The balls taking space on the trees are eggs of Gall Wasps. Gall wasps are a small breed of wasps that lay their eggs in Oak and Pecan trees. Their eggs grow into the tree, leaving a hard capsule ...

Eggs of the parasitoid wasp can’t develop unless they are inside the Erythrina gall wasp, according to Lissa Fox Strohecker, Maui Invasive Species Committee spokeswoman. Studies indicate that ...