caa a22 4500 388036109 CHVBK 20180307125005.0 cr unu---uuuuu 161130e199804 xx s 000 0 eng 10.1017/S0007485300025736 doi S0007485300025736 pii (NATIONALLICENCE)cambridge-10.1017/S0007485300025736 Quantifying the impact of insect predators and parasitoids on populations of the apple ermine moth, Yponomeuta malinellus (Lepidoptera: Yponomeutidae), in Europe [Elektronische Daten] Life tables were developed to assess the significance of natural enemies on the dynamics of apple ermine moth, Yponomeuta malinellus Zeller, in southwestern Germany and to select parasitoid species for use in the biological control of this pest in Canada. During the study from 1993 to 1995 the abundance of Y. malinellus varied from 1.5 to 4.3 tents per 100 leaf clusters indicating that this was a non-outbreak population. From the life tables it was evident that the impact of egg predators accounted for 25-43% of the total generational mortality of Y. malinellus, more than any other known mortality factor. Percent parasitism varied from 18 to 30%, but the impact of parasitoids in relation to the total generational mortality of Y. malinellus from the life tables was remarkably constant at 11-14%. The loss of potential fecundity had an important influence on the generational mortality of Y. malinellus, but declined from 27% to 15% over the course of this study. This decline corresponded with a rise in the net rate of increase R0 from 1.35 in 1993 to 6.8 in 1995, despite the impact of insect predators and parasitoids on the generational mortality. Yponomeuta malinellus was attacked by five different obligate primary parasitoids, a single obligate hyperparasitoid, and three facultative hyperparasitoids. Of these, the oligophagous egg-larval parasitoid Ageniaspis fuscicollis Dalman (Encyrtidae) and the oligophagous larval-pupal and pupal parasitoid Herpestomus brunnicornis Gravenhorst (Ichneumonidae) were selected as potential biological control agents for Canada due to a minimal degree of interspecific competition. Copyright © Cambridge University Press 1998 Kuhlmann U. International Institute of Biological Control, European Station, 1, chemin des Grillons, CH-2800 Delémont, Switzerland Carl K.P. International Institute of Biological Control, European Station, 1, chemin des Grillons, CH-2800 Delémont, Switzerland Mills N.J. Center of Biological Control, University of California at Berkeley, USA Bulletin of Entomological Research Cambridge University Press 88/2(1998-04), 165-175 0007-4853 88:2<165 1998 88 BER https://doi.org/10.1017/S0007485300025736 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007485300025736 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kuhlmann U. International Institute of Biological Control, European Station, 1, chemin des Grillons, CH-2800 Delémont, Switzerland NATIONALLICENCE 700 1- Carl K.P. International Institute of Biological Control, European Station, 1, chemin des Grillons, CH-2800 Delémont, Switzerland NATIONALLICENCE 700 1- Mills N.J. Center of Biological Control, University of California at Berkeley, USA NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/2(1998-04), 165-175 0007-4853 88:2<165 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge