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Selecting Herbicide

Selecting Herbicide. Crop Science. Effective weed control depends on selecting the right herbicide. Herbicides are classified according to the way they destroy weeds. Types of Herbicide. Contact Herbicide Growth Regulators Soil Sterilants. Contact Herbicide. Kills plants by exposure

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Selecting Herbicide

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  1. Selecting Herbicide Crop Science

  2. Effective weed control depends on selecting the right herbicide.

  3. Herbicides are classified according to the way they destroy weeds.

  4. Types of Herbicide • Contact Herbicide • Growth Regulators • Soil Sterilants

  5. Contact Herbicide • Kills plants by exposure • Works best on Annuals • May only kill parts of the plant in contact

  6. Growth Regulator • Alters growth or metabolic processes • Absorbed by the roots, stems, or leaves

  7. The movement of a herbicide inside of a weed is known as translocation

  8. Soil Sterilant • Prevents the growth of plants in the soil • Most useful in greenhouse

  9. Selectivity of Herbicides

  10. Selective Herbicide • Kills only certain plant species and not others

  11. Selective Herbicide • Possible to spray in field without injuring crop

  12. Non-Selective Herbicide • Kills all plants regardless of species

  13. Non-Selective Herbicide • Should not be used in growing crops

  14. Using Herbicides Time of Application

  15. Herbicides may be applied at three times:

  16. Pre-plant • Pre-emergence • Post-emergence

  17. Using Herbicides Area of Application

  18. 4 general areas of application are used:

  19. Band • Treating narrow strips with herbicide • Used in cotton & corn

  20. Broadcast • Treating the entire area of a field • Used with pastures • Not used in row crop

  21. Directed Appl. • Treating only selected or targeted plants • Some use in row crop • Used a lot with trees

  22. Spot Application • Treating only certain areas in field • Saves cost plus labor • Protects environment

  23. Applying Herbicide • Knowing when and how to apply are important for effective weed control

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