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Excerpt (1:18)
Forest Under Siege
1977
Insects can have either a direct or indirect role in the...
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Forest Under Siege
Excerpt  (1:18) 1977, production :
The film
Insects can have either a direct or indirect role in the damage to forest ecosystems. This excerpt shows how insect infestations can be averted through biological control. Care is needed to ensure that its use does not cause unwanted results.

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Two million six hundred square kilometers of forest are the feeding-grounds of armies of insects. This film shows the devastation, its causes, and the many ways in which the Canadian Forestry Service, with the help of the provincial governments, is fighting this vast attack.