Noticed after a week a part of my Douglah that was close to the fense is curling and yellowing.The neighbour was using glyphosphate to kill some weeds near the fence. All though he asures me he was carefull, the yellow curles have me worried. Is it to late to cut back - or if it has been injured, has the poison gone through the whole plant by now (the rest of the plant seems ok for now - but I know this stuff does that ie you think it isnt working then bam - in few weeks the plant is dead).