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Hardiness Zone: 6b
Isap from New York, NY
Short of cutting it down, which I don't recommend, you can't stop a pine tree (or any species of tree) from dripping sap. Several internal and external forces, including internal water levels, time of the year, air temperature, disease and physical damage suffered by the tree, regulate sap flow in trees. Sap flow is simply the tree response to any one of a number of natural processes. If the sap is seeping from an area that was recently pruned, it will stop eventually. If the needles or tops of the tree look brown, dripping sap may be a sign that the tree is in trouble. I would suggest calling in a professional arborist to diagnose the problem.
If sap is dripping onto your car, I've heard of people using mayonnaise or butter to dissolve sap on car paint without hurting the finish. I can't swear that it works because I've never personally tried it. Still, it might be worth researching.
Ellen
About The Author: Ellen Brown is our Green Living and Gardening Expert. Click here to ask Ellen a question! Ellen Brown is an environmental writer and photographer and the owner of Sustainable Media, an environmental media company that specializes in helping businesses and organizations promote eco-friendly products and services. Contact her on the web at http://www.sustainable-media.com
Cut it down. Sorry to say it seems to be the only way I know. Your extension or farm agent tied up with your state could give you a professional answer or correct mine if I am wrong.