Table 1 Time to knockdown (in minutes) for 50% of Anopheles mosquitoes in the Gondar Zuria district after one hour of insecticide exposure.

Alphacypermethrin

120

Exposed

80

–

Control

40

–

Permethrin

120

Exposed

80

40

(37–45)

Control

40

–

Deltamethrin

120

Exposed

80

40

(37–45)

Control

40

–

Pirimiphos-methyl

120

Exposed

80

–

Control

40

–

Propoxur

120

Exposed

80

37

(35–39.8)

Control

40

–