Without a picture, and even then, it is hard to diagnose plant problems. If the droppings are very small and round, it may be caterpillar excrement. If it is more like sap or a constance oozing from the tree, slime flux or bacterial wetwood is possible. Contact an arborist or your local Extension Service for treatment advise. Here is an article on wetwood: https://www.gardeningknowhow.com/ornamental/trees/tgen/wetwood-bleeding-trees.htm. Here is the homepage for Texas' Extension; search for wetwood or slime flux. https://agrilifeextension.tamu.edu/browse/featured-solutions/gardening-landscaping/
Answered on September 30, 2019
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