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Characteristics of Pesticides

Characteristics of Pesticides. Basic concepts relating to the names, chemistry, behavior and fate of Pesticides including a review of the R8 Label Book summary pages. Pesticide Names. Chemical name *. There are three names associated with every pesticide. Common name *. Product name *.

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Characteristics of Pesticides

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  1. Characteristics of Pesticides Basic concepts relating to the names, chemistry, behavior and fate of Pesticides including a review of the R8 Label Book summary pages

  2. Pesticide Names Chemical name * There are three names associated with every pesticide Common name * Product name * Skip definitions

  3. Pesticide Names: Chemical Name The systematic Name of a Chemical Compound according to the rules of nomenclature of the International Union of Pure and Applied Chemistry as adapted for indexing in Chemical Abstracts For example: 3,5,6-trichloro-2-pyridinyloxyacetic acid.. is a chemical name Return

  4. Pesticide Names: Common Name A generic name for a chemical compound (see the Weed Science Society of America list of herbicide nomenclature) For example: The common name for 3,5,6-trichloro-2-pyridinoxyacetic acid.. is triclopyr The common name is the name generally used in discussing pesticidal toxicology and environmental behavior and fate Return

  5. Pesticide Names: Product Name The trade name of a pesticide; that is the name on the container you purchase. It is also the name to which the EPA registration number is applied at the time of registration Triclopyr alone is sold as: Garlon 3A or Garlon 4

  6. Names in the R8 Label Book Summary Sheets • Common names • Brand names • (If the chemical name is needed – see the label not the summary sheet)

  7. Another Caution ---Pronunciation of Names FORAY 4-AA PHORATE

  8. Some quick definitions Solution * Suspension * - Emulsion * - Invert Emulsion * Bypass definitions

  9. Some quick definitions Solution A liquid or solid chemical which is dispersed completely (not suspended) in water or another fluid. For our purposes this includes water solutions and ester or other oil-soluble chemical dissolved in oil Return

  10. Some quick definitions Suspension Finely divided solid particles or liquid droplets dispersed (but not dissolved) in another solid, a liquid or a gas. Return

  11. Some quick definitions Emulsion A suspension of small droplets of an oil-based or an ester pesticide in water Return

  12. Some quick definitions Invert Emulsion A suspension of small droplets of water in an oil. Some chemicals are now produced as invert emulsions

  13. Some quick definitions Invert Emulsion Generally the formation of an invert emulsions is undesirable. Without special precautions during mixing and use they commonly form resulting, in a sludge of the approximate consistency of mayonnaise that clogs hoses and nozzles and creates a major problem of clean-up

  14. Some quick definitions Solution Suspension Emulsion Invert emulsion Mixed – can separate Dissolved –Does not separate Oil droplets in water Water droplets in oil

  15. Liquids Solutions Emulsifiable concentrates Ultra Low Volume Concentrates Low Volume Concentrates Aerosols Liquified gas Solids Dusts Granules Pellets Soluble Powders Wettable Powders Flowables Baits Types of Product Formulation

  16. Gross Classification of Pesticides by Chemistry • Inorganic pesticides * • Organic pesticides * • Biological pesticides * Skip definitions

  17. Gross Classification of Pesticides by Chemistry • Inorganics • Molecules do not contain carbon • Heavy metals – lead and arsenic • Copper products • Sulfur products Return

  18. Gross Classification of Pesticides by Chemistry • Organics • Molecules contain carbon • May be chains or rings Return

  19. Gross Classification of Pesticides by Chemistry • Biologicals • Viruses, bacteria, fungi, and plants • Nematodes, insects and other parasites or predators

  20. Classification of Organic Herbicides by Chemistry • Phenoxy herbicides * • Triazines * • Imidazolinone * • Sulfonylureas * Bypass details

  21. Classification of Organic Herbicides by Chemistry • Phenoxy herbicides • 2,4-D, 2,4-DP, 2,4,5-T • Behaves as an auxin causing hypertrophy • Sample structure Return

  22. Classification of Organic Herbicides by Chemistry • Triazines • Hexazinone • Have extreme soil mobility • Structure Return

  23. Classification of Organic Herbicides by Chemistry • Imidazolinone • Imazapyr • Structure Return

  24. Classification of Organic Herbicides by Chemistry • Sulfonylureas • Metsulfuron & sulfometuron methyl • Sample structure

  25. Classification of Organic Insecticides by Chemistry • Chlorinated hydrocarbons * • Organophosphates * • Carbamates * Skip definitions

  26. Classification of Organic Insecticides by Chemistry • Chlorinated hydrocarbons • Dieldrin, aldrin, DDT, mirex, chlordane • Sample structure Return

  27. Classification of Organic Insecticides by Chemistry • Organophosphates • Malathion, azinphos-methyl, naled • Sample structure Return

  28. Classification of Organic Insecticides by Chemistry • Carbamates • Carbaryl (Sevin) • Structure

  29. 2 Basic Chemical Groups for Herbicides Amines * Esters * Skip details

  30. AmineGeneral Characteristics • Organic salt • Water soluble • Low volatility • Low in its toxicity to fish • Used for injection & cut-surface treatments Return

  31. Esters(General Characteristics) • Oil based • Oil soluble / can be emulsified in water • Generally highly volatile • Highly toxic to fish • Used for bark & foliar applications

  32. Organic salt Oil based Amine Ester • Water soluble • Oil soluble or can be emulsified in water • Low volatility • High volatility • Low toxicity for fish • High toxicity for fish • Bark or foliar applications • Injection & cut-surface treatments

  33. LD50s of field formulations Triclopyr – LD50 630 mg/kg Garlon 4 --LD50 1,419 mg/kg

  34. LD50s of field formulations Garlon 4 --LD50 1,419 mg/kg Streamline uses a 17% solution of Garlon 4 => 1,419 / 0.17 = 8,347 mg/kg Foliar spray is normally done as a 3% solution => 1,419 / 0.03 = 47,300 mg/kg

  35. Mode of action Selectivity Soil activity and mobility Persistence and breakdown Toxicity to humans and wildlife Application timing Weaknesses or limitations Environmental behavior: Several categories of environmental behavior are included in the summaries which precede each chemical presented in the Region-8 Label Book Information includes:

  36. The following slides discuss these and several other properties of pesticides in generalDiscussion in the “R-8 Label Book” section (later this week) presents chemical specific information

  37. Mode of Action: Herbicides • Movement in the plant • Contact * • Translocated * • Action in the plant • Inhibit protein synthesis, photosynthesis, or growth Bypass definitions

  38. Mode of Action: Contact Herbicide One which causes injury to only the plant tissue to which it is applied, or one which is not appreciably translocated within a plant Return

  39. Mode of Action: Translocated Herbicide One which is moved within a plant from the point of application to the point of action; may be either phloem-mobile or xylem-mobile The term is often misapplied to include only foliar applied herbicides which move downward from the leaves to the roots Return

  40. Mode of Action: Animal Poisons (incl. Insecticides) Contact poison * Systemic poison * Attractants * • Pheromones • Baits Repellants * Bypass definitions

  41. Mode of Action: Contact Insecticide Pesticide which causes injury or death of insect through the touch rather than through inhalation or ingestion Return

  42. Mode of Action: Systemic Insecticide Pesticide which is moved within a plant from the point of application to the point where the insect will contact or ingest it Return

  43. Mode of Action: Attractants Pesticide which lures animals to a predetermined spot • Pheromones are biochemicals either released by the animal or synthesized which are sex attractants • Baits are chemicals which entice animals for reasons other than sex (smells like food) Return

  44. Mode of Action: Repellants Pesticide which discourages animals from coming to a specific area • Many chemicals unrelated to sexual activity (due to smell or other physical characteristic) are repellant to animals • Pheromones in low concentration are attractive to animals but, often, in high concentration become repellant

  45. Mode of Action: Life Stage Affected Ovicide * Larvicide * Adulticide * Bypass Definitions

  46. Mode of Action: Life Stage Affected Ovicide • Kills eggs Return

  47. Mode of Action: Life Stage Affected Larvicide • Kills larval stage (immature) insects Return

  48. Mode of Action: Life Stage Affected Adulticide • Kills adult insects

  49. Mode of Action: Selectivity • Many products express a degree of selectivity • Extremely variable from product to product • Biologicals often more selective than chemicals • Despite claims, selectivity is generally limited • Often based on rate • Many newer products are more selective • Application method also influences selectivity

  50. Soil Activity Soil Active Herbicide: applied to or present in the soil, these chemicals are readily absorbed by plant roots and subsequently negatively affects the plant in some manner

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