How to avoid insecticide resistance

Flies are continually developing resistance to the chemicals used in preventative products. To slow down resistance:

• alternate chemical groups (known as 'families'), especially if you're applying a preventative product twice in a season;

• when treating an active flystrike case, use a chemical that's a different family to the one you used to try and prevent it;

• if you use a chemical in winter to prevent lice, make sure it's a different chemical family to the one you use in summer for flystrike;

• make sure you're using effective chemicals – check with your vet.