earlier in the Summer i wrote a reply to an inquiry about sand bur control and said i had used the herbicide Pastora by Dupont and had eradicated most of the sand burs in my pasture. unfortunatly the latent seed heads from the previous year sprouted a second sand bur crop. next year i'm going to spray early and do a second follow up about six to seven weeks later. in spite of the second crop the total sand bur growth is only @ 30% of the previous year, which makes me a believer in Pastora for sand bur control.