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Organic Pesticides
What works, what doesn’t, and why

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
Seminar recommendations
Based on current, peer-reviewed
science
Include materials certified as OMRI
Include materials regi...
Modes of action
Preventative*
Feeding
Egg laying
Spore and seed germination

Curative
Suffocation
Starvation
Disruption of...
Preventative - feeding
Odor
Essential oils
Neem

Taste
Garlic (lectin)
Neem
Pyrethrin

Touch
Horticultural oils
Kaolin
Dr....
Preventative –
egg laying & germination
Prevent insect egg laying
Horticultural oils
Kaolin

Prevent fungal spore germinat...
Curative - suffocation
Horticultural oils
Kaolin – fine particle clay
Diatomaceous earth – fine particle silica

Dr. Linda...
Horticultural oils
Includes those made from plants
(seeds, leaves, bark) and
petroleum
Most effective on soft bodied
insec...
Curative - starvation
Stomach poison
Bacillus thuringiensis (Bt)
Pyrethrins
Spinosad

Dr. Linda Chalker-Scott
WSU Extensio...
Ingestible insecticides
Includes Bt, neem, pyrethrins and spinosad
More targeted to pest species

Dr. Linda Chalker-Scott
...
Curative - disruption
Weed/weed seedling death
Maize gluten meal, vinegar

Insect cuticle abrasion
Diatomaceous earth, kao...
Pesticide realities
Pesticide registration does not include
product efficacy testing
Success in lab testing does not guara...
Maize gluten meal
High nitrogen byproduct of corn
milling
Registered herbicide
for turf

Dr. Linda Chalker-Scott
WSU Exten...
MGM effectiveness on crab grass control

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
MGM impact on crab grass root growth

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
Fungicides
Bacillus subtilus
Canola, corn, jojoba and sesame oils
Copper octanoate
Garlic oil
Kaolin
Potassium bicarbonate...
Herbicides
Cinnamon and lemongrass oils
Clove and eucalyptus oils
Herbicidal soap
Limonene
Maize gluten meal
Soybean oil
V...
Insecticides
Bt, nematodes and spinosad
Canola, cottonseed, mineral and sesame oils
Clove and mint oils
Diatomaceous earth...
Essential oils
Volatile oils (fragrant)
Work best in enclosed areas
Can be phytotoxic

Dr. Linda Chalker-Scott
WSU Extensi...
Essential oils for homeowner use
Insects/microbes:
cinnamon, clove, rosemary
and thyme mixture
Insects/microbes: neem oil
...
Popular mixed essential oil
products
“…blending extracts…does not ensure enhanced
biological activity.”
“…numerous plant-d...
Pesticide realities
All registered pesticides are tested to
determine toxic effects on people and on
ecosystems
Home remed...
Potential drawbacks –
big and small
Natural does not equal “safe”
Lead arsenate used as a pesticide until 1988
Nicotine an...
Potential drawbacks –
big and small
Broad spectrum pesticides can kill
beneficials, other non-target organisms
More freque...
Phytotoxic oils
Species-specific
Too much applied
Temperature too high
Test first!

Dr. Linda Chalker-Scott
WSU Extension ...
Potential drawbacks –
big and small
Any improperly used
pesticide can
contaminate the
environment
Any improperly used
pest...
PICOL database
http://cru66.cahe.wsu.edu/labels/Labels.php

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
Tips for creating naturally
healthy gardens and landscapes
Purchase disease-resistant plants
Select plants adapted to your...
Online information

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
Go back to college with the Garden Professors
http://blogs.extension.org/gardenprofessors/

Dr. Linda Chalker-Scott
WSU Ex...
Bert
Holly
Jeff
Linda

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
Visit us on Facebook!

www.facebook.com/TheGardenProfessors

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
Visit us on Facebook!
https://www.facebook.com/groups/20037544148

Dr. Linda Chalker-Scott
WSU Extension Urban Horticultur...
New WSU website for garden info
http://gardening.wsu.edu/

Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
Dr. Linda Chalker-Scott
WSU Extension Urban Horticulturist
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City of seattle organic pesticides

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A discussion of the science behind those organic pesticides listed for use by home gardeners only in Washington State.

Veröffentlicht in: Bildung, Business, Technologie
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City of seattle organic pesticides

  1. 1. Organic Pesticides What works, what doesn’t, and why Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  2. 2. Seminar recommendations Based on current, peer-reviewed science Include materials certified as OMRI Include materials registered *only* for home garden use in Washington state Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  3. 3. Modes of action Preventative* Feeding Egg laying Spore and seed germination Curative Suffocation Starvation Disruption of biochemical and/or physiological processes *must be able to predict Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  4. 4. Preventative - feeding Odor Essential oils Neem Taste Garlic (lectin) Neem Pyrethrin Touch Horticultural oils Kaolin Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  5. 5. Preventative – egg laying & germination Prevent insect egg laying Horticultural oils Kaolin Prevent fungal spore germination Bacillus subtilis Horticultural oils Kaolin Potassium bicarbonate Sulfur Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  6. 6. Curative - suffocation Horticultural oils Kaolin – fine particle clay Diatomaceous earth – fine particle silica Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  7. 7. Horticultural oils Includes those made from plants (seeds, leaves, bark) and petroleum Most effective on soft bodied insects May suppress disease Must apply before symptoms appear Can be phytotoxic Can injure beneficials Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  8. 8. Curative - starvation Stomach poison Bacillus thuringiensis (Bt) Pyrethrins Spinosad Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  9. 9. Ingestible insecticides Includes Bt, neem, pyrethrins and spinosad More targeted to pest species Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  10. 10. Curative - disruption Weed/weed seedling death Maize gluten meal, vinegar Insect cuticle abrasion Diatomaceous earth, kaolin, potassium laurate (soap) Insect growth and development interference Neem, nematodes (microscopic worms) Insect enzyme poisoning Copper octanoate Insect neurotoxin Pyrethrins, spinosad Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  11. 11. Pesticide realities Pesticide registration does not include product efficacy testing Success in lab testing does not guarantee success in the field Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  12. 12. Maize gluten meal High nitrogen byproduct of corn milling Registered herbicide for turf Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  13. 13. MGM effectiveness on crab grass control Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  14. 14. MGM impact on crab grass root growth Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  15. 15. Fungicides Bacillus subtilus Canola, corn, jojoba and sesame oils Copper octanoate Garlic oil Kaolin Potassium bicarbonate Sulfur Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  16. 16. Herbicides Cinnamon and lemongrass oils Clove and eucalyptus oils Herbicidal soap Limonene Maize gluten meal Soybean oil Vinegar (20% acetic acid) Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  17. 17. Insecticides Bt, nematodes and spinosad Canola, cottonseed, mineral and sesame oils Clove and mint oils Diatomaceous earth and kaolin Garlic oil Neem Nematodes Potassium laurate Pyrethrins Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  18. 18. Essential oils Volatile oils (fragrant) Work best in enclosed areas Can be phytotoxic Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  19. 19. Essential oils for homeowner use Insects/microbes: cinnamon, clove, rosemary and thyme mixture Insects/microbes: neem oil Ants: clove oil, mint oil Roaches: mint oil Deer: black pepper oil, garlic oil Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  20. 20. Popular mixed essential oil products “…blending extracts…does not ensure enhanced biological activity.” “…numerous plant-derived essential oil products…have not been subject to rigorous evaluation.” “Products vary in their effectiveness against certain arthropod pests…and are phytotoxic.” Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  21. 21. Pesticide realities All registered pesticides are tested to determine toxic effects on people and on ecosystems Home remedies and other unregistered pesticides can be harmful to people, pets and the environment Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  22. 22. Potential drawbacks – big and small Natural does not equal “safe” Lead arsenate used as a pesticide until 1988 Nicotine and rotenone used as insecticides until about 8 years ago Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  23. 23. Potential drawbacks – big and small Broad spectrum pesticides can kill beneficials, other non-target organisms More frequent application is often necessary with organic pesticides Some products phytotoxic Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  24. 24. Phytotoxic oils Species-specific Too much applied Temperature too high Test first! Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  25. 25. Potential drawbacks – big and small Any improperly used pesticide can contaminate the environment Any improperly used pesticide can create resistant pest populations Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist DDT resistant insects Roundup resistant weeds
  26. 26. PICOL database http://cru66.cahe.wsu.edu/labels/Labels.php Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  27. 27. Tips for creating naturally healthy gardens and landscapes Purchase disease-resistant plants Select plants adapted to your site conditions Keep plants happy – healthy plants are more resistant to pests and disease Increase your plant palette – a more biodiverse garden is more resistant to pests and disease Maintain good garden hygiene by removing infected plant tissues Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  28. 28. Online information Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  29. 29. Go back to college with the Garden Professors http://blogs.extension.org/gardenprofessors/ Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  30. 30. Bert Holly Jeff Linda Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  31. 31. Visit us on Facebook! www.facebook.com/TheGardenProfessors Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  32. 32. Visit us on Facebook! https://www.facebook.com/groups/20037544148 Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  33. 33. New WSU website for garden info http://gardening.wsu.edu/ Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist
  34. 34. Dr. Linda Chalker-Scott WSU Extension Urban Horticulturist

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