The gummosis disease of citrus which is caused by Phytophthora palmivora is identified by observing

The gummosis disease of citrus which is caused by Phytophthora palmivora is identified by observing Oozing of gum.
An early symptom of Phytophthora gummosis is sap oozing from small cracks in the infected bark, giving the tree a bleeding appearance.
The gumming may be washed off during heavy rain. The bark stays firm, dries, and eventually cracks and sloughs off.
This disease is commonly seen in mandarin, sweet orange, lemons and other citrus fruits.