Q.part of the tree dying
my eucalyptus tree [established] has gone brown on several branches and can be snapped off. Also a new hydrangea shrub has gotten the same brown leaf and seems to have died.

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on April 13, 2020
These articles discuss diseases of the plants that you are referencing.
https://www.gardeningknowhow.com/ornamental/trees/eucalyptus/eucalyptus-tree-problems.htm
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/common-hydrangea-diseases.htm
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