Answer: While it's possible your tree has developed gummosis, bordeaux spray (lime sulphur) should not be sprayed on the leaves; they will burn. Bordeaux is typically used during the dormant season on deciduous trees, not on evergreens such as your lime tree. Without seeing the problem I can only share information of a general nature. Phytophthora gummosis, a fungal disease, causes sap to ooz from small cracks in the trunk. Lesions spread around circumference of trunk, girdling tree. Decline may occur rapidly or occur over several years. To control, excise the diseased bark and paint with copper.
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