Ovicidal activity of juvenile hormone mimics in the bean bug,Riptortus pedestris |
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| Authors: | Shouya Naruse Mayuko Ogino Takao Nakagawa Yoko Yasuno Akiya Jouraku Takahiro Shiotsuki Tetsuro Shinada Ken Miura Chieka Minakuchi |
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| Institution: | 1.Applied Entomology Laboratory, Graduate School of Bio-Agricultural Sciences, Nagoya University, Furocho, Chikusa, Nagoya 464–8601, Japan;2.Graduate School of Science, Osaka City University, Osaka 558–8585, Japan;3.National Agriculture and Food Research Organization, Tsukuba 305–8634, Japan;4.Faculty of Life and Environmental Science, Shimane University, Matsue 690–8504, Japan |
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| Abstract: | Insect juvenile hormone (JH) mimics (JHMs) are known to have ovicidal effects if applied to adult females or eggs. Here, we examined the effects of exogenous JHMs on embryonic development of the bean bug, Riptortus pedestris. The expression profiles of JH early response genes and JH biosynthetic enzymes indicated that JH titer was low for the first 3 days of the egg stage and increased thereafter. Application of JH III skipped bisepoxide (JHSB3) or JHM on Day 0 eggs when JH titer was low caused reduced hatchability, and the embryos mainly arrested in mid- or late embryonic stage. Application of JHMs on Day 5 eggs also resulted in an arrest, but this was less effective compared with Day 0 treatment. Interestingly, ovicidal activity of synthetic JHMs was much lower than that of JHSB3. This study will contribute to developing novel insecticides that are selective among insect species. |
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| Keywords: | methoprene pyriproxyfen embryo juvenile hormone III skipped bisepoxide |
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