In IPM, the action threshold is the:
- Highest rate permitted by the label
- Pest level at which control is justified
- Number of sprays allowed in a season
- Point where the pest has been eliminated
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B. Pest level at which control is justified
The action threshold is the pest density or damage level at which treatment is needed to prevent unacceptable injury or loss. Below it, monitoring continues without treatment.
Reference: Integrated pest management for landscapes and structures
In ornamental landscapes, treatment thresholds are usually lower than in farm crops because they are based on:
- Appearance of the plants (aesthetic injury)
- The yield of the plants at harvest
- The market price of the pesticide used
- The number of beneficial insects present on site
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A. Appearance of the plants (aesthetic injury)
Landscape plants are valued for their looks, so the threshold is the level of pest damage the client will tolerate, an aesthetic threshold. Farm thresholds are based on economic loss of yield.
Reference: Integrated pest management for landscapes and structures
Mice are reported in a school kitchen. Under an IPM policy, the best first response is to:
- Broadcast loose rodenticide pellets around the dry storeroom
- Fog the kitchen with insecticide over the weekend
- Wait until the mice are seen during the daytime
- Inspect, seal entry points, fix sanitation and set traps
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D. Inspect, seal entry points, fix sanitation and set traps
IPM in sensitive sites starts with inspection, exclusion, sanitation and traps, which solve the cause with no chemical exposure. Loose bait near food and children is hazardous and violates rodenticide labels.
Reference: Integrated pest management for landscapes and structures