Host handling behavior of the egg parasitoid Telenomus triptus to the egg mass of the stink bug Piezodorus hybneri |
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Authors: | H Higuchi and Y Suzuki |
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Institution: | (1) Kyushu National Agricultural Experiment Station, Nishigoshi, 861-11 Kumamoto, Japan |
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Abstract: | Host handling behavior of Telenomus triptus Nixon (Hymenoptera: Scelionidae) to an egg mass of Piezodorus hybneri Gmelin (Heteroptera: Pentatomidae) was studied in the laboratory. Five distinct behavioral events could be distinguished in the host handling behavior: drumming, ovipositor-insertion, marking, walking, and resting. Female wasps showed two types of behavioral sequence in an ovipositional bout. One consisted of drumming, ovipositor-insertion, and marking, and the other drumming, ovipositor-insertion, walking, and resting. Females did not seem to lay an egg when ovipositor-insertion was not followed by marking. This was observed frequently in the early oviposition bout, on average 2.9 times per female. Females finally succeeded in parasitizing all the eggs in a host egg mass in most cases. The durations of drumming, ovipositor-insertion, and marking on an egg mass were nearly constant, while the total time spent by a female on and beside a host egg mass varied considerably as a result of variable durations of walking and resting. Self-superparasitism occurred when almost all the eggs in a host egg mass were parasitized. Females laid the first male egg within the first four eggs; this could be an adaptation to small egg masses or single egg. |
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Keywords: | egg parasitoid Telenomus triptus stink bug Piezodorus hybneri parasitism host handling behavior soybean |
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