Giant palm borer— Dinapate wrighti
Palm borer adults are large, brown to black beetles. Larvae are stout and yellowish and live within palm trunks, taking several years to reach maturity. Adults are up to 2 inches long.
Adults and larvae tunnel into wood leaving large holes about 1/2 inch in diameter. Fronds turn yellow and plants may die. Plant tissue may contain tunnels or boring insects. Weakened trees may fall over in the wind. Both Phoenix and Washington palms are attacked. The giant palm borer is probably a secondary pest attacking dead and dying plants.
Provide good growing conditions and proper cultural care. Dispose of dead palms in which beetles breed.