The ambrosia beetle, Gnathotrichus retusus (Coleoptera: Scolytidae) breeding in red alder, Alnus rubra (Betulaceae)
Brood adult ambrosia beetles recovered from well established galleries in a windthrown red alder, Alnus rubra Bongard, on Burnaby Mountain, Burnaby, British Columbia, were identified as Gnathotrichus retusus LeConte. The tree was attacked to a height of 25.8 m. Galleries penetrated up to 17.5 cm into the wood. The mean density of gallery entrance holes (± SE) was 120 ± 31.9 per m2 of the bark surface. The mean production of brood in five completely dissected galleries was 13.2 ± 5.5. These results show conclusively that C. relusus in British Columbia can breed successfully in an angiosperm host.
Key Words: Gnathotrichus retusus; Alnus rubra; ambrosia beetle
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