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Arthropods, 2017, 6(4): 117-125
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Article

Temperature dependent development parameters and population life table of beet armyworm, Spodoptera exigua (H¨¹bner) (Lepidoptera: Noctuidae)

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

Received 1 May 2017;Accepted 21 July 2017;Published 1 December 2017
IAEES

Abstract
Beet armyworm, Spodoptera exigua (H¨¹bner), is an important insect pest fed on many crops. Temperature and host plant dependent development, survival, and population parameters of S. exigua were studied in present article. The results showed that the generation duration of S. exigua at temperatures 20, 25, 27, 30, and 35 ¡æ were 37.61, 30.78, 22.40, 18.57, and 13.74 days, respectively. S. exigua could not survive at 38 ¡æ. The generation duration of S. exigua, feeding on Lactuca sativa, Lactuca Sativa L., Raphanus sativus L., and Allium fistulosum at 27 ¡æ, were 18.86, 20.10, 22.67, and 22.50 days respectively. And the generation survivorship was 30.91, 29.00, 22.00, and 27.50% respectively, far less than observed 81.91% feeding on artificial diet. S. exigua feeding on L. sativa showed the highest net reproduction rate (216.29), intrinsic rate for increase (0.34), population trend index (76.59), finite rate for increase (1.33), and fecundity (606.5 eggs), while these values were the lowest when it fed on A. fistulosum. Relationship between development rate and temperature was fitted with three models, the linear model, Logistic model and Wang model, and Wang model produced the best fitting goodness. Wang model showed that for the egg, the 1st-5th instar larvae, pupa and adult of S. exigua, the upper limit temperatures for development are 45, 44.5, 44.4, 40.3, 43.6, 38.9, 38, and 38 ¡æ, resepctively; the lower limit temperatures for development are 7.5, 7.2, 13.4, 7.3, 6.6, 5.3, 5.6, and 5.6 ¡æ, respectively, and the optimum temperatures for development are 21.9, 28.9, 25.5, 24.5, 26, 31.6, 30.6, and 29.1 ¡æ, respectively. The upper limit, lower limit and optimum temperatures for development of the entire generation are 38, 5.7 and 30 ¡æ, resepctively.

Keywords Spodoptera exigua;life table;population parameters;temperature;development;host plants.


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