Day

Untreated Control (n = 8)

Permethrin*

Fipronil**

Permethrin + Piperonyl Butoxide***

Mean (% Efficacy)

−8

61

53.4 (0)

54.8 (0)

59.5 (0)

0

41

50.7 (0)

50.7 (0)

52.8 (0)

3

57.3

0 (100)¥

0 (100)¥

0 (100)¥

7

44.6

0 (100)¥

0 (100)¥

0 (100)¥

14

49.2

0 (100)¥

0 (100)¥

0 (100)¥

21

37

0 (100)¥

0 (100)¥

0 (100)¥

28

62

0 (100)¥

0 (100)¥

0 (100)¥