I tryed this from Bishop CA, but it didn't get transferred here. So I'll try to get it Redondo. When you spray round up, the time allotted for planting is usually 10 days after. So if this was sprayed in March there would not of been any fruit developed on the vine or very little after flowering. This is August when they had the picking of the grapes so there should not be any residue left from the spraying of the railroad property. Something sounds fishy.