Effect of Spray and Paint-On Applications of a Slow-Release Formulation of Chlorpyrifos on German Cockroach Control and Human Exposure12

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Abstract
Twenty housing units were treated with a slow-release formulation (Killmaster II®) of 2% AI chlorpyrifos by either a paint-on or a spray application method. Populations of Blattella germanica (L.) were monitored with ‘sticky’ traps before and after treatment. There was no significant difference in efficacy of insecticide between the two application methods. The paint-on application required less chemical per unit and more time than did the spray application method. Dermal exposure was significantly greater for the spray than for the paint-on application method (P ≤ 0.10. The air concentration of chlorpyrifos in the breathing zone of applicator was significantly (P ≤ 0.10) higher for the sprays than for the paint-on applications. There was no measurable effect as a result of the application method on the amount of chlorpyrifos absorbed gauze pads placed on the kitchen floor, table, and appliances of the housing units.

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