Ouch! Vegetable plants poisoned in Australia

Authorities are still trying to determine if the poisoning of millions of seedlings at a nursery in Northern Queensland is vandalism, a grudge, or cut-throat competition.
This is the time in 8 years that such an act has been accomplished.
The price of vegetables (especially tomatoes) is expected to climb as the supplier provided plants to ~ 30 growers and ships plants to other countries in the area.
Many seedlings had already been planted, adding to the cost.
Damage is estimated to be about $20M so far.
I wonder if this has happened in the US and the authorities were smart enough to keep it quiet to avoid copycats.