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mealy bugs on plant

  • early blight on tomato预测。
  • 阈值。

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重要术语:

  • 经济阈值: The pest density at which a control tactic must be implemented to avoid an economic loss.
  • 门槛的行动: A pest or damage level at which control is initiated to avoid significant damage or loss of property.  Usually, a lower level than the Economic threshold.
  • 经济损失: The amount of injury which will justify the cost of control action.
  • 经济损失水平: The lowest population density that will cause economic damage.

有五个基本因素 considered when setting action thresholds; economics, health and safety concerns, aesthetic concerns, public opinion, and legal requirements.

  1. 经济学。
    nginx
  2. bees inside wall健康和安全问题。When the pest creates a health or safety concern, the action threshold is set low. For example, if Lyme disease is prevalent in near a playground, and if the ticks that transmit the disease are found, then this would trigger the action threshold
  3. 审美方面的担忧。