A very thin film of dust is more effective than a thick layer. Holes that are the same size as the tip of a puff-type applicator can be drilled into the top of kick panels beneath cabinets and powder may be applied through the holes to these areas as well as under the sink, in the dead space between the sink and wall, and around utility pipes. Also treat along the back edges and in corners of shelves in cabinets, cupboards, pantries, and closets.
Sprays and Aerosols. Although sprays may provide a quick, temporary knockdown of cockroaches, they do not give long-term control. Sprays are often highly repellent to cockroaches and should not be applied to surfaces in areas where traps or bait stations are located.
Sprays may also disperse cockroaches to other areas of the building from which they could later return. Also, cockroaches have become resistant to many insecticides that formerly controlled them.
Sprays should not be necessary if an IPM program using sanitation, exclusion, and appropriate baits and dusts is practiced. However, in heavily infested structures, an initial application may be necessary to quickly reduce excessive numbers of the cockroaches while structural modifications are being initiated.
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