Different growths are caused by different animals. Here's what it means if you see one of these on your oak tree ...

You could spot one or two, then dozens around the same tree. Oak galls are the result of gall wasps. Inside the galls are the ...

Leaves of endemic wiliwili riddled by Erythrina gall wasp damage are pictured on a tree on Kahoolawe in 2008. FOREST AND KIM STARR photo Reinforcements are being called to the front lines of a ...

Ambitiously, she constructed quantitative food webs for over 30 individual oak trees of varying isolation ... A citizen science project was conducted in 2007 to survey the oak gall wasps of Finland.

The invasive gall wasps were first discovered on Oahu in 2005. They spread quickly throughout the state and resulted in the death of thousands of Erythrina trees, including native wiliwili trees.