Rämert, Birgitta
- Department of Ecology and Crop Production Sciences, Swedish University of Agricultural Sciences
Abstract
Lygus spp. ( tarnished plant bugs) are generalist herbivores and occur as pests on a wide range of crops. In the development of conservation biological control strategies for Lygus spp. in Sweden, more information is needed on the impact of different natural enemies. In this study, we determined the occurrence and the degree of parasitism on adults and nymphs of the most common Lygus species in alfalfa, barley, red clover and oilseed rape in Uppsala in Central Sweden and in Umea in Northern Sweden. Nymphs and adults of Lygus spp. were collected by sweep netting for estimation of their parasitism level ( by dissection) and identification of parasitoid species ( from reared Lygus specimens). The dominant Lygus species in both locations was L. rugulipennis ( 75 - 99%). Parasitism by Phasia obesa ( Tachnidae) on overwintering Lygus adults was recorded in almost every field sampled at both locations. The parasitism level was low at overwintering sites but increased in arable fields during summer. Lygus nymphs collected in Umea were parasitised by Peristenus pallipes ( Braconidae) and in Uppsala by P. relictus, P. pallipes and P. varisae. The hyperparasite Mesochorus globulator ( Ichneumonidae) was recorded in Umea
Keywords
Lygus rugulipennis; Lygus pratensis; Lygus wagneri; Phasia obesa; Peristenus pallipes; P. varisae; P. relictus; Mesochorus globulator; native parasitoids; conservation biological control
Published in
Biocontrol Science and Technology
2005, volume: 15, number: 4, pages: 411-426
Publisher: TAYLOR & FRANCIS LTD
SLU Authors
Hellqvist, Sven
- Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences
- Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences
UKÄ Subject classification
Agricultural Science
Horticulture
Publication identifier
- DOI: https://doi.org/10.1080/09583150500086516
Permanent link to this page (URI)
https://res.slu.se/id/publ/6346