That is disheartening. One of my Ison muscadine vines suffered last spring from 2,4,- D drift, but when I thought all was gone, I cut it to the ground. Much to my delight, it decided to grow back. I also lost a nice 4 year old plum tree. Regarding 2 4 D this is a lesson I learned the hard way, a light breeze is all it takes, so if possible do not let this herbicide near your plants. I have no idea what the crop duster is spraying over the cotton and peanut fields next to my home.