Pest control techniques, monitoring

Monitoring the population densities of endemic pests with pheromone traps has been done successfully for decades against scores of species worldwide. When pheromone traps are used for monitoring, they are widely spaced and are at such a low density that they have no effect on reducing population density by themselves. They only serve as sentinels to trigger, at some threshold capture level, the application of other pest control techniques such as insecticide sprays against larvae at some later date that is often based on accumulated thermal units (Baker 2008). 

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