The great dualism of so many arthropod species is that while they may live in our midst as completely benign entities most of the time, now and again they can't help but be in the wrong place at the wrong moment and are instantly transformed into undesirable aliens that must be controlled. A large part of their situation-specific pest status is due to the expectation of total indoor sterility that is endemic to Western societies and constitutes one of the primary confounding obstacles to the structural IPM paradigm.One of the most common manifestations of this rule is the reaction of so many building occupants to a small spider roaming on the wall or a lost wasp buzzing against the inside of a window-pane. A far cry from the epic suffering inflicted on humanity bymalaria mosquitoes or Chagas disease-infected conenose bugs, both spider and wasp are relatively innocuous to us in the great scheme ofthings, but typically provoke a substantial alarm reaction that ends in the unfortunate creature's demise.
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