VOLUME LOSS OF PULPWOOD IN MANITOBA CAUSED BY WOOD BORERS

Abstract

Measurements were made of the volume losses caused by wood borers in jack pine and black spruce pulpwood exposed to attack during the summer of 1956 in Manitoba. The average number of borer holes per square foot of log surface was 4.8 in jack pine and 6.5 in black spruce. Losses due to surface feeding and tunnelling were low and seldom exceeded 1.5 per cent of the volume of sample logs. These losses would not have offset the cost of chemical control. Cerambycid larvae accounted for most of the volume loss. Losses caused by buprestids were insignificant.