抄録
Two laboratory experiments were carried out to determine the length of time required and the frequency of one oviposition and one host-feeding by the female of Torymus (Syntomaspis) beneficus, a native parasitoid of the chestnut gall wasp. One oviposition took an average of 820 sec. Host-feeding behavior was observed twice in the second experiment, and took 3, 870 and 1, 300 sec, respectively. Construction of a feeding-tube for the host-feeding took 895 and 1, 025 sec, respectively. Time-allocation for each component of a behavioural series differed between experiments depending on the age of the parasitoid females and/or other factors. The females selected galls for oviposition at substage B and those at substage C, but were less interested in those at substage A. The rate of oviposition was 1.67 and 1.24 eggs per hour in the first and second experiments, respectively.
