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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2022年59 No.5

Effects of simultaneous, or sequential, application of two different insecticides on the reproduction of Laodelphax striatellus
Author of the article:WANG Rui;ZHANG Xian;GE Lin-Quan;YANG Guo-Qin;WU Jin-Cai
Author's Workplace:College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225000, China;College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225000, China
Key Words:Laodelphax striatellus; jinggangmycin; carbendazim; triazophos; pesticide mixture; reproduction
Abstract:
[Objectives]  The purpose of this study was to investigate the effects of simultaneous, or sequential, application of two insecticides on the reproduction of the Grey planthopper, L. striatellus. [Methods]  Jinggangmycin inhibits reproduction in the Grey planthopper, whereas Carbendazim and Triazophos stimulate reproduction. Third instar nymphs sprayed with either Jinggangmycin & Carbendazim (JGM and CBM), Jinggangmycin followed by Carbendazim (JGM + CBM), Jinggangmycin and Triazophos (JGM and TZP), or Jinggangmycin followed by Triazophos (JGM + TZP). The interval between successive pesticide applications was 48 h. After adult eclosion, female fecundity, preoviposition period, oviposition duration, female lifespan, female weight, female body length, oviposition valve length, ovarian protein content and triglyceride content, were measured. [Results]  Compared to the control group, the female fecundity, oviposition duration, female lifespan, female body weight, ovipositor valve length, ovarian protein content and triglyceride content of the JGM and CBM group increased by 28.9%, 29.5%, 19.1%, 34.6%, 35.2%, 20.0% and 30.4%, respectively. There was, however, no significant difference in the pre- and post-oviposition body length of adult females. The JGM + CBM treatment group had significantly lower female fecundity, pre-oviposition period, oviposition duration, ovarian protein content and triglyceride content values than the control group (23.3%, 28.9%, 18.6%, 12.1% and 15.0%, respectively), but there was no significant difference in female longevity, female weight, female body length or oviposition valve length. The JGM and TZP treatment group had significantly lower female fecundity, female body weight, female body length, ovarian protein content, triglyceride content and a shorter pre-oviposition period (57.4%, 8.5%, 21.4%, 33.8%, 26.2% and 56.5%, respectively) than the control group. There was, however, no significant difference in oviposition duration, female longevity and ovipositor valve length. The JGM and TZP treatment group also had significantly lower female fecundity, oviposition duration, female body weight, female body length, ovipositor valve length, ovarian protein content, triglyceride content and pre-oviposition period values (19.6%, 32.6%, 7.2%, 14.8%, 7.6%, 31.5%, 36.8% and 79.7%, respectively) than the control group. There was, however, no significant difference in female life span. [Conclusion]  Spraying paired combinations of Jinggangmycin, Carbendazim and Triazophos, simultaneously or sequentially, had significant, different effects on reproductive parameters of the grey planthopper. These findings provide useful information for avoiding a resurgence of this pest following the application of different pesticides.
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