caa a22 4500 388093358 CHVBK 20180307125257.0 cr unu---uuuuu 161130e199906 xx s 000 0 eng 10.4039/Ent131373-3 doi S0008347X00009986 pii (NATIONALLICENCE)cambridge-10.4039/Ent131373-3 RELATIONSHIP BETWEEN FOLIAR CHEMISTRY AND SUSCEPTIBILITY OF NORWAY SPRUCE (PINACEAE) TO PRISTIPHORA ABIETINA (HYMENOPTERA: TENTHREDINIDAE) [Elektronische Daten] Following a 3-year period of high populations of the little spruce sawfly, Pristiphora abietina Christ, a monophagous species infesting Norway spruce, Picea abies Karst., we compared variations in foliar nutrients (nitrogen, water, soluble carbohydrates, starch) and potential defensive compounds (fiber, quinic and shikimic acids, tannins) of trees that had been subjected to high or very low levels of defoliation. During the time of needle expansion a substantial decline in leaf quality occurred: nitrogen, water, and carbohydrate levels decreased, whereas fiber and starch concentrations increased. Allelochemicals such as tannins and organic acids, however, peaked at bud break and then rapidly declined. More heavily attacked trees had higher nitrogen, water, and fiber contents but lower starch and organic acid concentrations than lightly attacked trees. The needle tannin content was significantly lower in heavily attacked trees throughout the period of larval feeding. Needle tannin levels and the nitrogen to tannin ratios seem to be the most probable traits to distinguish sawfly-resistant from sawfly-susceptible Norway spruce trees. Copyright © Entomological Society of Canada 1999 Schafellner Christa Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria Berger Roland Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria Dermutz Arno Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria Führer Erwin Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria Mattanovich Jutta Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria The Canadian Entomologist Cambridge University Press 131/3(1999-06), 373-385 0008-347X 131:3<373 1999 131 TCE https://doi.org/10.4039/Ent131373-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131373-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schafellner Christa Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria NATIONALLICENCE 700 1- Berger Roland Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria NATIONALLICENCE 700 1- Dermutz Arno Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria NATIONALLICENCE 700 1- Führer Erwin Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria NATIONALLICENCE 700 1- Mattanovich Jutta Institute of Forest Entomology, Forest Pathology and Forest Protection, University of Agricultural Sciences, HasenauerstraBe 38, A-1190 Vienna, Austria NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/3(1999-06), 373-385 0008-347X 131:3<373 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge