Abstract
SummaryAn apparatus ‐ named as “Dosierungs‐Trommel” (dose‐drum) ‐ is described which makes it possible to spout a defined amount of parasitized eggs of Sitotroga cerealella (Oliv.) containing pupae of Trichogramma embryophagum Hartig (var. cacoeciae Marchal) and unparasitized eggs of Anagasta kuehniella (L.) to the crowns of apple trees. The release of Trichogramma from 16 containers fastened to outer branches of apple trees resulted in a slightly higher percentage parasitism of artificially distributed host eggs (Sitotroga cerealella [Oliv.]) on test cards than the release of the same amount from one or four containers in more central positions. Host eggs (A. kuehniella) sprayed to the crown together with pupae of T. embryophagum increased the percentage parasitism by this parasite on test cards. A high dosage of T. embryophagum gave remarkably better results when sprayed upon the leaves than when released from two typs of containers on the trunk. Further confirmation of these results will be needed.
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