
  13. 13. PART 2HOW?
  14. 14. HOW?Wounds• Mechanical wounds• Pruning cuts• Insect damage• Sun scald
  15. 15. HOW?Wounds• Mechanical wounds• Pruning cuts• Insect damage• Sun scald
  16. 16. HOW?Inoculum load• Overwintering cankers• Poor sanitation• Diseased stock• Fallen leaves
  17. 17. HOW?Inoculum load• Overwintering cankers• Poor sanitation• Diseased stock• Fallen leaves
  18. 18. HOW?Vectors• Aphids• Thrips• Whiteflies• Mites• Nematodes• Borers & beetles
  19. 19. HOW?Vectors• Aphids• Thrips• Whiteflies• Mites• Nematodes• Borers & beetles
  20. 20. HOW?Microclimates• Overhead irrigation• Poor air circulation• Close spacing• Shady• Foggy• Greenhouse
  21. 21. HOW?Microclimates• Overhead irrigation• Poor air circulation• Close spacing• Shady• Foggy• Greenhouse
  22. 22. PART 3WHO?
  23. 23. WHO?Fungi• Leaf spots• Root rots• Cankers• Blights• Visible fruiting bodies
  24. 24. WHO?Fungi• Leaf spots• Root rots• Cankers• Blights• Visible fruiting bodies
  25. 25. WHO?Fungi• Leaf spots• Root rots• Cankers• Blights• Visible fruiting bodies• Wilts
  26. 26. WHO?Bacteria• Leaf spots• Cankers• Blights• Wilts• Scorch
  27. 27. WHO?Bacteria• Leaf spots• Cankers• Blights• Wilts• Scorch
  28. 28. WHO?Water Molds• Leaf blotches• Crown rots• Collar rots• Root rots• Mushy smelly roots• “nibbled” roots
  29. 29. WHO?Water Molds• Leaf blotches• Crown rots• Collar rots• Root rots• Mushy smelly roots• “nibbled” roots
  30. 30. WHO?Viruses• Misshapen leaves• Long internodes• Color changes• Witches broom• Leaf mottling or marbling• Vein clearing
  31. 31. WHO?Viruses• Misshapen leaves• Long internodes• Color changes• Witches broom• Leaf mottling or marbling
  32. 32. PART 3SECRET PASSAGES - IMPOSTERS?
  33. 33. IMPOSTERS?Nutritional• Stunting• Chlorosis• Discoloration• Decline
  34. 34. IMPOSTERS?Wateravailability anddrainage• Wilting• Wet feet
  35. 35. IMPOSTERS?Geographyand orientation• Sunscald• Freeze damage• Wet feet• Stunting
  36. 36. IMPOSTERS?Mechanicaldamage• Wilting• Stunting
  37. 37. IMPOSTERS?Insect damage• Chewing insects• Borers• Galls• Sucking insects, sooty mold• Grub damage
  38. 38. PART 4MAKE A SUGGESTION - INVESTIGATE
  39. 39. INVESTIGATEPut it alltogether• Grab a lens• Trace back leaf blight• Crawl around the base• Dig• Dump pots
  40. 40. PART 5FILLING THE ENVELOPE
  41. 41. SAMPLESUBMISSION?Know what andwhen to submit• Disease• Insects• Abiotic problems• Whole plants• Leaves• Roots
  42. 42. 2010 PLANT DISEASE DIAGNOSTICSUMMARY FOR WOODY ORNAMENTALS Cultural 19% No Disease 28% Inadequate Specimen 1% Chemical Injury 2% Pathogen 34%
  43. 43. PLANT DISEASE DIAGNOSTIC LABSample submission• Use the Disease Description form http://www.ca.uky.edu/agcollege/plantpathology/ext_files/submitting-ppa9.pdf• Provide early and mid-stages of the problem• Dead is too late• Dig, don’t pull roots• Submit entire plants when possible (roots, soil, foliage)• Branches should be 12” long• Use plastic bags
  44. 44. PDDL RESOURCE PAGE
  45. 45. FIRST OF TWO FORMSAbout the client• Contact information • Email address? • Speedy reply• Agent office receives both copies• Agent forwards a copy to client
  46. 46. SITE INFORMATIONThis form is NOT optionalDescribe in detail: • Symptoms • Site history • Cultural practicesPrint on yellow paper
  47. 47. ARE YOUREADY?WhereWhoHow
  48. 48. Nicole Ward, Extension SpecialistDepartment of Plant Pathologywww.ca.uky.edu/agcollege/plantpathology/people/ward.htmnicole.ward@uky.edu859-218-0720 office859-797-3333 mobile/textFacebook:UK - Diseases of Fruit Crops, Ornamentals, & Forest TreesTwitter:@Nicole_WardUKBlogger:nicolewarduk.blogspot.com

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