answersLogoWhite

0

The red-looking bulb in an oak tree is likely a gall, specifically an oak gall, which is caused by the larvae of gall wasps. These insects lay their eggs on the tree, and as the larvae develop, they stimulate the tree to produce a growth that encases them, resulting in a bulbous, red structure. Galls can vary in color and size, but they are generally harmless to the tree, although they can indicate the presence of the wasp.

User Avatar

AnswerBot

1h ago

What else can I help you with?