I sure need some help and expert eyes and advice. This picture shows what has been happening to my bushes over the past few years. One bush at at time will start looking like this picture. Then the leaves will fall of that area only of the bush. Just bare sticks will be left in that area, and the rest of the bush will be fine...for a while. It will continue to spread, and in a year, that bush will be dead. I have probably 20 bushes in a line, and it may hit a bush at this end one time, or further down the line next time, etc. All the other bushes stay fine and healthy. It will start with a look like in this picture, and it will look like this only in one area, and everything else around this area will be pretty and green. The area shown in the picture is about a foot in diameter. These bushes are probably around 20 years old, and are cut back to about 2 ft high. I have the ground fabric around them with mulch on top of that. There seems to be no rhyme or reason to which bush will get struck next.
I have tried Seven dust, Triple Action, and some others, but the results were so subtle, if at all, that I can't tell if anything really worked or not. I have more pictures if requested.
Can anybody put their finger on the problem? I live in North Mississppi.