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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comOver half of the branches are bare of leaves. the plant is definitely not thriving.
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[1] https://www.gardeningknowhow.com/ornamental/trees/desert-willow/caring-for-desert-willow-trees.htm: https://www.gardeningknowhow.com/ornamental/trees/desert-willow/caring-for-desert-willow-trees.htm
[2] https://plantclinic.tamu.edu/: https://plantclinic.tamu.edu/
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1 Comment To "Why is my desert Willow losing all of its leaves? The leaves have brown spots on them."
#1 Comment By drtreelove On 08/11/2018 @ 10:15 pm
I would suspect that your heat/drought conditions and appropriate deep watering should be your first consideration.
https://www.gardeningknowhow.com/ornamental/trees/desert-willow/caring-for-desert-willow-trees.htm [1]
Desert willow trees are know to be relatively resistant to pests and diseases, but there are some possibilities for disorders:
Invertebrates:
Aphids
Diseases:
Verticillium wilt
Environmental disorders:
Mineral deficiencies
Nutrient and mineral excesses
Poor water management
Weeds
Vertebrates: gophers
It is not possible for us to give a definitive diagnosis without more information on growing conditons and management. You may need a site visit from a local consulting arborist or university extension service advisor.
https://plantclinic.tamu.edu/ [2]