The overwintering physiology of the emerald ash borer, Agrilus planipennis fairmaire (coleoptera: buprestidae).
Ability to survive cold is an important factor in determining northern range limits of insects. The emerald ash borer (Agrilus planipennis) is an invasive beetle introduced from Asia that is causing extensive damage to ash trees in North America, but little is known about its cold tolerance. Herein, the cold tolerance strategy and mechanisms involved in the cold tolerance of the emerald ash borer were investigated, and seasonal changes in these mechanisms monitored. The majority of emerald ash borers survive winter as freeze-intolerant prepupae. In winter, A. planipennis prepupae have low supercooling points (approximately -30°C), which they achieve by accumulating high concentrations of glycerol (approximately 4M) in their body fluids and by the synthesis of antifreeze agents. Cuticular waxes reduce inoculation from external ice. This is the first comprehensive study of seasonal changes in cold tolerance in a buprestid beetle.
Department of Biology, The University of Western Ontario, London, Ontario, Canada N6A 5B7.
Jill C
JC
Crosthwaite
Stephanie
S
Sobek
D Barry
DB
Lyons
Mark A
MA
Bernards
Brent J
BJ
Sinclair
D000818:Animals; D021301:Antifreeze Proteins / Q000378:metabolism; D003080:Cold Temperature; D001517:Coleoptera / Q000254:growth & development / Q000502:physiology*; D031661:Fraxinus / Q000469:parasitology*; D005990:Glycerol / Q000378:metabolism; D019476:Insect Proteins / Q000378:metabolism; D010935:Plant Diseases / Q000469:parasitology*; D011679:Pupa / Q000254:growth & development / Q000502:physiology; D012621:Seasons
D021301:Antifreeze Proteins; D019476:Insect Proteins; D005990:Glycerol