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Pest Management Concepts

Pest Management Concepts. What is a pest?. Could be an animal or plant Anything out of place Causes nuisance Is a public health threat Causes economic loss Causes aesthetic loss. What is a pesticide?. It is an all inclusive term Includes all chemicals used to control pests

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Pest Management Concepts

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  1. Pest Management Concepts

  2. What is a pest? • Could be an animal or plant • Anything out of place • Causes nuisance • Is a public health threat • Causes economic loss • Causes aesthetic loss

  3. What is a pesticide? • It is an all inclusive term • Includes all chemicals used to control pests • cide, means “to kill” or “killer”

  4. Definition of a pesticide • Growth regulators • Desiccants • Repellents • Attractants • Sterilants

  5. A pesticide • Affects growth • Affects behavior • Reduces numbers • Eliminates organisms

  6. Pest control vs management • Control = eradication • Pesticide residues, pest resistance, nontarget effects • Management = Reducing numbers below acceptable levels • Establishment of thresholds, sampling, use of multiple tactics, and need-based pesticide applications

  7. Injury vs damage • Injury – inflicted by pest and its activities • Damage – measured loss of host utility (yield, quality, and quantity)

  8. Gain threshold • Gain threshold = • management cost ($)/market value ($) • Ex: For corn, insecticide application costs $10/acre and the harvested corn is marketed at $2/bushel; gain threshold = • 5 bushels/acre.

  9. Damage boundary • Lowest level of injury where damage can be measured

  10. Economic-Injury Level (EIL) • Lowest number of pests that will cause economic damage • Loss due to pests = gain threshold • Injury is translated into pest numbers

  11. Economic Threshold (ET) • Is widely used for making pest management decisions • Also called as action threshold • The pest density or intensity that should trigger management actions

  12. ET • It is a complex value (fixed vs descriptive) • It is based on pest population dynamics • ET = EIL if population growth cannot be predicted • It is lower than EIL • Allows time to react or take action

  13. Insect Equivalents (IE) • If several pests cause similar damage then instead of insect numbers, insect equivalent can be calculated. • IE = amount of injury that could be produced by pest through its complete life cycle

  14. EIL Example • If gain threshold is 5 bushels per acre and 1 insect/plant causes 1 bushel/acre loss then EIL is = 5 insects/plant.

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