Abstract
Fifth-instar brown marmorated stink bug (Halyomorpha halys Stål) nymphs were treated by gamma-radiation 60Co at different doses of 8-64 Gy to investigate their irradiation biology and potential for the sterile insect technique (SIT). At adult emergence, males were mated with non-irradiated virgin females to assess the longevity of both sexes, female fecundity, and egg sterility. Biological parameters of their F1 progeny were investigated to determine whether negative effects from parental exposure to radiation were inherited. Results showed that irradiation significantly reduced the lifespan of male insects at doses above 20 Gy. Irradiated males did not affect the longevity and fecundity of their female partners, nor of their resulting adult progenies, but it did reduce the developmental duration of nymphs as well as weight gain of male F1 offspring. Egg hatch was significantly reduced at all tested doses and reached complete sterility at 64 Gy. Low hatch of eggs produced by F1 or F1 crossed adults indicated that negative effects from radiation were inherited by the subsequent generation. But F1 male offspring were not less fertile than their irradiated male parent, unlike what was observed in Lepidoptera. The results support the potential for the use of SIT for H. halys management by irradiating the fifth-instar male nymphs at doses from 16 Gy to 64 Gy.
Highlights
The Brown Marmorated Stink Bug, BMSB (Halyomorpha halys Stål. 1855, Hemiptera: Pentatomidae), is a polyphagous invasive nuisance insect pest, which is considered native to China, Taiwan, Korea and Japan [1]
Male BMSB lifespan varied from 26.9 to 52.0 days depending on the radiation doses, while mean longevity was 66.8 days for the untreated controls
Male adult insects within 24h after moult were used for irradiation by Welsh et al (2017) [20], while slightly mature 1-2 week-old virgin and overwintering males of unknown age were investigated by Suckling et al (2019) [21]
Summary
The Brown Marmorated Stink Bug, BMSB (Halyomorpha halys Stål. 1855, Hemiptera: Pentatomidae), is a polyphagous invasive nuisance insect pest, which is considered native to China, Taiwan, Korea and Japan [1]. 1855, Hemiptera: Pentatomidae), is a polyphagous invasive nuisance insect pest, which is considered native to China, Taiwan, Korea and Japan [1]. Aggregation pheromones can be useful for BMSB surveillance [12], and pesticides are frequently used to control this insect pest species [13], but due to environmental issues, sustainable development problems including incompatibility with IPM programs and BMSB’s ability to tolerate a range of chemistries [14,15,16], chemical approaches for its measurement are not desirable. Some hemipteran species have been targeted for irradiation [19] but many aspects of the irradiation biology of Hemiptera are poorly developed and to our knowledge, there have been no field applications of hemipteran SIT
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