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Brown leaves

Many dead brown leaves hanging on the twigs often indicate foliage died suddenly (photo). Foliage that dies over a longer period of time (months) often drops from the tree as the tree forms abscission layers at the base of the petioles. Sudden death could be caused by factors above ground or below ground.

Below ground factors to look for include

Brown foliage

Above ground factors could include

Brown leaves

Except for fire blight and some other diseases, insects and diseases usually do not cause this type of symptom.

See: Click here for insect, pest and disease diagnosis.