The wheat-stem sawfly, one of the most destructive of grain pests, is being outwitted by the research scientists of the Canadian Department of Agriculture. This film shows how sawflies bore the stems of wheat until only a hollow, weak stalk remains, easily broken by wind. A recent control measure--the development of solid-stemmed strains of wheat on which the sawfly has little effect--is described.
1960, 04 min 55 s
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