Cattle biting louse: evaluation of compounds for juvenile hormone activity.

Twenty-one chemicals were evaluated for juvenile hormone activity against Bovicola bovis (L.) by incorporating the candidate materials in the diet of 3rd instars or by exposing eggs to vapors of the materials. A synthetic material (methyl 10,11-epoxy-7-ethyl-3,11-dimethy1-2,6-tridecadienoate, mixed cis/trans isomers) chemically eqnivalent to the juvenile hormone isolated from the male ccerotia moth, Platysamia cecropia (L), was used as the standard. Seven compounds had activity against the cattle biting louse comparable to that of the standard: ethyl 10,11-epoxy-3,7,10,11-tetramethy1-2,6-dodecadienoate; 4[(6,7-epoxy-3,7-dimethy1-2-nonenyl) oxyl-1,2-(methylenedioxy) benzene; cthyl ( E )-3,7,11-trimethy1-2-dodeccnoatc; ( E )-4-[(7-cth1-3,7-dimethy1-2-octenyl) oxyl-1,2-(methylcnedioxy) benzene; ethyl 11-chloro-3,7,11-trimethy1-2-dodecenoate; cthyl 3,7,11-trimethy1-2,4-dodecadicnoate; isopropyl 11-methoxy-3,7,11-trimethy1-2,4-dodecadienoate.