Grubs damage muscle tissue along the back line of cattle and cut holes in the hide to breathe. The results of their handiwork are not apparent until February, but now is the time to apply the preventive treatment that will keep them under control.
Kentucky cattle should be treated for grubs between July 31 and October 15. During this period, the grubs are very small and vulnerable. Complications can occur if treatments are applied after the cut-off date, when the migrating grubs are in esophagus or near the spinal cord.
Use care when treating for cattle grubs. Accurate animal weights allow economical and effective treatment. Over-dosing wastes money and may cause animal stress, while under-dosing may result in unsatisfactory control.
By Lee Townsend, Extension Entomologist