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Reel 1. A record of research carried out by the Imperial Forestry Institute, University of Oxford. Photographed for and presented to the Imperial Forestry Institute by British Instructional Films Ltd. Directed by Dr R. Neil Chrystal. Photographed by F. Percy Smith. Supervised by A.M. Field M.A. Sirex woodwasps lay their eggs in the wood of dying trees. The larvae burrow into the wood and render it useless for commercial purposes. C/U of woodwasp boring into wood. A male insect in C/U. Egg tunnel of woodwasp in section. C/U of egg. Young larva moving in the tunnel. Larva emerges from the wood through a hole it has munched. Larva tunnelling through the wood. C/U view of the larva’s head and legs. Pupa enters the pupal stage. Antennae, wings and legs are seen. Female pupa is removed for investigation. Seen in C/U. The changes in coloration of the pupa are shown through shots at different times in its life cycle. Insects make circular exit holes when they reach surface of wood. Insects e
