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Master Gardener
Plant Diagnostic
Specialist Training
Part 1: Abiotic Issues
What is Diagnostics?
• Process used for the identification of problems
• Tools
–Plant sciences: horticulture, soil science...
Categories of Abiotic Problems
• Weather: temperature & rain/drought
• Irrigation issues
• Soil factors
• Fertility
• Chem...
Be familiar with historic weather events
Source: https://weatherspark.com/history/30206/2015/Eugene-Oregon-United-States
Winter Injury
PNW Disease
Management Handbook
->Pathogen Articles
->Nonpathogenic Phenomena
->Winter Injury of Landscape P...
Low & High Temperature Damage
• Some plants tolerate
lower/higher temps
• Acclimatization is
important
• Easily confused w...
Moisture
extremes
• Short-term or
chronic effects
Megan Kennelly, Kansas State University
Chronic low moisture stress leading to scorch
Megan Kennelly, Kansas State University
Tip burn of needles
Jennifer Olson, Oklahoma State University
Excess moisture can lead to edema
www.ipm.iastate.edu https://www-s.aces.uiuc.edu/photolib/lib17//midsize/fruit_trees_-_po...
Soil compaction
E.L. Butler, North Carolina State University
Photos: http://www.ipm.iastate.edu/ipm/icm/node/565
http://www.landscaperesource.com/images/articles/soil_compaction_001.j...
Soil pH
• Some plants are very sensitive
– i.e. Blueberry & rhododendron prefer acid soil
• pH affects nutrient availabili...
Fertility
http://www.soils4teachers.org/files/images/s4t/reaction-curve.jpg
Nutrient Disorder Diagnosis
• Tricky to use symptoms alone
• Some problems you will see repeatedly
• Ask questions of the ...
Diagnosing nutrient disorders
• Symptoms
• Soil tests
• Foliar tissue analysis
• Greenhouse potted plants
– Pour through a...
Phytotoxicity-Herbicide injury
• Herbicides have different modes of action (MOA)
– can affect photosynthesis, root growth,...
Symptoms of herbicide injuries
• Depends on the ‘mode of action’
• http://herbicidesymptoms.ipm.ucanr.edu/index.c
fm
• Can...
Clopyralid and other pesticides in compost
http://ohioline.osu.edu/aex-fact/0714.html
Photo: Neil Bell, OSU Extension
Effect of clopyralid carry-over in compost
Glyphosate injury on cucumber (left) and healthy (right)
Characteristic glyphosate injury to tomato
Grapes are especially sensitive to 2,4-D
http://www.ppdl.purdue.edu/PPDL/images/herbicide-grape1.jpg
http://www.ppdl.purdu...
Continuum of damage
https://www.youtube.com/watch?v=OXca8ksXDlI&list=PLrQLElJHkjuh65RjQZ8nWDBh0Da_MekB0&index=4
Insecticides & Fungicides
• Review label!
• High temperatures
don’t mix with:
– Horticulture oils & sulfur
http://vegetabl...
Unusual growths or appearance
• Chimeras
• Burls
• Fasciation
Chimeras
Photo Source: https://ask.extension.org/uploads/question/images/attachments/000/012/285/Chimera_016_original.JPG?...
Fasciation
Handling a frustrating case
• Step back from the sample and look at the big picture
• Request more information:
– A fresh ...
Abiotic problems advanced training
Abiotic problems advanced training
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Abiotic problems advanced training

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Class #1 for Plant Diagnostic Master Gardener specialist training

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Abiotic problems advanced training

  1. 1. Master Gardener Plant Diagnostic Specialist Training Part 1: Abiotic Issues
  2. 2. What is Diagnostics? • Process used for the identification of problems • Tools –Plant sciences: horticulture, soil science, plant pathology and entomology –Art of investigation Photo: Toronto Public Library, Special Collections (CC BY-SA 2.0)
  3. 3. Categories of Abiotic Problems • Weather: temperature & rain/drought • Irrigation issues • Soil factors • Fertility • Chemical Injury • Mechanical Injury • Unusual growths/appearance
  4. 4. Be familiar with historic weather events Source: https://weatherspark.com/history/30206/2015/Eugene-Oregon-United-States
  5. 5. Winter Injury PNW Disease Management Handbook ->Pathogen Articles ->Nonpathogenic Phenomena ->Winter Injury of Landscape Plants in the Pacific Northwest
  6. 6. Low & High Temperature Damage • Some plants tolerate lower/higher temps • Acclimatization is important • Easily confused with chemical damage or root disease • Knowing plant’s history is important Photo: http://www.burpee.com/images/product/prod001210/prod001210_lg.jpg
  7. 7. Moisture extremes • Short-term or chronic effects Megan Kennelly, Kansas State University
  8. 8. Chronic low moisture stress leading to scorch Megan Kennelly, Kansas State University
  9. 9. Tip burn of needles Jennifer Olson, Oklahoma State University
  10. 10. Excess moisture can lead to edema www.ipm.iastate.edu https://www-s.aces.uiuc.edu/photolib/lib17//midsize/fruit_trees_-_poor_drainage.jpg Geranium Camellia Photo: M. Willliamson
  11. 11. Soil compaction E.L. Butler, North Carolina State University
  12. 12. Photos: http://www.ipm.iastate.edu/ipm/icm/node/565 http://www.landscaperesource.com/images/articles/soil_compaction_001.jpg
  13. 13. Soil pH • Some plants are very sensitive – i.e. Blueberry & rhododendron prefer acid soil • pH affects nutrient availability • Need to solve the ‘real’ problem
  14. 14. Fertility http://www.soils4teachers.org/files/images/s4t/reaction-curve.jpg
  15. 15. Nutrient Disorder Diagnosis • Tricky to use symptoms alone • Some problems you will see repeatedly • Ask questions of the client: – Fertilizer regime? – Soil conditions? – Watering regime?
  16. 16. Diagnosing nutrient disorders • Symptoms • Soil tests • Foliar tissue analysis • Greenhouse potted plants – Pour through analysis Photo: http://vegetablemdonline.ppath.cornell.edu/Images/Impt_Diseases/81_Pep_Bloss.jpg
  17. 17. Phytotoxicity-Herbicide injury • Herbicides have different modes of action (MOA) – can affect photosynthesis, root growth, shoot growth, and/or other aspects of plant growth • Contact – Shoots/foliage – Root contact • Systemic – Translocated damage (xylem and/or phloem) Good reference: http://msue.anr.msu.edu/uploads/files/6- 23%20Nursery%20grower%20checklist%20TOM%20herbicide %20injury.pdf
  18. 18. Symptoms of herbicide injuries • Depends on the ‘mode of action’ • http://herbicidesymptoms.ipm.ucanr.edu/index.c fm • Can search by herbicide and see symptoms on multiple species List of home use herbicides: • http://pnwhandbooks.org/weed/horticultural/ho me-garden-and-landscape-management/weed- treatments-and-available-products-home-lands
  19. 19. Clopyralid and other pesticides in compost http://ohioline.osu.edu/aex-fact/0714.html
  20. 20. Photo: Neil Bell, OSU Extension Effect of clopyralid carry-over in compost
  21. 21. Glyphosate injury on cucumber (left) and healthy (right)
  22. 22. Characteristic glyphosate injury to tomato
  23. 23. Grapes are especially sensitive to 2,4-D http://www.ppdl.purdue.edu/PPDL/images/herbicide-grape1.jpg http://www.ppdl.purdue.edu/PPDL/images/herbicide-grape3.jpg
  24. 24. Continuum of damage https://www.youtube.com/watch?v=OXca8ksXDlI&list=PLrQLElJHkjuh65RjQZ8nWDBh0Da_MekB0&index=4
  25. 25. Insecticides & Fungicides • Review label! • High temperatures don’t mix with: – Horticulture oils & sulfur http://vegetablemdonline.ppath.cornell.edu/Images/Tomato/Tom_Malathion/67_03.jpg http://extension.umd.edu/sites/default/files/_images/programs/hgic/Trees_Shrubs/EnvironmentalProblems/phyto_l2.JPG
  26. 26. Unusual growths or appearance • Chimeras • Burls • Fasciation
  27. 27. Chimeras Photo Source: https://ask.extension.org/uploads/question/images/attachments/000/012/285/Chimera_016_original.JPG?1365028081
  28. 28. Fasciation
  29. 29. Handling a frustrating case • Step back from the sample and look at the big picture • Request more information: – A fresh sample – A bigger sample – Photos • More than one problem may be involved • Symptoms can be affected by: – Environment – Plant genetics – Physiology – The pathogen or degree of abiotic stress Definitive diagnosis is not always possible

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