I NOTICED A SOAPY LIQUID SEEPING FROM PART OF OUR 12 YEAR WEEPING WILLOW. PLEASE ADVISE WHAT TO DO OR THE CHEMICAL WE SHOULD USE TO WASH THE SURFACE OF THE CRACK, TO PREVENT FURTHER EXPANSION OF THE DISEASE. THANKS
TREATMENT of WILLOW TREE
Certified GKH Gardening Expert
This sounds very much like Alcoholic Flux.
Here are some articles that will help you.