Feedworks provides leading edge nutritional and functional feed additives for the poultry industry. Given we have a freedom of choice we only work with those products that meet our internal review process. All products meet AgVet regulations audited to industry codes of practice.


The fly control agent which is applied by the birds themselves!

  • Larvadex® is given as a feed additive and is deposited in the dung of birds.
  • This method of application means Larvadex® is always present in the most effective concentrations.
  • Where there is more dung, so there is more Larvadex®.

Unique chemical

  • Larvadex® contains cyromazine, an insect growth regulator which attacks the larval stage of fly development. No cross-resistance!
  • Cyromazine belongs to a chemical group that is not linked to any currently available residual or “adult knockdown” fly control product. It therefore controls multi-resistant flies and is not affected by cross-resistance.

Mode of action

  • Cyromazine is a larvicide. It prevents the normal development of larvae into pupae.
  • It has no direct effect against adult flies.

Use with adulticides

  • Larvadex® should therefore be used in conjunction with adulticides such as Agita® which are stomach poisons with quick “knockdown” properties against adult flies.

Spectrum of control

  • Larvadex® controls all those fly species which pose an economic threat to farmers involved in intensive animal production.

The benefits of using Larvadex

  • Easy and convenient
  • Quick acting
  • Safe and reliable
  • Saves time
  • Saves labour