The ends of many, but not all, of the branches of my forsythia bushes are...
The ends of many, but not all, of the branches of my forsythia bushes are drooping and the leaves at these ends are wilting badly. Is this due to a disease? What should I do about it?
It could be Sclerotinia. It could also be herbicide damage. We cannot say for sure from your description. Whatever it is, get the affected portions cut out. Wipe your clipper blades with alcohol between cuts. To maintain the open appearance of the forsythia you can make your cuts close to soil level. Forsythia is quite hardy and should recover, even if you have to cut it all back to soil level. vw