sprayed 300 acres 3 weeks ago with 3 pint flexstar gt and 44 ounces powermax thought we killed em but not so. there back to green as ever now and this was at 20 gpa. not sure what to do now. did 50 acres 5 days ago with 12 oz of cobra and .5 oz of classic with crop oil now the weeds are dead beans look rough to but hopefully they can come out of it.. starting to think going back to old school chem none of the pre worked here.