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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...
Effects of predators on the dispersion of pea aphid (Acyrthosiphon pisum [Harr.]). The action of the larvae of the predator Syrphus corollae Fabr. frequently resulted in a fall‐down‐reaction of pea aphids (A. pisum Harr.) in under glas experiments. Starting from some infested plants the aphids...
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