Control of larvae of the common cattle grub (Diptera: Oestridae) with animal systemic insecticides [Hypoderma lineatum]

Small groups of government-owned cattle were given titrated dosages of labeled animal systemic insecticides suggested for systemic control of larvae of the common cattle grub, Hypoderma lineatum . Of 10 treatments suggested for control of cattle grubs, the label-listed dosages of coumaphos spray, crufomate pouron (EC diluted with water or 12% ready to use), fenthion pouron, phosmet spray or pouron, and trichlorfon pouron exceeded the calculated LD sub(90). Also, the highest level of the label-listed dosage of fenthion Spotton, but not the minimum level, exceeded the calculated LD sub(90).