Plastyczność instynktu larw Scolioneura betuleti Klug (Hymenoptera, Tenthredinidae)

Abstract

The larvae S. betuleti leaf-mine the lives of different species of birches (Betula spp.) and green alders (Alnus viridis Chaix). During the research on the biology of the larva stage of S.betuleti, the flexibility of the instinct of larvae was also studied regarding the possibilities of continuation of the development after transferring to the leaf- mine from the last stage formed by other species of the saw- fly in the leaf Betula pendula Roth, and Alnus glutinosa Gaertn. Before transferring the larva S.betuleti to the mine - the farmer inhabitant was removed. The larvae S.betuleti transferred to the top mines Fenusa pus ilia Lepeletier and Messa nana Klug in the leaves B.pendula carried on the feeding creating reversible mine. It was also similar to transferring to the mine Heterarthus vagans Fallen in the leaf A.glutinosa in the natural environment S.betuleti does not feed on this plant, only on A.viridis, in all experiments the larvae finished the feeding and abandoned the mines in order to transfer into the pupae. The experiments show the flexibility of the instinct of the larvae although their further fate is not known.