Fig. 5
From: Isoprene emission by poplar is not important for the feeding behaviour of poplar leaf beetles
Feeding choice of Chrysomela populi on isoprene emitting and non-emitting poplar trees. Feeding choice of adult C. populi beetles and larvae on isoprene emitting (IE) and non-emitting (NE) plants in the greenhouse. The mean infested leaf area from apex until lowest leaf and in total by adult C. populi beetles (mean +/− SE, n =20) (a) and the choices of beetles (b) in a cage with two IE (■) and two NE (□) trees over 48 h-period. The beetle choices are shown for hours (h) 0, 5, 2, 6, 24, 30 and 48. Bars represent the overall percentages of beetles choosing either of the odor sources; numbers in bars are the total numbers of beetles choosing that odor source; n.c., no choice. The feeding choice of larvae offered either IE (■) or NE (□) trees over 10 days was assessed by the infested leaf area (individual leaves from apex until lowest leaf and total leaf area) (c) at the end of experiment and the development (d) of the larvae by weighing them every 3rd day (mean ± SE; n: (c) = 8; (d) = 160 (beginning);121 ± 8 (3 days); 67 ± 1; (6 days); 33 ± 1 (10 days)). The infested leaf areas were analyzed from photographs by SigmaScan Pro5 computer program