Boophilus annulatus and B. microplus: sprays and dips of insecticides for control on cattle.

Abstract

Of 25 insecticides sprayed onto cattle for control of Boophilus annulatus (Say), the cattle tick, or B. microplus (Canestrini), the southern cattle tick, the following afforded > 99% control of either or both species: 0.1% Allied Chemical ACD-10284 ( O, O diethyl phosphorodithioate S -ester with N -(2-cyanoethyl)-2-mercaptoacetanilide); 0.05% Bay 64995 ( O, O -dimethyl phosphorothioate O, O -diester with 4,4-dithiodiphenol); 0.1% bromophosethyl; 0.025% chlorpyrifos; 0.125% Ciba C-9491 ( O -(2.5-dichloro-4-iodophenyl) O, O -dimethyl phosphorothioate); 0.075% crotoxyphos; 0.025% diazinon; 0.05% dioxathion; 0.05% fenthion; 0.03% Imidan® ( O, O -dimethyl phosphorodithioate S-ester with N -(mercaptomethyl) phthalimide) ; 0.005% isobenzan; 0.5% malathion; 0.1% monocrotophos; 0.5% ronnel; 0.25% Shell SD-8447 (2-chloro-l-(2,4,5-tri-chlorophenyl) vinyl dimethyl phosphate); 0.1% Shell SD-8949 (1-(2-bromo-4,5-dichlorophenyl)-2-chlorovinyl dimethyl phosphate); 0.1% Shell SD-8988 (2-bromo-l-(2,4-dichlorophenyl) vinyl dimethyl phosphate); 0.5% toxaphene; and 0.5% trichlorfon. A solubilized formulation (I part technical material:2 parts Triton® X-100) was as effective as an emulsifiable concentrate of Compound 4072 (2-chloro-l-(2,4-dichlorophenyl) vinyl diethyl phosphate). Fresh and aged (21 weeks) dips of 0.073–0.164% dioxathion and fresh and aged (51 weeks) dips of 0.010–0.049% chlorpyrifos also afforded > 99% control. In addition, a dip of 0.05–0.25% Shell SD-8447 was highly effective, but the chemical analysis of the dip fluids was unsatisfactory.