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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.

Published in: Education, Business, Technology
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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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