The population growth, development and metabolic enzymes of the white-backed planthopper, Sogatella furcifera (Hemiptera: Delphacidae) under the sublethal dose of triflumezopyrim

Abstract

Triflumezopyrim, a new nicotinic acetylcholine receptor (nAChR) inhibition, can effectively control piercing-sucking insect pests such as white-backed planthopper (Sogatella furcifera). At present, there has been no reports on the effects of triflumezopyrim on the population growth and development of S. furcifera. In this experiment, an age-stage two-sex life table was used to evaluate the impact of triflumezopyrim on the biological parameters of S. furcifera. The results showed that the adult preoviposition period (APOP) and total preoviposition period (TPOP) of the F₁ generation were significantly higher than those of the F₀ and F₄ generations, on the contrary the average fecundity, intrinsic rate of increase (r) and finite rate of increase (λ) of the F₄ generation were higher than those of the F₀ and F₁ generations. The results of synergists and enzyme activities indicated that the CarE and P450 activities in the F₄ generation were significantly higher than those in the F₀ generation (P < 0.05). The protein contents of vitellogenin (Vg) and vitellogenin receptor (VgR) and relative expression quality of VgR in the F₄ female adults were also significantly higher than those in the F₀ generation (P < 0.05). These results showed that triflumezopyrim at a low concentration could promote the growth and reproduction of S. furcifera, and that may provide a reference for the rational use of triflumezopyrim in the future.

Keywords: Age-stage two-sex life table; Enzyme activity; Sogatella furcifera; Sublethal effects; Triflumezopyrim; Vitellogenin and vitellogenin receptor.