Nakata, T., Sugiura, N., & Takagi, M. 2000 Host searching efficiency of Aphytis yanonensis and Coccobius fulvus (Hymenoptera: Aphelinidae), introduced parasitoids of Unaspis yanonensis (Homoptera: Diaspididae).. Science Bulletin of the Faculty of Agriculture, Kyushu University 55(1): 21-25.

Notes: Host searching efficiency of female adults of Aphytis yanonensis and Coccobius fulvus, introduced parasitoids of Unaspis yanonensis, was investigated in the laboratory, using mandarin orange (Citrus unshiu) leaf patches (4X4 cm) with host density of 1, 2, 4 and 8 per patch. We recorded host searching and oviposition behavior of individual female parasitoids until they left the patch. In the higher host density A. yanonensis females attacked more hosts than A. fulvus females when comparing the number of host attacked for 30 or 60 minutes after the patch entrance. This was because of the longer oviposition time per host attack in C. fulvus than in A. yanonensis. However, patch resident time of C. fulvus was longer than that of A. yanonensis, and no significant difference was detected in the number of hosts attacked and parasitized when compared to the per patch visit. It was suggested that the host searching efficiency per unit time was higher in A. yanonensis but that the host searching efficiency per patch visit was not different because C. fulvus stayed on the patch longer.