Here are a few observations and comments on annual ryegrass burndown this year:

1. ARG plants need to be actively growing for at least a week to ensure all plants are indeed actively growing
2. To kill the annual ryegrass, I always recommend 1.25 lbs a.i./a of glyphosate
3. Always recommend at least 1 pt 2,4-D
4. Adding Basis , Sharpen or Canopy with the glyphosate worked well this year (some fields initially had about 95% kill with this combination  but after additional 5-7 days all annual ryegrass plants were dead). This also provide multiple modes of action. More work on timing and rates is needed.
5. Adding atrazine or Callisto to the glyphosate (especially with cool conditions) will result in poor control of the annual ryegrass
6. In a normal spring with cool temperatures  glyphosate doesn’t translocate well, so, the following is  recommended:
   1. Reduce carrier to 8-12 gal/ac
   2. Use AMS and also lower water pH to 4.5 to 5.5
   3. Spray on a sunny day if possible
   4. Stop spraying mid afternoon so that there is at least 5 hours of sunlight.

Yes, growers using annual ryegrass as a cover crop also have some additional management details to learn.  But it seems once they understand and believe these recommendations, then most of their problems also go away.

I have seen much lower broadleaf pressure on fields where growers are using cereal rye and annual ryegrass.  I have also observed these cover crops eliminating marestail (includging RR resistant marestail).