very mature burning bushes are showing 2 issues with entire new branches dying, leaves completely dried but still intact to the branch. On most branches the leaves start out turning an orangish/yellow color. One branch the leaves turned bright yellow with green veins. I pruned back, using bleach solution to the blade betw each cut. Is this blight? 2 issues maybe? Thanks for all input. Nancy I tried to attach pictures but they aren't showing. ??