Field Evaluations of Dow ET-57 as a Systemic Insecticide for the Control of the Common Cattle Grub in Alabama1

Abstract

Experiments for the systemic control of cattle grubs, Hypoderma lineatum were conducted at 4 locations in Alabama in 1956. Some of the cattle were treated with boluses and some with drench. The following are percentages of control of grubs in cows that were treated with boluses: Prattville, 80; Camden, 96; Marion Junction, 97; and Camp Hill, 94; average 87%. Seventy-seven % of the animals treated with boluses and 22% of the untreated animals were free of grubs at the completion of the tests. Cattle grub control based on number of grub-infested animals was 70% where Dow ET-57 was administered as boluses. In the cattle that were treated with drench, the percentages of control of grubs at Camden was 79 and at Marion Junction 90; average 86%. Seventy-six % of the animals that were drenched and 36% of the untreated animals at these 2 locations were free of grubs at the completion of the tests. Control based on number of grub-infested cattle averaged 63% in these 2 areas. There was no apparent difference in the effectiveness of the bolus and drench treatments; however, the boluses were easier and safer to administer.