What factors cause insecticidal resistance?
Insecticidal resistance is caused by repetitive use of one chemical class of insecticide, under-dosing, or if the fly tags have not been removed after the efficacy claim period.
How does insecticide resistance happen?
Insecticidal resistance happens when the insect's genetic makeup changes.
When the chemical dose becomes sub-lethal (due to the factors listed above) individual insects survive the chemical application. As succeeding generations are exposed to the insecticide, the number of resistant individuals increases.
How quickly does insecticidal resistance occur?
Buffalo fly have short life spans and reproduce quickly, which means resistance can develop rapidly.
What strategies are available to combat insecticidal resistance?
What is a fly tag management program?
An fly tag management program is a wider plan to help you combat flies and other pests.
We recommend the following;
- tagging all the animals in a mob
- applying the recommended number of tags to each animal
- removing the tags at the end of the efficacy period
- adopting the fly tag rotation strategy
- synchronising your insecticide applications with your neighbours
What is a fly tag rotation strategy?
It is recommended to alternate insecticidal ear tags with different chemical compounds to prevent over-exposure of a single chemical in the target insects. There is little or no cross-resistance between the major chemical classes.
Therefore fly tags containing three different insecticides are used in the rotation.