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Arthropods, 2018, 7(1): 26-30
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Article

A quantitative study on development, fecundity and mortality of beet armyworm, Spodoptera exigua (Hubner) (Lepidoptera: Noctuidae), infected by SeMNPV

HongQing Dai, WenJun Zhang
School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China

Received 1 June 2017;Accepted 15 August 2017;Published 1 March 2018
IAEES

Abstract
Beet armyworm, Spodoptera exigua (Hubner), is an important pest for many crops. SeMNPV infected development, survival process, and population parameters of S. exigua were studied in present study. The results demonstated that relationship beween probit value of mortality (y) and the logarimic of SeMNPV concentration (x) followed the linear equation: y=0.455+0.9300x. At 27 cels. degree, the LC50 of the third-instar larvae of S. exigua was tested to be 77082 PIBs/ml. Pupa weight (y; mg) of S. exigua decreased significantly with the SeMNPV concentration (x; SeMNPV concentration (PIBs/ml)): y=106.038-1.1962 log(x) (r²=0.915, p=0.044). Fecundity (y; eggs/female) of S. exigua decreased significantly with the SeMNPV concentration: y=690.523-28.5209 log(x) (r²=0.997, p=0.001). Both net reproduction rate (R₀) and population trend index (I) decreased with the SeMNPV concentration (x): R₀=744.121-54.6707 log(x) (r²=0.983, p=0.009); I=354.259-24.4705log(x) (r²=0.987, p=0.006).

Keywords Spodoptera exigua;SeMNPV;infection;development;survival;fecundity;pupa.

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