QuestionsHow to growTrees and ShrubsPests and DiseasesWeeping Willow Tree 0 Vote Up Vote Down Elizabeth Mulvihill asked 15 years ago I have a weeping willow tree which is five years old and is doing very well except for the fact that there are caterpillars in it. How do I get rid of them and also there are bumps on some of the leaves. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Caterpillars will feed for a few weeks then disappear to pupate. The damage is insignificant and the tree will recover.