2014 Volume 39 Issue 2 Pages 98-104
We investigated permethrin effects on female adults of Nilaparvata lugens using a line with long wings, which initiated ovarian development one day after adult emergence. Vitellogenin gene (Vg) expression was significantly enhanced in the adults 1 day after topical application of 10 ng or more of permethrin per individual at 0-day-old adulthood. Similar triggering action of the expression was observed by application of juvenile hormone (JH) III, but such actions were blocked by application together with precocene II, an antagonist of the JH. Enhanced Vg expression and earlier oviposition were found in adults of the next generation when adults of the preceding generation were treated with permethrin. These results strongly indicate that permethrin functions initially to induce JH III synthesis in adults before initiating ovarian development in the females, which triggers Vg expression, finally rendering the treated adults with earlier oviposition, even of the next generation, relating to resurgence.
