No abstract

No abstract

The efficiency of light traps for catching tortricids frequent in apple orchards dependent on construction and light colour. An improved light trap for catching some species of Tortricidae frequent in apple orchards is described. The optimal trap type is characterized by the following features of construction: vertical fluorescent tube, surrounded with a plastic net and flanked by two baffles; protected against raining by a shelter. The light colour is depending on the wanted moths. For trapping Adoxophyes reticulana, Archips rosanus, Carpocapsa pomonella, Cnephasia wahlbomiana, Olethreutes variegana, Pandemis heparana and P. ribeana UV‐fluorescent tubes are more suitable, while Archips podanus, Argyroploce umbrosana and Euxanthis hamana more respond to green light. The plastic net causes a selection of the catch. Contrary to many commonly used trap types which are catching an enormous quantity of insects besides of the moths wanted, using the improved light trap in some nights even more Tortricidae than other Lepidoptera are captured.

No abstract

Summary In this paper a rearing method for Dacnusa gracilis Nees is described. The imagines are cultured in screen covered cages supplied with honey and sugar for feeding and wet cotton wool for drinking. The eggs are laid only into dry Psila rosae eggs. After emerging the young Psila larvae are bred in the usual manner and they develop in the same time as the unparasitized larvae do. Through the puparium it is visible whether there is a Dacnusa or a Psila pupa in it, as soon as the eyes become coloured. Furthermore the form of the yellow body in the empty puparium is a sign for parasitism. The possibility of biological control against Psila rosae by Dacnusa gracilis is discussed.