What is insecticidal resistance?

What is insecticide resistance?

Insecticide resistance is defined by the Insecticide Resistance Action Committee {IRAC} as a heritable change in the reduced sensitivity of a pest population to an applied product when used according to label recommendations. For Buffalo Fly resistance to a particular chemical group to occur it is usually caused by the Buffalo  Fly being exposed to a sub lethal dose of insecticide.

  • 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?

    It is recommended to use an ear tag management program that includes a rotation strategy

  • 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.

What is a Buffalo Fly?

The blood-sucking Buffalo Fly can cause severe irritation in cattle affecting weight gain, milk production and hide value.

The Y-Tex Insecticidal Ear Tag Strategy

An insecticidal ear tag rotation strategy is important to prevent flies becoming resistant to commonly used insecticides.

The economic benefits of Buffalo Fly control

Implementing a long-term fly control strategy has many positive economic benefits.