Zur Nahrungsqualität von Fichtennadeln für forstliche Schadinsekten

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Abstract
Problems of influencing insect populations by changing the food quality. In forest entomology, as opposed to plant and livestock breeding it is not possible at the present stage to make use of changes in food quality as a routine technique for influencing insect populations. Although noticeable reactions of insects to changes in food quality have been known for a long time research on this matter has not yet reached a stage far beyond a first tentative screening. A careful elaboration of these questions is suggested to master the forthcoming problems like the cultures of clones of spruce trees or fertilizing of forest trees.