A farm in Southern NJ is experiencing an infestation of the granulate ambrosia beetle, Xylosandrus crassiusculus (Mot.). GAB was identified by expert Dr. James Lashomb at Rutgers. Adults are hunch-backed in appearance and are cinnamon or brownish in color. Females are 2.1-2.9mm in length and males are 1.5mm. Offspring are small white and legless c-shaped larvae.
Females bore into trunks or limbs and excavate a system of tunnels in the wood. The beetles feed on living trees and carry a mutualistic fungus with them. When GAB females attack a tree, they introduce the fungus, which also is used as a food source. Eggs, larvae, and pupae are found together in galleries. There are related ambrosia beetles that attack apple and are present in other states and it is possible we have multiple species.