The Effect of Exposure of Hibernation Sites on the Time of Trypodendron Spring Flight

Abstract

Prebble and Graham (1957) reported that initial flights of the ambrosia beetle, Trypodendron lineatum (Oliv.), occur from late March to early May depending on the time of rapid rise in maximum daily temperature. Flight and attack activity was investigated near Cowichan Lake, B.C., by Chapman and Kinghorn (1958). They concluded that the first heavy attack flights could be expected when the air temperature rose above 60°F. (15.6°C.) after most of the snow had melted. The amount of snow cover and altitude were found to affect time of flight.