E. A. M. Beerling

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The use of biological control in Dutch glasshouses has increased tremendously in the second half of last century. Integrated pest management (IPM) is practiced on a large scale in all main vegetable crops. In glasshouse ornamentals IPM is more complicated, but at the end of last century biocontrol was applied in more than 10% of the area with ornamental(More)
Some butterfly species avoid egg-laying on plants which already bear conspecific eggs, and thus reduce food competition between their offspring. In twoPieris species the females produce in their accessory glands an oviposition-deterring pheromone (ODP), which is combined with the egg during oviposition. The ODP collected from eggs or accessory glands ofP.(More)
Eggs ofPieris rapae (L.) contain a water- and methanol-soluble oviposition-deterring pheromone (ODP) that is avoided by ovipositing females offered treated and untreated cabbage leaves in a choice situation. Water extracts of female accessory glands also deter oviposition. Egg washes and gland extracts stimulate a contact chemoreceptor in sensilla on the(More)
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