Small-Scale Field Tests in Texas with Six Systemic Insecticides for the Control of Cattle Grubs

Publisher Website
Google Scholar
Abstract
Groups of 12 to 46 cattle on seven ranches near Spur in north Texas and Kerrville in southwestern Texas were treated. One spraying with 0.25% General Chemical 4072 (2-chloro-1-(2,4-dichlorophenyl)vinyl diethyl phosphate) and two sprayings separated by 2 months were 67% and 81% effective in preventing encystment of common cattle grubs (Hypoderma linea tum (deVillers)). Bayer 37342(O,O-dimethyl O-4-(methylthio)-3,5-xylyl phosphorothioate) afforded 99% control as a 0.5% spray, but only 38% or 58% control as a 2% pour-on in oil or water at 6 oz. per heard. A pour-on of 6 oz. per head of 8% Dipterex® (dimethyl 2,2,2-triehloro-1-hydroxyethylphosphonate) in oil was only 70% effective. Famophos® (O-p-(dimethylsulfamoyl)phenyl O,O-dimethyl phosphorothioate) afforded 94% control when calves were each injected intramuscularly with dosages of approximately 15 mg./kg. Bayer 29493 (O,O-dimethyl O-[4-(methylthio)-m-tolyl] phosphorothioate) was 98% effective when applied as a pour-on of 1% in oil at 6 oz. per head. A dip of O.5% Ruelene® (O-4-tert-buty1-2-chlorophenyl O-methyl methylphosphoramidate) afforded 100% control, and 0.25% afforded 86% control.

This publication has 2 references indexed in Scilit: