Q.Shot Hole Fungus
Looks like pictures of Shot Hole Fungus on my Knockout Rose. First tried the baking soda and water treatment then purchased a mildew product. It got worse and now almost all leaves have the holes or some small white streaks. Should I cut the bush back since there is so much damage and hope it will try to recover these next few warm months we have in Tennessee? Thanks for any suggestions. Never did have the Green Thumb!! 🙁
If shot hole disease is affecting your plant, then you may not have any other choice but to cut off all the infected growth and disposing of it (as well as any fallen debris). Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/shot-hole-disease-fungus.htm