Spiders, Lizards, Silver Fish etc. are pests that thrive around human dwellings. Unclean conditions increase their numbers. These insects, because of their dependence on man for food, will still exist in the best and cleanest of premises. These insects are repulsive, cause diseases by carrying germs on their body and contaminate food. They also interfere with personal comfort and can cause social embarrassment. Personal efforts at eliminating these pests are ineffective and time consuming.