Previous work showed that transfluthrin freestanding passive emanators (FTPEs) used under simulated outdoor conditions could significantly reduce the human landing rate of Ae. aegypti [29]. This device is a stool-like structure that supports hessian strips (made from plants of the species Corchorus olitorius or C. capsularis, also called jute, burlap or gunnysacks) (Fig. d). The hessian strips were made from hessian sacks purchased locally, washed using well water and powder detergent (OMO®, Unilever, Nairobi, Kenya) and dried under direct sunlight. They were then cut into strips measuring 5 m × 10 cm and treated with 5.25 g of transfluthrin emulsified concentrate (EC; Bayothrin EC, Bayer AG, Monheim am Rhein, Germany). Two FTPEs with a total of 10.50 g (5.25 g each) of transfluthrin were used per experiment.
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