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Chelonus formosanus is an important parasitic natural enemy of Noctuidae pests in Lepidoptera. In order to clarify the effects of different treatment of antennae on the behavioral response of C. formosanus, and the number of sensilla in antennae, the effects of antennae-excision of C. formosanus on the search for the honey sources and hosts, the longevity of the male and female wasps, the parasitism rate of the female wasps and the hatching rate of the host offspring were investigated, and the number of antennae receptors in different treatments was compared by using the scanning electron microscopy (SEM). The search time for honey sources of both the male and female wasps was the fastest when 1/3 of the flagella was removed, (79.59±23.22)s for female wasps and (106.52±26.71)s for male wasps. The search time for hosts of the female wasps was the fastest in the control group (204.38±24.01)s. However, no host could be found by wasps in the treatment groups with all antennae and all flagellum excised. In addition, compared with the control groups, the longevity of male and female wasps, the parasitism rate of female wasp, and the hatching rate of offspring were not significantly different under the different proportions of antennae excision. The SEM results showed that there were significant differences in the sensilla trichodea, the sensilla placodea, the sensilla basiconica, and the sensilla squamiformia between the different excision treatments. The results indicate that higher proportion of antennae removed would lead to greater impact on the search for honey source and host, indicating antennal sensilla played an important role in the search, localization and parasitism behaviors of C. formosanus.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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