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New possibilities to fight pests with biological means

en released the same scents that have been observed in corn. To test whether these scents do attract the parasitic wasps, these plants were tested in an olfactometer, a device to study insect behaviour.

The researchers placed scent-producing as well as unmodified plants in the six arms of the olfactometer. When the predatory wasps were set free in the central cylinder of the olfactometer, they flew towards the scent-producing plants. The experiments led to an additional, surprising result: in order to react this way, the wasps needed a first exposure to both the corn scent and the caterpillar which led them to associate the two. Young, "naive" wasps without this experience could not distinguish between scent-producing plants and control plants, or failed to move at all.


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Source:Max-Planck-Gesellschaft


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