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Integrated management of German cockroaches in rental housing

This paper summarizes a study of an infestation of German cockroaches (Blatella germanica L.) in a high rise apartment building in Vancouver and discusses the possibility of developing an integrated pest management ( I P M ) program for their control. Eradication is not practicable, nor is it an appropriate objective for IPM programs and consequently tolerance levels need to be established. Most residents were able to tolerate seeing about one cockroach per week, particularly if it was not in their food or cooking utensils, or in their bedrooms. Many of the other residents could also be persuaded to accept this level of infestation. The suppression of cockroach populations should be approached first by modifying the habitat, and later by applying pesticides selectively. Surveys of the cockroach population must be carried out regularly in order t o assess the distribution and severity of the problem and to identify suites that need attention. Because areas that are kept too warm are often heavily infested, considerable benefit can be achieved by maintaining temperatures below 20 C. Clutter should be removed and cracks sealed to reduce harborage for the cockroaches. Proper containment of food will prevent contamination and along with increased sanitation will reduce the availability of food and harborage.