This may sound like a silly question but I have noticed that Simazine is registered in the US for control of fall panicum as a pre em.

We have a grass problem every year in our corn that I cant control with Metolachlor, Pendemethalin or Atrazine and we have no post emergent herbicides available in Aus.

Our grass seems to be a panicum type species that grows rapidly has fine hairs on its leaves and puts out a seed head that when matures, rolls away with the wind and spreads more seed, oh, and it seems to laugh at Atrazine as a post em.

No one over here can tell me why Simazine isn't registered or if it will damage my corn. Do you think it will control this grass? and can it damage the corn?

Also can any one think of other options I may have in conventional corn. think old school, say 30yrs ago! Linuron, Bladex etc.

I can use droppers if I have to.

Thanks for your help,

Jim