Diatomaceous earth is a fine fossil-shell powder dusted through poultry housing, nest boxes and dust-bathing areas. It works mechanically rather than chemically, which is why it has no withholding period — but it also only works while it is dry, so it needs redoing after rain or a wash-out.
Supplied in 1kg and 3kg bags. Shell grit and other poultry lines are in the Green Valley range.
Key points
- Works dry only — reapply after wet weather or cleaning
- Mechanical action — no withholding period on eggs
- Wear a dust mask — it is a fine powder and unpleasant to breathe

