some of the leaves on my knock out rose bush are turning yellow. why?
Some of the Leaves on My Knock Out Rose Are Turning Yellow …Why?
You could have larvae from the sawfly. They eat the membranes on the undersides of the knock out bush and that is why the color fades. Buy some neem oil and mix as directed but also add drops of dawn to the mixture so the oil and water will combine better. Add the soap til you don't have the oil floating on top of the water. Spray leaves down with a hose first. Then let dry and spray all the leaves top and bottom with the neem oil after the sun sets as to not burn the plant. Good luck!