Foxtail and Pre-emergent

Is foxtail an annual - not a perennial?  I've read it is an annual, but for some reason thought otherwise?

 

Being an annual - I gather, if there are seeds, it grows - goes to seed again and you've got another batch for next year.

 

Spray herbicides and forget about planting seeds, i.e. overseed an existing field?  I think we've discussed that in addition to broad leaf killing, many herbicides are also pre-emergents.

 

It would seem to me that if foxtail is an annual and depends on a new batch of seed to continue on, then timely application of herbicide could be an effective measure to control it?

 

Am I really WAY of the mark with the above?

 

Thanks!

Bill

Foxtail and Pre-emergent