Western Australia's Pastoralists and Graziers Association is calling for an aerial cull of feral horses on two Aboriginal pastoral leases in the Kimberley, near the Northern Territory border.
The association estimates horse numbers at the Lake Gregory and Billiluna stations to be as high as 9000.
Former Kimberley pastoralist Jim Motter says it's time something was done about these horses before any more damage is done to the environment.
"If you're overstocked, the environmental things come in straight away because the country gets flogged out".
There are 519 pastoral leases in WA, covering nearly 90 million hectares or 36% of the state.
One function of the statutory authority, the Pastoral Lands Board (PLB), is to monitor the numbers and the effect of stock and feral animals on pastoral land.
"The PLB directed the lessee to remove the horses from the leases and the lessee has not yet done that," board chair Leanne Corker said.
She said that directive was given at least three years ago.
"The lessee is now in default of the Pastoral Lands Board."
"It's quite possible that if the lessee remains in default their lease may not be reviewed in 2015 because they'll be non-compliant."
