ambrosia beetle

from The Century Dictionary.

• noun Any one of a group of beetles of the family Scolytidæ, which burrow in the wood of different trees, and in their burrows cultivate certain fungi known as ambrosia. See ambrosia, 3. Thirty species belonging to 6 genera in the United States are known to have this habit.

from the GNU version of the Collaborative International Dictionary of English.

• (Zoöl.) A bark beetle that makes and feeds on ambrosia{4}.