caa a22 4500 469098589 CHVBK 20180323133038.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF00317699 doi (NATIONALLICENCE)springer-10.1007/BF00317699 Comparison of insect, fungal, and mechanically induced defoliation of larch: effects on plant productivity and subsequent host susceptibility [Elektronische Daten] [Steven Krause, Kenneth Raffa] Summary: Larch sawfly, Pristiphora erichsonii Hartig, and larch needlecast fungus, Mycosphaerella laricinia (R. Hartig) Neg., are early season defoliators restricted only to Larix host trees. Larch defoliation (100%) by either the fungus or insect, but not mechanical removal, induced systemic responses that reduced sawfly consumption and digestion rates one year later. In a feeding behavior assay, larvae quickly abandoned seedlings previously defoliated by M. laricinia. Adult female oviposition choice and egg deposition were unaffected. Seedling growth was not affected during the year of defoliation by M. laricinia, but was significantly reduced one year later. Defoliation by M. laricinia reduced stem volume, radial growth, root biomass and new shoot production. The latter tissue is the only oviposition resource for larch sawfly, and, in contrast, is not influenced by sawfly feeding. We hypothesize that M. laricinia infection may limit larch sawfly populations where both species coexist. However, this reduction is at a substantial net cost to larch productivity. Springer-Verlag, 1992 Larix decidua nationallicence Mycosphaerella laricinia nationallicence Pristiphora erichsonii nationallicence Carbon allocation nationallicence Krause Steven Department of Entomology, University of Wisconsin, 53706, Madison, WI, USA aut Raffa Kenneth Department of Entomology, University of Wisconsin, 53706, Madison, WI, USA aut Oecologia Springer-Verlag 90/3(1992-06-01), 411-416 0029-8549 90:3<411 1992 90 442 https://doi.org/10.1007/BF00317699 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317699 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krause Steven Department of Entomology, University of Wisconsin, 53706, Madison, WI, USA aut NATIONALLICENCE 700 1- Raffa Kenneth Department of Entomology, University of Wisconsin, 53706, Madison, WI, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 90/3(1992-06-01), 411-416 0029-8549 90:3<411 1992 90 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer