The following charts show features, clearances and
effectiveness of a variety of insecticide ear tags.
Each tag listed in the charts will provide up to
5 months effectiveness against horn flies and most
other pests as shown under "Clearances and Effectiveness"
when attached two per animal (one per ear)
with the exception of the Y-TEX PYthon MAGNUM tags
which are recommended at no more than
one tag per animal and effective up to 4-5 months.
C-Control(blue), AC-Aids in Control(yellow), NC-No Control
Use on Calves - We often get questions about using the insecticide tags on calves.
The most common guideline is that Calves should be 3 months or older unless specified on package label.
Other recommendations that we have been given are that if the calf is nursing, they should be able to get the protection they need from the cow and thus we recommend that you provide effective fly control by tagging the cows.
If the calf is not still nursing, then it is recommended to use a single insecticide tag per calf in the 9 gram weight range rather than the heavier tags - especially for younger/smaller calves.
Insecticide Tag Rotation - For best results when using insecticide tags, it is recommended that you rotate among the chemical classes of tags yearly to reduce fly resistance to any one chemical class.