of material from which the structure illustrated in fig1 is formed i e a synthetic resinous material having the insect killing medicament impregnated therein or carried thereby or a metallic strip of the type illustrated in fig2 and adapted to receive the insect killing medicament in the form of spheres 17 spaced about the circumference of the endless ring formed by the strip 12 in the interest of clarity only one such sphere 17 is illustrated in this embodiment it will of course be understood that additional such spheres may be incorporated within the endless ring referring to fig4 and 6 these illustrations indicate that the cross sectional configurations of the coils 7 may be circular as illustrated in fig4 and the insect killing medicament may be formed in a sphere as illustrated in fig2 while in fig5 the cross sectional configuration of the coils 7 39 are configured to present a generally rectangular configuration as illustrated and the body of medicament 18 may constitute an elongated flat strap formed from an appropriate synthetic resinous material impregnated with the appropriate insect killing medicament as illustrated in fig5 the elongated strap 18 has a generally rectangular cross section while longitudinally the strap 18 is.